A tweaked Foxx Tone Machine that some people have requested. Once again it is traced by TOFO.
So what makes it different from a stock Tone Machine? Lots of oddball resistor values, twice as big input, output and decoupling caps, Shottky diodes and a Mid Boost switch at the tonestack which can be subbed for a on/off/on switch for an extra Mid Scoop setting.
Here’s a pic of my 3699 build with a few mods.
ReplyDeletehttps://www.instagram.com/p/CV5cRFygDUb/?utm_medium=copy_link
That's beautiful and bonkers!
DeleteThanks, Ian.
DeleteInteresting re the 22u caps, as apart from the one on the emitter of Q3, the frequency response is the same as 10u caps, or even 1u for that matter. I made a Tone Machine recently using the Aion FX Vulcan schematic, which has the same mid switch - it has 1u caps, and it makes no difference at all (I checked on LTspice).
ReplyDeleteInteresting. Can you link the scheme?
ReplyDeleteYou can find the schematic on Freestompboxes. Just google Danelectro 3699 fuzz schematic and it should be the first on the list. According to the post, the odd resistor values are a result of measuring values on a vintage unit, where resistor values had drifted over time.
DeleteThanks
DeleteVerified. Thank you!
ReplyDeleteWhat's the deal with "all 100k resistors matched?" What exactly does that mean?
ReplyDeleteIt means they must be measure to have the same exact resistance. Same deal for the forward voltage of the diodes. it makes the octave stronger.
DeleteYup, sounds great. Tag it!
ReplyDeleteCan i get schematic of it?
ReplyDelete