Escobedo MOSFET Duende
Here’s a simple MOSFET-based booster circuit that’d be a nice alternative to the SHO. Should fit in a 1590A. FYI, the 1N4739 diode in the layout is a 9.1v zener. Here’s the schematic for reference.
Boost
EQD Arrows
I traced this one a while back and created the Lawn Darts PCB over on the store from it. About time I made a perf and etch layout. If a Rangemaster and an Electra ever got together and had a baby, the Arrows would be the baby. Should be an easy fit in a 1590A … Read more
JHS Haunting Mids
The JHS Haunting Mids is an EQ circuit that controls the mid frequencies along with giving a 10dB clean boost. From the JHS site: The Mids and Sweep controls work very closely together so you can find the perfect frequencies to boost or scoop mid frequencies. When the Mids knob is at 12 o’clock, no frequencies … Read more
Pink Jimi Photon ‘Weetie Pi
Here’s a really cool and versatile dirt pedal design by Pink Jimi Photon. He’s made a lot of contributions to the DIY community and whips up some cool stuff. Check this thread on FSB for the schematic and Jimi’s description of the circuit.
ThroBak Strange Master
Essentially a Rangemaster with a switch selecting the input cap (Hi/Lo) and another switch (Ge/Si) selecting between a germanium or silicon transistor. The bias pot helps to fine tune the bias (imagine that lol) differences between germanium and silicon modes. Other transistors can be used other than what’s specified. Something in the 100-120 hFE range … Read more
Way Huge Tone Leper
This is a rare one from the early 90s from Way Huge and is based on the Craig Anderton Frequency Booster. Stock it gives a mid range boost (800Hz), but that frequency can be altered by swapping the 2, 22nF caps: 220nF – 90Hz (lows) 100nF – 200Hz (low mids) 10nF – 2kHz (mids) 4.7nF … Read more
Devi Ever Dark Boost
Haven’t done a Devi circuit in a while, and I keep stumbling across them, so here’s the Dark Boost. It’s essentially an Electra circuit without the clipping diodes and a Pre-Gain control. Apparently works pretty well on bass too.
Nine Volt Nirvana Tape Measure
Found a bunch of Nine Volt Nirvana/Joe Gagan schematics on Fredd Brigg’s blog. I’ll probably do a few more of them, but first is the Tape Measure boost. Super simple and should easily fit in a 1590A. Original unit used a trimmer instead of an external volume control, but I figure most people will want … Read more
Demeter Fat Control
Looking for a mid-range frequency booster? This one’s apparently really good at it. Schematic and discussion on FSB here.
Catalinbread VariOboost
Here’s an older design from Catalinbread, but an interesting design as usual. It’s a preamp/boost with a wide range of tone shaping capabilities. Schematic can be found here.