"SotD" - Straight Off The Datasheet.
Whilst this isn't strictly true, it's fair to say that this doesn't stray too far from the echo application on the PT2399 datasheet. Due to a screwup on my part, this module can be used to create either the traditional echo effect or face-shredding feedback.
Basically, what I've done is gone through a few different PT2399 schematics and chopped and changed them to simplify things and this is the result. There are two control: one for repeat time and the other for feedback. If you want dubby echoes then turn both all the way up, whilst if you want to pass the plain signal through then back both pots all the way off. In between, there are a myriad of different effects from the subtle to the ... not-so-subtle. Suggested pot values are 20k and 50k, but if you want the PT2399 to do odd things then by all means make them bigger. If you want shrieky, echo-y feedback then omit C18 ...
In addition, the PT2399 is rather prone to distortion if the signal is particularly hot (eg. direct from a VCO) - you may want this, but if you don't then it may be a good idea to run the input signal through an attenuator first.
Whilst the circuit as a whole is pretty stable, it's still possible to make it feedback with particularly hot input signals.
Files for panel fabrication can be found at: http://yomo.interzen.co.uk/panel-files/sotd-echo/
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I've been a musician for a while now - up until quite recently my weapon of choice was a bass guitar, but having fallen down the rabbit hole that is modular synthesis I have a new way to make noise ...
I started out the usual way: buy a rack and a bunch of modules (ADSR, VCA, VCO, that kind of thing) and start making noises. Then I discovered the DIY scene and it all snowballed from there - sequencers, filters, logic modules ... four racks full of noisemakers later and I'm still not done.
I'm a big believer in the KISS principle - Keep It Simple, Stupid! If you want all-singing, all-dancing multifunction modules then this really isn't the place for you - I prefer to build modules to do one thing and (hopefully) do it well. This is a rule I follow when I develop software, and hardware is no different.
The stuff you'll find here will generally be 'excess' from a run of boards - the underlying designs will have been tested and known to work, all you need to do is source appropriate componentry and do a build. I'm not going to make any claims that I'm the world's best circuit designer, but hey, if it ain't broke ...
For the really curious, despite working as a software developer I do have a PhD in theoretical physics, specifically the numerical simulation of explosions. It isn't nearly as interesting as you might imagine :-p