Sound Urchin videos

POTAR Design Devices Super Sound Urchin in orange with orange decal

The Sound Urchin is an electro-acoustic instrument that creates off-kilter sounds, atmospheres, and ambiance based on vibration. The entire instrument acts like a pickup and will amplify just about anything it sits on. It can be plucked, strummed, thumped, and “played” in many ways. You are only limited by your own imagination. What are other … Read more

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Stereo phono preamp using JAN 6418 tubes

Here is a nice little stereo phono preamp using a pair of JAN 6418 subminiature tubes. This design uses very few components and adds a nice bit of extra oomph and tube tone sparkle to your input signal. I have tested on turntables and cassette decks with great results. Using an IC7660s as a charge … Read more

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Modified DOD FX70 Stereo Flanger

DOD stereo flanger mods

I have had this old DOD Flanger kicking around in my parts box for about 10 years. I finally got around to testing the mods on it, and WOW! It’s a killer. From added LFO tones and noise to delay-like repeats The mods are pretty simple, you replace the 3 internal trim pots with comparable-value … Read more

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CV Hex Noiser

Here is a fun little noise project that you can hook up to your Baby 8 Sequencer to get some gnarly sounds. Taking CV (control voltage) from your sequencer or another synth the POTAR CV Hex Noiser creates funky noise beats, bleeps, and squelches in time with your setup. Don’t have a sequencer? No problem, … Read more

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Sub Mini Tube Booster with the JAN 6418

Here is a stripboard layout I did for a preamp/boost using the JAN 6418 subminiature tubes I have been experimenting with lately. It is based on the schematic from the previous post, but rather than powering the heater with a 1.25-volt battery, I utilized an LM317 voltage regulator and a 100-ohm resistor. This ultra-simple circuit … Read more

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Low Power Vacuum Tube PreAmp

I have wanted to learn more about vacuum tubes for years but was always put off by the extremely deadly power requirements. Working with low power sources for so long, I have blown my fair share of capacitors, which is scary enough for me. Recently I discovered the world of sub-miniature vacuum tubes and the … Read more

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Germanium Fuzz using MP16b PNP transistors

The perfect layout for using the MP16b transistors that I have been importing from Russia. This layout is based on the Sabro Fuzz Face layout. I moved the bias from inside to the top so you can go from scuzzy velcro to full-on fuzz. I also dropped a line from the vero that was unused. … Read more

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