Frantone Vibutron

Great sounding tremolo here from Fran, and something for me to finally build with the batch of ICL8038 ICs I bought a couple of years ago! :o)  To keep the size down and make it 1590B friendly I've done away with the rotary switch used in the original, and instead I've used a DPDT on/on/on toggle to select the waveforms.  Functionally they remain identical and you will be able to select sine, triangle or square wave in exactly the same way, but remember to add the link noted.  I've also added an optional "Fast" switch which isn't in the original, but will do what it says on the tin and so some people may like the extra effect.  Thanks to KindaFuzzy on FSB for his schematic.

Info about the original:

Good Vibrations!
All of the warm, soothing tone you'd expect from a great vintage amp trem with the added versatility of selectable waveform.  Designed with the single coil player in mind, this variable amplitude modulator is a favorite among those that want the highest fidelity and smooth performance combined.  The Depth control allows you to dial in as much effect as you like, from the slightest hint of mellow sine wave smoothness to fully gated square wave effects.  The added benefit of a wide Speed range makes this a very powerful tool for the serious musician.  The Vibutron's lemon-lime motif is highlighted by the custom made cherry red Bakelite knobs.
Bon appetit!