Crystal Drive

[HamishR]

I built it as per Chuck's schematic. Except I used a 10µF cap at C4, BAT46 diodes, a B100K pot for Gain and 2N5088 transistors. Otherwise absolutely identical.

I quite like this one. Gnarly slightly sludgey overdrive with a hint of fuzz.

 

[Fingolfen]

That looks amazing!!!

I'm going to have to try that one out... I've been clearing out breadboards as I have about 3 circuits I want to test out... including my next "semi-original" project...

 

[Chuck D. Bones]

Looks great!
What color is the LED ring?

 

[HamishR]

The LED ring is blue. Hence the blue knobs.

I really like these mini chickenhead knobs. The colours are very Lego. The red ones are particularly vivid - so get a red LED ring.

 

[hdansin]

Built one of these and it sounds incredible. Thank you so much for providing this PCB, and for your good ears in tweaking the circuit. I won't post a picture since my build is kind of ugly... but I was wondering if, like the EQD original, you can run this at 18v for more headroom. Would it fry the circuit?

 

[Chuck D. Bones]

Running either the stock Chrysalis or this mod at +18V will not increase headroom. It reduces the headroom in Q2 because it upsets the biasing. As long as C9 is rated for at least 25V, it won't hurt anything.

 

[hdansin]

Running either the stock Chrysalis or this mod at +18V will not increase headroom. It reduces the headroom in Q2 because it upsets the biasing. As long as C9 is rated for at least 25V, it won't hurt anything.

Thank you for letting me know!