North Coast News

Driving LEDs digitally
2019 Apr 15th

Driving LEDs digitally

In the last entry I described the electrical requirements of LEDs and how to drive them in the context of analog circuitry. When you want to indicate information with the brightness level of a single LED, as in my Transistor ADSR where the LED dir…

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LEDs and analog drivers for them
2019 Apr 8th

LEDs and analog drivers for them

Light-emitting diodes! They're all over our electronic equipment; but what are they all about, really? The underlying concepts are simple, but there are a lot of frequently-asked questions that show there's confusion among hobbyists about how…

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Building a telephone ring booster
2019 Mar 22nd

Building a telephone ring booster

I recently switched to a new cable Internet modem, because the cable company (which provides my home Internet service) assured me that the package that came with the new modem would be cheaper for the same service compared to what I'd been payi…

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Exponential converters and how they work
2018 Oct 12th

Exponential converters and how they work

Exponential converters are basic building blocks used in many synth circuits, but for many of us, they are incomprehensible black boxes.  The basic concept of how an exponential converter works is very simple; but the simplest possible circui…

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Level up on circuit simplification
2018 Sep 22nd

Level up on circuit simplification

In my last entry I talked about the rules for simplifying series and parallel circuits. Two resistors in series can be replaced by one with a value equivalent to the pair of them; two in parallel can similarly be replaced; there are other rules…

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Combining components for new values
2018 Sep 19th

Combining components for new values

When I started breadboarding the Coiler VCF (see my new videos about it...), I ran into a problem: the design called for a couple of 6800pF (also known as 6.8nF) capacitors, and I didn't have any of those on hand. I didn't want to rush out and…

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Common parts to keep in stock
2018 Aug 23rd

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 buyi…

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The vanity of "Having A Lot Of Parts"
2018 Jul 30th

The vanity of "Having A Lot Of Parts"

It is often said that the secret of Taco Bell's success is that they only use six ingredients:  refried beans, seasoned ground beef mixture, cheddar cheese, sour cream, lettuce, and corn tortillas.  Everything on their menu is just some…

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Transistors for the Perplexed
2018 Jul 8th

Transistors for the Perplexed

Most transistor circuits are quite straightforward.  If you look at the schematic of something like the North Coast Transistor Mixer, you can easily recognize common patterns - an emitter follower here, a common-emitter amplifier there - w…

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Tools for getting started with SDIY
2018 Jun 26th

Tools for getting started with SDIY

Visit the North Coast Synthesis SDIY page!It's a fairly common question "What tools do I need to get started with synthesizer do-it-yourself building?" and most people who ask or answer this question seem to think it starts and ends with a soldering…

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