A little while ago while having a bit of a sort out I came face to face with the extent of my backlog of projects! So, I’ve been on a bit of a mission to make a bit of a dent in it.
Here’s my progress so far… (part 1)!

Multi Voice Changer Megaphone

This was an easy one. It’s a cheap and cheerful kids toy I was given as a gift at some point which makes a pretty great noise. Years ago I started experimenting with putting a jack in the side to take a signal straight out for recording purposes. To this end I knocked up a simple opamp gain stage to boost the signal to a better level.

The unit originally worked by a basic trigger switch connecting power to the unit every time you wanted to speak into it. This generated a pretty load pop so I installed a switch for the power and a good quality pushbutton switch to switch on the microphone when you wanted to talk into it. It still pops a little but not that load and I quite like it!

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drum on a breadboard

drum on a breadboard
A drum on a breadboard

So, I’m currently enjoying a few days off work and have got some time to play.

This was originally meant to be a short post to update all that’s been happening here in the lab. As it turns out that’s quite a lot so apologies for the slightly epic length of the post. You may want to get a drink and a few snacks before you go any further.

What have I been up to you may wonder?

Well on Sunday like any other attic dwelling mad inventor I’ve come up with a drum circuit. Initially I started by putting another circuit I’d found together on a breadboard and promptly blew up the chip it was based around. Sadly there was no explosions or even a puff of smoke. It just ceased to do anything at all.Read more »

dronesynth with TRG-1

The wiring is done on the voice board and I’ve fired her up to see how she sounds. As the modulation board isn’t installed yet I’ve hooked the TRG-1 up as a modulation source to test how everything works.

dronesynth with TRG-1
dronesynth with TRG-1

There’s a few issues to iron out, the output of the oscillators needs the level increasing and the control voltage sources will need a bit of fine tuning but it all works.
Have spent most of the day playing with it and I’m very happy with what I can do with it. By it’s very nature learning to play the thing will be a series of happy accidents. You just keep tweaking the controls till it sounds nice.
I’ve made a couple of recording of my play. All synth sounds are the dronesynth and all recordings are live.
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After much faffing with far to many components I’ve finished the circuits used to control the VCF (Voltage Controlled Filter) of my Juno.

Here are a few samples with the TRG-1 being triggered from my TR-707 drum machine and taking a control input from my Expression pedal. The TRG-1 is then providing the Trigger and VCF Control signals to the Juno 6.Read more »