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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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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Pitch control for cassette players

Figured I might as well post this stripboard layout that I did for the cassette player speed mod. It is based on a drawing from the old Casper Electronics website. Only requires a small piece of stripboard (4×6 ) and 5 components. There are other ways to affect the speed of a tape player motor … Read more

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PT2399 Noise Ensemble delay

The Noise Ensemble is an extremely noisy delay that can easily be pushed over the edge into self-oscillation. Based around the PT2399 IC; it has a built-in VCO, 2 op-amps, and 2 low pass filters crammed into a 16 pin dip case! It can get very loud! Check out the datasheet. I have built more … Read more

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Circuit Bend a Toysmith Megaphone Voice Changer

Here is a handy diagram for circuit bending a Toysmith Megaphone Voice Changer. There are a couple more mods you can do to this bad boy but the ones pictured are the key to getting sound in and out via jacks, as well as pitch and feedback loop. These are really versatile in the studio … Read more

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8 Monotron Delays and 8 Sequencers in one box

FROM 2012 : This is a project I started a few months back for a friend who is looking to sequence 8 Korg Monotrons for live performance… once the Monotron Delays get delivered I will most likely follow the great advice, directions, and tips at Steve Woodward’s site, he has compiled most of what is … Read more

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Opto-Oscillator LFO based on the 40106 IC

CD40106 opto LFO

Super simple OPTO LFO for a friend who was looking to design his own enclosure based around some kind of electronic noise toy. Here is an even simpler drawing of the schematic. (I mistakenly called the glass insulator I used to diffuse the light and inductor, too many beers before filming). Share this content

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The Revenger!

Revenger circuit with body contacts and pitch

I made this out of stuff from my junk box/pile. The main circuit is from a Radio Shack desktop toy called “The Revenger”, complete with Laser, Machine Gun, & Bomb sound effects. I may have to record another video using the Dub Box Delay so you can hear the true LoFi reggae glory. Simple pitch … Read more

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Finished another couple of Power Starve Pedals

power starve pedal

 I like to call them power sag pedals but from what I have been hearing and now reading the correct term is Power Starve or Voltage Starve.. Dying Battery Simulator is still acceptable. Anywho.. 2 more have been built and shipped off to Hollywood where they will no doubt become the star of the pedalboard … Read more

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