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Showing posts sorted by date for query http://belltonesynthworks.com. Sort by relevance Show all posts

Thursday, April 15, 2021

Yamaha CS-80 Synthesizer Sound Selection Circuit Analysis


video by Bell Tone Synth Works

"I had the idea to do some videos breaking down how specific circuits or sections from different vintage synths work in step-by-step detail, and here's my first one, about how preset, memory, and panel sound selection works in the notorious/legendary Yamaha CS-80.

This video is meant to be more 'educational' than 'fun' and if you personally don't think it's fun (or musical) enough, that's OK!
It also requires at least a basic understanding of a few key electronics theory concepts to follow.

If you'd like to read a written version of this explanation and look at the diagrams/schematics in more detail, you can find it on our blog here: http://www.belltonesynthworks.com/202...​"
You can find additional posts featuring Bell Tone Synth Works here.

Friday, May 08, 2020

Restoring TWO Sequential Circuits Prophet 10 synths and stacking them with MIDI (40 Oscillators)!


Published on May 8, 2020 Bell Tone Synth Works

"The techs at Bell Tone Synth Works vintage synth repair workshop recently restored TWO amazing Sequential Circuits Prophet 10s and since we also retrofitted both with MIDI, we decided to chain them together to create a 20-voice, 40-oscillator monster polysynth! Here's an overview of what goes into restoring one of them, and a demonstration of the 'Prophet 20' in action, also featuring our lovely Hawk HE-2150 stereo tape echo. This is like playing FOUR Prophet 5s at the same time!

Sound demonstration starts at 6:42
(in case you don't care about the 'tech stuff')

Bell Tone Synth Works is an electronic musical instrument repair workshop in Philadelphia, PA specializing in restoration and repair of vintage synthesizers and organs.

Website: http://belltonesynthworks.com

Video by Alison and Stout and Darian Scatton, May 2020.

Sunday, April 05, 2020

"The Organ Machine" combo organ CV interface and how it works (ADCs and multiplexers!)


Published on Apr 5, 2020

"The interface circuits we designed and built for 'The Organ Machine' allow a vintage combo organ or other instrument with a divide-down architecture to be controlled with control voltage sequencers, with a separate CV input for each octave. Each octave of the organ is used as the core of a separate synthesizer voice after being fed through the envelopes and filters of a Music From Outer Space modular synth and Buchla clone low pass gates. In this video, Darian demos the instrument and Alison explains how it works, with an explanation of what ADCs (analog to digital converters) and multiplexers do.

This isn't the kind of thing we usually do, but we thought it might be fun to share this weird DIY project while everyone's at home because of the Coronavirus!

Bell Tone Synth Works is a electronic musical instrument repair workshop in Philadelphia, PA specializing in restoration repair of vintage synthesizers and organs.

Website: http://belltonesynthworks.com"

Wednesday, November 29, 2017

Paul McCartney demonstrates the Mellotron


Published on Aug 31, 2016 MotorMouthMusic

And a recent video from Bell Tone Synth Works

Inside a Mellotron M400: How the Mellotron Works

Published on Nov 27, 2017

"Here's a look inside a Mellotron M400 we just restored and an explanation of how it works! The famous (or notorious) Mellotron M400, made in the 1970s, is a unique keyboard instrument in which every key plays back a recording of that note on actual magnetic tape.

This Mellotron (#1344) was restored by Alison Stout at Bell Tone Synth Works in Philadelphia, PA. Read more about this and other vintage keyboard restorations on our blog at http://belltonesynthworks.com!"

Saturday, July 08, 2017

Moog Werkstatt modded with built In Synthrotek echo module


Published on Jul 7, 2017 Bell Tone Synth Works

"Here's a little demo video of a Moog Werkstott custom mod project we did. The main attraction is a built-in echo module with patchable CV modulation. It's also got a volume knob, a gate input jack (this needs a little transistor circuit in order to work), and separate 1/8" outputs for the pulse and square waveforms. The first half shows the Korg sequencer triggering the envelope generator through the new gate input jack, and then gradually adding echo. The second half shows one of my favorite ways to use it-- pushing the echo processor until it starts to feed back and then manipulating the harmonics using the Feedback and Delay Time knobs while the synth plays a PWM drone.
Visit http://belltonesynthworks.com to learn more. Get in touch and we'll help you dream up some cool mods for your synth!"
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