By popular demand, here's the PAL 800, a well regarded Marshall-in-a-box circuit. Should fit nicely in a 125B. Schematic here. All the trimmers except the one just below the Volume control are for biasing the JFETs. Start at 4.5v on the drain of each JFET and adjust by ear from there. The other trimer is for smoothing out the output signal.
Tuesday, October 26, 2021
Tuesday, October 5, 2021
Had a couple questions about stompbox use with line level, so I drew up this. This allows you to drop the line level signal down to instrument level, send it out to whichever stompboxes you want to use, then back and amplified back up to line level. Schematic and discussion here. Made two versions, one that could be run off typical +9v pedal power, and another for bi-polar 12v supply used in Eurorack synths, so you can build it either in pedal form or Eurorack module form.
Tuesday, August 31, 2021
Turns out the Southland is pretty much the same circuit as the Lightspeed, but with some hard clipping diodes thrown in the middle (and a couple value tweaks). Figured I'd make a new layout with space for the diodes. This layout uses the same drill template as the Lightspeed.
Friday, August 20, 2021
Happy Fuzz Friday, everyone! Here's a cool take on the IC Big Muff by JuanSolo and Grind Customs. It's essentially the '78 IC Big Muff with the tone bypass switch with the tone stack from the Ultrastoner. Should be able to squeeze it into a 1590B.
Tuesday, June 8, 2021
Tuesday, May 25, 2021
Tuesday, May 11, 2021
Here's a really great sounding overdrive from Hudson Electronics. The Sidecar is loosely based on the Tube Screamer with a 2-band Baxendall EQ and some interesting soft clipping. It uses a PNP germanium as a diode along side an LED and a 1N4148 in an asymmetrical configuration. I've got a fabricated version available in the store as well if you prefer and the schematic is over there in the build doc.
Friday, March 19, 2021
Happy Fuzz Friday everyone! This one recently got traced on the Aion blog (so go check out the full write up over there for more info and schematics). The Karma Suture is based on the Harmonic Percolator and has come in both germanium and silicon versions. The difference between the two are just a couple value changes, so you can build either version on the same board. Value differences are outlined below.
Monday, February 22, 2021
Just stumbled across this on FSB. It's a tap tempo + modulation add on for PT2399 delays designed by Electric Canary. It is digital so you'll either need to buy a pre-programed chipset or burn the code onto the chips yourself. Lots of off board wiring with this, but it's probably worth if you have a favorite PT2399 delay you want to take to the next level. Check out their site for more info, schematic and the code.
Thursday, January 21, 2021
Happy New Year, everybody! This one recently got traced over on FSB. The 25th Anniversary edition of the Red Llama has an added hi cut tone control, but also has a few variations from the original circuit. The hi cut itself is just a basic cap/pot to ground tone control, the minimum gain resistor on the first stage has been reduced from 100k to 91k, and the 2nd stage feedback loop resistance has doubled up from 1M to 2M. Schematic and more info on FSB.