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Common parts to keep in stock


One of the most common beginner SDIY questions is which parts are frequently used and worth buying in large quantities to use on multiple projects.  The people who ask this question think they're going to save serious amounts of money by buying common parts in bulk, and although I have serious misgivings about the money-saving aspect, the question isn't going to stop being asked, and there are in fact other reasons why keeping a stock of parts may be a good idea.  Here are some thoughts on that.

Fiddly details

I've already written a lengthy rant on The vanity of "Having A Lot Of Parts" and although it bears repetition, I'll only briefly summarize here.  Some parts, like maybe fixed resistors, really are commonly used and likely to turn up in many projects.  But those parts are cheap anyway.  They cost just a small fraction of the total price tag of a project.  Most of the real cost of building any given project will be in parts that you cannot reasonably stockpile because there are just too many fiddly details to them.  If you're building someone else's designs, and especially if you're using circuit boards someone else laid out, then you run into problems like that illustrated in the following picture.

two trimpots that barely differ from each other

Two Bourns multiturn trim pots; 3296W-series on the left and 3296Y-series on the right.  Multiturn trim pots in general are frequently used parts that you'd need for many different projects and might want to buy in bulk and keep a stockpile.  Can you even see the difference between the two photos?  It may not be obvious at first glance...

The footprint, or arrangement of pins on the bottom where they plug into the board, is different between the two series.  There are actually several other footprints available too.  These two are the most common; but they're both common.  A given board that calls for multiturn trimmer pots will probably call for one of them, but there's no consistency as to which one.  If you have a circuit board designed for one footprint and you try to plug in the other, it won't fit.  (It's technically possible to design a board that could take either, but that's not a common practice because it means crowding out space that could be needed for other things, creating problems routing the board.)  If you stockpiled one series of multiturn trim pots and you want to build a project whose board was designed for the other, too bad; you're stuck buying new trim pots of the other type and you can't use the ones in your stockpile.  And this is a costly mistake to make because those little trimmers cost over $3 each if you get the name brand in small quantities; less if you're getting the Thai knockoffs, but they're still going to outweigh the cost of things like fixed resistors where it's easier to get away with keeping a stockpile.

As long as you're building from others' designs, you're going to constantly run into this kind of issue.  The really common parts are never the expensive ones.  The real money that goes into building an electronic project is in parts that have these kinds of fiddly detail issues to them killing the idea of stockpiling to save money.  Similar issues contribute to why "PCB and panel" is usually a bad idea.

You have to synthesize

However, that stuff is a problem when you're building from others' designs.  Things change a lot if you aren't.  You can both save money and make things more convenient for yourself by keeping a stock of "common" parts if you're in a position to do your own designs, or at least to modify existing designs to suit the parts you have.  You can arrange to make the parts you have genuinely "common" if you take a hand in the design process.  As Kompressor says, You Have To Synthesize - by which I mean, create your own designs.

Suppose everybody who used multiturn trimmers like those shown in the photo agreed to use the 3296Y-series footprint.  Then you could just stock those and be sure they would work.  Problem solved, right?

You'll never be able to convince everyone designing modules in the world today to standardize on a single footprint, and even if you could you can't go back in time and convince all the designers of the past to do their designs with the standard parts you want to settle on today.  But within a controlled environment, like your own lab, you can easily enforce this kind of standardization.  I actually do get away with buying multiturn trimmers in quantity and Saving Money by keeping a parts inventory, because I'm only building North Coast modules and I have decreed that all North Coast modules will be designed for the 3296Y-style footprint; the same trimmers go into a Leapfrog VCF and a Dual Octave Switch.  I similarly use only a couple different styles of jack sockets, a couple of form factors of panel potentiometers, usually 5.08mm-spacing film capacitors, and so on.  You can do the same if you're doing your own designs.

It's not even necessary to do entirely new designs yourself.  You can work from a schematic you got off the Net and do your own layout to use the parts you have, whether it's for a full etched PCB, a stripboard or perfboard, or something dodgy with point-to-point wiring.  As you get more advanced with the electrical side, you can even get into stuff like substituting values of parts.  Replace a 100k pot with a 50k pot because that's what you have?  Will that work?  Usually... so you have to learn how to answer that question, but once you know, it means you can make better use of parts you have on hand.

Thus, despite my disparaging remarks about people trying to "save money" with stockpiled or salvaged parts, it is possible to do it... as long as you're willing to dig a little deeper into creating and modifying designs.  You just can't get good results stockpiling parts for completely ready-made designs.  Looking at a complete kit, like the ones I happen to sell, and saying "I want to buy just part of that and save money by already having the other components" is a fool's errand.

Common values

There is another reason to keep an inventory of parts, and it's especially relevant when you're getting into design and experimentation.  Quite often when you're playing with a new circuit, you want to try different values for something.  This came up for instance with the Transistor ADSR - it has a resistor in the input which sets the voltage level at which the envelope will trigger, and the first value I chose for that turned out not to give the results I wanted.  I had to try a couple more before settling on the final choice, and I was only able to do that because I had all the values I wanted to try, in stock.  It went a lot better than my development of the Fixed Sine Bank, where I needed to try several different values of Zener diodes to set the output level, I didn't have a selection of them in stock, and I ended up having to make many small orders from distributors to get different Zener values until I found the right one.  When you're doing development of new designs, it's really valuable to have a selection of different values of components in stock.

I'll say once more:  this is NOT a way to save money on regular builds of pre-existing designs!  It's a way to save effort on development of original designs.  You want to have a few of many different values on hand so that at any time when you want to try a given value, you'll be able to put your finger on that value without rushing off to buy it.  You save money, maybe, on buying quantities a little greater than your immediate needs, but you'll probably lose more on buying parts that you won't actually use.  You are paying for convenience - but the convenience is worth paying for when you're doing design work.

Take a look at my article on preferred values for resistors and capacitors.  Those series of numbers provide a good guide to useful values of these components.  If you get, say, all the E24 values in a range, then you'll know that for any value you might want in that range, you'll have a part with a nominal value within about 5% of your desired value, and that's usually close enough.  In practice, you often want to choose parts from the shorter lists.  I keep a stock of E24 resistor values but I usually design with E12 values when I can; that means there are that many fewer values I'm likely to end up needing to buy in larger quantities.  For capacitors I aim for E6 or even E3 values.  At the extreme, the power-of-ten values (1k, 10k, 100k, 1M) are so popular it may actually make sense that someone could "save money" by stocking up on them even for others' designs.


With resistors in particular, there are a lot of commercially-available kits on the market that provide a few (maybe 10, maybe 20, maybe 100, you have choices depending how much you want to spend) of all the values in some E-number series and a given range.  If you're looking to set up a lab for doing experimental designs, it makes a lot of sense to get one of these because they're often priced much lower than what you'd spend buying small quantities of many values one at a time.  Just be aware that you will inevitably end up getting some values you are unlikely to use, try not to waste too much money on those, and think carefully about which kit you want.

I kickstarted my lab a few years ago with a kit that contained 100 each of all the E24 values from 10 ohms up to 1M, in 1% metal film 1/4W through-hole.  That has served me pretty well.  However, as is common with metal-film resistor kits, it goes further down into the low end and not as far into the high end as I'd really like.  In synth DIY, it's rare to use any resistor values below about 1k except maybe for the occasional LED or output current limiting resistor.  I expect that many of the values between 10 ohms and 1k (two full decades) will never be used in my lifetime.  Meanwhile, I do sometimes want resistor values above 1M, for things like high-frequency trim in oscillators, frequency-setting resistors in LFOs, and so on, and the kit just doesn't cover that range.  (Very few kits do.)  I've had to supplement it by buying additional resistor values in the beyond-1M range.  So my ideal lab kit, which I don't think anybody is selling, would actually go from 100 ohms to 10M.

There are those who would claim that it doesn't make sense to buy 1% resistors in E24 values; the E24 series is really intended for 5% resistors and 1% resistors in E24 values end up giving uneven coverage with gaps between the values.  My thinking, however, is that I'm really treating these as higher-quality 5% resistors.  For decades the standard was 5% carbon-film resistors.  In most circuits, when you calculate a value you want, that's about how close you have to hit it to get the circuit to work.  Having tighter tolerance, so that the circuit is more predictable, is really nice, and in this day and age, at hobbyist quantity levels, 1% resistors don't really cost much more anyway and it's worth having them.  But it's not really necessary to keep a stock of very many more values (going to E96 for best coverage of 1% resistor ranges would quadruple the size of the kit) just for the rare cases when I need to hit a calculated value more precisely during development.  It's also a fact that I don't want to be designing with E96 values any more than necessary, at all - they're much harder to source as single values when it comes time to buy larger quantities for production.  And if I do ever try to misuse my inventory as a cost-saver for building others' designs, well, others also design with E24 (usually E12) values and my chances are better with those.


I like to have decent stocks of smallish electrolytic capacitors for power supply filtering: 10µF and maybe 22µF, rated for the full Eurorack power voltage (in practice this usually means 35V, as the next level comfortably past 24V for +-12V power supplies; it would cover the +-15V of other formats too, though just barely).  I also use many 0.1µF axial ceramic capacitors for bypassing ICs; usually two of those (one on each power rail) for every DIP IC, which is slightly overkill but better than having too few.  I wouldn't invest in a range of power-filtering capacitors because the cases where you really need other sizes than these are rare enough it makes sense to wait and buy caps specifically for those cases when they come up.  I avoid putting audio through electrolytic capacitors, but if you are willing to do that you may want some electrolytics in this range or a little larger (maybe 33µF and 100µF) for AC-coupling signals.

For op amp compensation:  I don't keep all of these in stock but it might make sense to keep the E6 values from 10pF to 100pF (in addition to those two, the series would be 15pF, 22pF, 33pF, 47pF, and 68pF) in disc ceramic or MLCC; disc ceramic is cheaper if you can find it, but they're falling out of use.  Among those you can find most of the compensation capacitors you're likely to want for synthesizers.  Capacitor kits, like the resistor kits, do exist but they're likely to cover a lot of values you're unlikely to use for audio.

For capacitors in a synthesizer that are really used for audio (filtering, VCO integrators, and so on) it makes a lot of sense to use polyester film.  I've standardized on 5.08mm (0.2 inch) lead spacing in my own designs; it's convenient for breadboarding, doesn't take up a lot of space on the PCBs, and most capacitor values are available in that spacing.  As with the ceramic caps, there are capacitor kits available.  I use a lot of the E3 series from 0.1µF to 1.0µF (that is 0.1µF, 0.22µF, 0.47µF, 1.0µF) but that's partly because I'm building Fixed Sine Banks which use these relatively large film capacitors.  Other audio applications often use smaller values, like from a few hundred pF on up.  This is a wide enough range, and the applications are specialized enough and the actual capacitors expensive enough, that I would hesitate to buy a range of values in advance, and would just buy them piecemeal when I had a specific application in mind.  Unless you can get a really good deal on a "kit" there's just too much likelihood of waste.


I don't think it makes much sense to stockpile potentiometers unless you're really confident of being able to redesign things to fit your inventory.  There's just too much that can go wrong with the physical design, and pots are expensive, so it's really a shame to buy a bunch of a specific type of pot and then find it won't fit in the place you want to put it and you have to spend a bunch more money on other pots that are very similar to the ones you already bought but can't use.

Nonetheless, if you want to live dangerously and you accept that You Have To Synthesize:  100k linear and audio taper are the most common panel pots.  Pick a manufacturer and series according to your quality and price preferences and design your circuits around that.  Very many circuits use or can be adapted to use 100k panel pots.  Other power-of-ten values (10k and 1M in particular) are also nice to have for occasional situations where 100k won't do.

For trimmer pots you may need more distinct values.  The main thing, as I mentioned earlier, is to pick a consistent PCB footprint.  I really like the Bourns 3296Y-series footprint:  it doesn't take up too much board space; it fits on breadboards and prototyping PCBs with 0.1 inch grid holes; I think having the pins in a triangle instead of a line makes for a slightly stronger, more rigid assembly; and there are many options both cheap and expensive for trim pots fitting this footprint from different manufacturers.

Discrete semiconductors

The 1N4148 diode is ubiquitous.  It probably makes sense to grab a thousand of those.  Note that projects calling for 1N914 diodes can use 1N4148; the only difference in specification is that the 1N4148 has a lower maximum amount of noise allowed, so any diode that meets the 1N4148 spec also meets the 1N914 spec.  I also use a lot of 1N5818 Schottky diodes.  These are appropriate for reverse-voltage protection on Eurorack power supply connections and can often substitute for the other kinds of protective circuitry that other designers like to use.

You need basic NPN and PNP silicon transistors.  The most popular ones are 2N3904 and 2N3906 and these are reasonable choices for general-purpose use.  In my own designs I've more or less standardized on 2N5088 and PN200A, which are higher-gain types.  A few places the higher gain is useful; I just use these ones across the board because it's convenient to have only a couple of transistors that I use almost everywhere.  One of the secrets of modern discrete BJT design is that the specific transistors you use hardly matter anymore, especially at audio frequencies; and in the occasional cases where they do matter, you're going to be buying transistors specific to your project instead of taking them from generic stock anyway.

Despite mentioning above that I ran into a situation where I wished I had a range of Zener diodes to try, I would not actually recommend trying to stock such a selection. They're uncommon enough that most will go unused and you're probably better off just buying specific values as needed.  Similarly with other kinds of discrete semiconductors, like JFETs.

Integrated circuits

The TL074 quad op amp is ubiquitous in synthesizers and it makes sense to keep those on hand.  Maybe also TL072 (dual instead of quad version of the same thing).  It probably doesn't make much sense to stockpile any other op amp types - in the cases where you need something else, your needs will be specific enough that you'll probably need to buy specifically for your project.  At one point I bought a bunch of bipolar-input MC33079 quad op amps thinking I would use them for higher-quality audio applications and then found that because of the input impedance requirements of synth modules, I had very few chances to actually do that.  Similarly, I keep a stock of 555 timers for general hobby electronics, but rarely use them in synths in particular.

The standard VCA chips are the LM13700 (as about the only operational transconductance amplifier still on the market in through-hole form) and various manufacturers' successors to and clones of the discontinued SSM2164.  It may make sense to stock these for synthesizer experimentation.

I have several times seen a recommendation to keep on hand voltage regulator chips, in particular the 78L05, but I'm not sure how useful that really is.  I guess it depends on the kinds of designs you do; if regulating the +12V rail down to +5V to supply digital circuits, or sensitive analog circuits that need an isolated power supply, is something you do a whole lot, then you may use a lot of 78L05s, but if you're in that position you would know.  I used the 78L09 for similar purposes in the Leapfrog VCF but haven't found another reason to keep a stock of that chip recently.  I do use a lot of TL431 regulator/references in different designs of my own, but I'm not sure anyone else does; it's a matter of taste.

For the most part, I think you should expect to be choosing and buying new chips for each design you do.

As a related issue, assuming you're doing through-hole, it makes sense to stock IC sockets, and that introduces the next item.


Jack sockets to put on the panel for patching.  I use Lumberg 1502 03 vertical sockets (similar to the popular Thonkiconn) for boards parallel to the panel, and CUI MJ-3536 right-angle sockets for boards perpendicular to the panel.  These, or anyway some kind of jack sockets of your choice, are probably worth stocking.

Header connectors for plugging boards into each other:  you can get breakaway single-row male headers that snap to the desired length, and in principle there are female sockets that are also break-away style, but I prefer to just stock 10- and 12-pin lengths and use as many of those as necessary.  Double-row headers are also worth having for Eurorack power connections.

Toggle switches

Toggle switches are expensive and it may or may not make sense to stock them, but if you do, it certainly makes sense to standardize on a particular line.  I like the E-Switch 100-series of miniature toggle switches.  Many cheap toggle switches have the same dimensions as these; I've even had good luck ordering no-name versions from Tayda and finding that their unspecified dimensions were compatible with the E-Switch version.  I keep stocks of the SPDT three-position (centre is no connection) and DPDT two-position types, because these are the ones used in my current products, but I expect that in the future I'll end up stocking one or two others for use in other designs.


I worry a lot about newbies who think they are going to "save money" by keeping a stock of parts to build third-party designs; that doesn't really work.  But it does make some sense to keep an inventory if you will be experimenting with original designs, or if you are willing to cultivate the skill of modifying existing designs to use the parts you have on hand.  It works better, in particular, when you are building from a schematic instead of from a full physical and PCB design.  I've gone through some of the kinds of parts and value ranges where keeping a stock of commonly-used parts is most likely to be successful.  I had originally planned for this entry to also include some notes on storage and organization, but it has gotten quite long, so I think I'll leave that for some future entry.

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Hi Matthew,

very nice article! I mostly agree with you. On some minor points I want to share my opinion, maybe as an addition. As this is about common parts, I think this will not bring in some confusion, at least I hope so...

= there will be light =

TL;DR 5mm LEDs

If you like to use LEDs on frontpanels to indicate e.g. frequency, you could stockpile them. 5mm housing is most common for hobby I think and easy to mount (just put in 5mm hole). It is common practice to not mix batches, as one red will not be as bright like the other red. Just keep them in the bags they are delivered and use all from one bag for one module. I saw some design using multicolor LEDs, dont stockpile those, they are to specific.

= there is not just one OpAmp =

TL;DR look for "jellybean" OpAmps. Dont bother about "the perfect" OpAmp, this is not cutting edge technology. TL074 is fine, LM358 is also common (but "not so good")

(This part may be a bit too specific for people who decided to not even think of doing their own mods or designs, but I think as OpAmps are the most used building blocks in analog circuits and synths, one should read about them enought to master the basics.)

Its true that you often see TL074 (quad; TL084 is similar, much like 1N4148 and 1N914). There are other "jellybean" / "general-purpose" OpAmps out there, most notably maybe LM358 / LM2902 (dual, quad) and MC1458/RC4558 (dual)/uA741. All of these are "from the old days" = 70ties, compared to 21st-centuries ICs there specifications are antique. (the uA741 is only manufactured because people think its popular and therefore must be good. Think for yourself, its from 1968 and technology has advanced...) With my humble experience there no big difference in performace for these jellybean amps for "uncritical" applications (think of LFOs) in DIY and synths. No one can seriously bother about "precision" in SDIY. But note that the TL074 are JFET-input (high input impedance) which is critical for some designs, not for all. But hey, we want to build audio machines for (mostly) fun, not even radio stuff, so specifications are for the real geeks out there. Not to mention measuring devices or space/military... Never stockpile single amps, always dual or quad in a package and silence leftovers. They cost more or less the same. Most of them have the "industry-standard" pinout, if you use sockets (you should!), you can even swap them with ease. The interested reader may watch (EEVblog #1436). If you want to experiment, you can get a handful of some "uncommon" amps, just to play around. But never buy OpAmps which your local dealer or favourite supplier has for sale or so, stick with jellybeans. (Unless you want some lucky bag like experience).

= why no logic ICs mentioned ? =

TL;DR CD40106 could be useful (schmitt-trigger, build simple oscillators)

Maybe there is a specific branch of SDIYers who love to use simple logic chips (not microcontrollers, nothing programmable, just most basic building blocks). I think you can get fast and reliable progress when playing with these, which is nice for beginners.

CD40106 (schmitt-trigger) based cores are the most popular simple oscillators I would say. (This single-transistor reverse avalanche oscillator stuff was a youtube hype in my opinion, they are not reliable and need some skill to make them work as "expected".)

Dont touch the 74xx series, they run at 5V ( Eurorack mostly is +-12V, even if the most popular power connectors take care of 5V (which is used for logic ICs).

If you want to keep some logic ICs watch for 40xx (CMOS, CD40xx, manufacturer specific coding, They can run from 3-4V up to 18V, so using them in a +-12V or +-15V system on a single rail is fine. There are even quite powerful 40xx chips, e.g. the 4046 phase-locked-loop, I also like the 4060 (oscillator + counter, have some fun with even harmonic squarewaves). They come sometimes with B (buffered) or UB (unbuffered) at the end of the numbering. Some designs need to use the UB types in a more analog way to put it simple (mostly CD4069UB). I would treat them as special parts, because from some vendors you dont get the info if its B or UB which may be a disaster when ordering a lot at once.

Ok, to be honest, except from the CD40106, using logic ICs a lot in synths may be a niche. Wow, look at the logic noise series by Elliot Williams

= doing a hobby is more like a craft than industry scale production =

TL;DR kits ok, (unavoidable?) unused trash, as the article says someday you can buy "dear old friends" in larger quantities perfboard is easy for small designs (begginer friendly). Do not get extra PCBs maybe you can keep some frontpanel parts (pots, jacks) if your not finicy with your panels

I got most of my basic parts from kits or "kits" (aka lucky bags aka junkboxes). For me, with an electrical engineering background, this is a little bit joyful on its own. But I would not recommend it for everybody. As stated by Matthew, a good fraction of all the values I will never use. After about 3/4 year I was able to say "hey, I'm low on xxx and sure I will use 20/50/100/??? in the future" when ordering specific stuff.

But how should you be so confident when just starting? I remember ordering the 1N4148 in quantities of 10, 20 and at some point I realized I need more. Using up to 20 in one design isnt that uncommon, so lets see how long 200 or so will last. And than I can think of something like 1000. Same for 20k resistors and so on. In scematics or BOMs I read them like "ah hello again dear old friend" standart xxx. Do not bother to much in the beginning about quantities. If you realize that SDIY is your thing, than you can get over a handfull of bucks you paid "too much" for your first 100 pieces of common parts.

Be aware that you are likely to spend more in total if you start your hobby with the mindset of starting an industry-scale buisness. If you would, you should never touch THT components or even discrete transistors anyways...

Think of SDIY more like an art or craft. The other extreme would be to do everything on perfboard / stripboard. Keep some of it, as it is fast and fun for small design. Experiment which you like most, so starting with 1-3 sheets each is fine. You can cut larger sheets with a utility knife or similar. Online (mostly in forums) you can get layouts for some very popular modules.

But for larger designs its very painful to debug your placing, soldering and routing. Manufacturing your own PCBs (e.g. etching) is nothing to start with as you need extra equipment. Its not uncommon, some people share the masks as pictures online. Getting a PCB manufactured by a company is also not as straight forward and there is the discussion about quantities again. Do you seriously need 10x the same PCB? Thanks to people who sell full DIY kits, but also plain PCBs. And a very great thanks at this point to people like Matthew from North Coast Synthesis for sharing gerber files! This makes it a way more easier to get to PCBs where its hard to find a retailer. (... I hope its totally clear that its complete nonsense to have some PCBs in reserve. Get more than one if you want to build a module more than once. Thats it.)

Actually I stockpiled pots, I have a box full of bags of them. Thats because I had the opportunity to get 8 values at once very cheap so I took a lot x 8 values. Same as with kits mentioned earlier, its unlikely that I will use 2k pots. I pondered and researched what I would pay from other sources, so this was the best option. A very important point here was that I do not rely on any physical design because my panels are handmade. I use metal sheets or plywood and drill the holes with a cordless electric drill. This process is so inaccurate that I need to wire the pots to the board anyways, so their footprint doesnt matter to me.

Same for jacks, but I think there is a not so big zoo of different dimensions, maybe similar to the switches.
i9e1 - 2022-01-11
ups, very long minor points... thanks to the TL;DR (should actually be placed as bullet points, never mind)
i9e1 - 2022-01-11
Matthew and i9e1 - Thank you BOTH greatly for posting your excellent thoughts on this issue! :D I've kept stock of many things since starting DIYing my own modular synth in 1992. I started working at an electronics wholesaler in April that year and THAT were why I started buying my parts from there! I quickly realized how handy it would be to buy the E24 values of the resistors (5%s if not mistaken) by 100 and the 100k, by the 1,000's a few years later. On and off through the years I am finally down to my final 100 of the 100k resistors, this year. (1998 to 2005 break from building, though.)

As per i9e1's commentary on the LM358's not being the greatest - I've stuck with them for tighter CV value requirements as our formal wonderful supplier Ray Wilson (R.I.P. sir. Missing your modules / designs, greatly.) - he said the 358's have a very low offset, for summing / et cetera. So I've stuck with them for that, for the last few years. LM324 quads for general LFO stuff (which I've just built a few more of FINALLY, last month. I don't like using my VCLFOs and VCADs as non-VC LFOs.)

Also CMOS? :D I played in the Lunetta / noise area for about 10 years. Many great thanks to Jazz drummer / instructor / inventor great, Stanley Lunetta, for that. (R.I.P. as well, sir. :( ) CD40106; 4015; 4051,2 and 3 are my faves. I like the 4046 as well and hope to be finding MY PCB layout for it up at electro-music, for Thomas Henry's VCO on it. Lost mine here.

Babbling ... thanks again both! Great reading! Peace, Ryk - Kitchener (innovenvator of the Liquid HiHat module - 2007. Later sold by hexInverter Electronique.)
Ryk Thekreator - 2022-08-04
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