North Coast News

Ribbet!
2017 Nov 12th

Ribbet!

The Leapfrog VCF does not actually go "ribbet," at least not without some effort. But after being told by one friend I showed it to that most people don't want to make real music with their modulars but just want something that goes "uuuuuuuuuuuLAAA…

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Preferred values for resistors and capacitors
2017 Oct 29th

Preferred values for resistors and capacitors

You've probably noticed that although resistors and capacitors come in many different values, some of which seem like they could be randomly chosen, there's nonetheless some sort of logic to it. You'll see power-of-ten sizes like 1kΩ, 10kΩ, 100kΩ an…

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Temperature compensation with NTC thermistors
2017 Oct 22nd

Temperature compensation with NTC thermistors

The panel contractor says they dispatched the first production batch of MSK 007 Leapfrog VCF panels to me on Friday, and those are the last remaining physical items needed before I can launch the module; so I'm still hopeful that I can ai…

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The Celebrated Leaping Frog
2017 Oct 15th

The Celebrated Leaping Frog

I've spent most of this week working on the second and third prototypes for the Leapfrog VCF. I'm hoping to have this product available for sale by the end of the month - maybe in time to have some kind of spooky Halloween tie-in for the launc…

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Circuit board shopping
2017 Sep 10th

Circuit board shopping

This week I'm planning to order the prototype boards for the Leapfrog Filter, and it makes a good opportunity to go through some common questions beginners ask about shopping for PCBs. When you go to buy PCB production services you're typically hit w…

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Video picks
2017 Sep 3rd

Video picks

I've been busy this week dusting off the design for the Leapfrog Filter. I really did most of the work on it back in 2016, and I even built a prototype which works pretty well, as you can hear in audio demos like this one. I'm hoping that will tran…

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Understanding stabilization capacitors
2017 Aug 27th

Understanding stabilization capacitors

Here's a simplification of the output driver circuit from the MSK 008 Dual VC Octave Switch. It's a familiar inverting op amp circuit with gain of -1. The op amp's positive input is tied to 0V; it will act to force its negative input to also s…

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Free EDA software rundown
2017 Aug 20th

Free EDA software rundown

The MSK 008 Octave Switch is planned to launch tomorrow and I've already posted the manual; so I thought it would be fun for this week's Web log entry to introduce some of the software tools I use for producing, and especially for documenting, module…

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