Stomp box synthesizer

[Brian McNamara] fed the output of his guitar pedal back into its input creating a looped synthesizer. He started with an effects pedal he made but now we think he’s ended up with an electronic¬†stomp box. Check out the results in the video after the break. Now he needs to make the knobs foot-friendly so he can monkey with this while playing guitar.

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Looping foot pedal

This guitar pedal can record, playback, and modify samples. [Colin Merkel], also know for his work on electronic door locks, built this to replicate some guitar effects he heard in recordings. By tapping the button at the bottom with your foot the device begins recording. Another tap stops the recording and starts the loop. That’s where the rest of the controls take over, with settings to adjust the speed of playback, volume, and the type of playback looping. The video after the break gives a great demonstration of these features.

[Colin] built this around a PIC 18F877A with a 256k RAM chip to store the sample. There’s a bunch of other components that go into this and we’re dumbfounded that he built it on protoboard. This would be a multi-breadboard prototype for us and we wouldn’t think twice about laying out and etching our own PCB. He admits that the point-to-point soldering stretched his skills to the limit but he doesn’t say how many hours it took to get the circuit up and running. This is a great addition to the cool guitar pedals we’ve seen here.

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Melloman tape-looping keyboard

[Michael] tipped us off about an incredible build from back in 2005. The Melloman is a keyboard that uses a different tape loop for each key. The instrument is generally known as a Mellotron, and consists of a different looping tape for each key. When a key is depressed, the head comes into contact with the key and plays the sound sample.

This particular implementation uses 14 Walkmans to supply the tape loops. The Walkman units are constantly playing but the audio output is not enabled until a key is depressed. The main description of the instrument is on the final project page linked above but there are many construction photos available in the build log.

Update: After the break we’ve embedded a video that will take you on a tour of the components of the Melloman. To clear up the looping issue: a Mellotron uses tape loops, but the Melloman uses tapes that are 30 minutes on each side instead of loops.

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