Guitar effect pedal technical resource info:
Some great sounding Treble Boosters through the decades from the 1960s to now:
Dallas Rangemaster, one of the all time greats
Vox Treble Booster: late 1960s/early 1970s
Nick Thurn 1978 Treble Booster:
Fryer Ringmaster 2000:
Fryer Germanium Treble Master 2001: PNP AC128 designed for Guitar Magazine DIY project
Experimenter’s DIY Treble Booster Circuit ideas:
Suggested range of values for the experimenter’s DIY Treble Booster schematic: alter component values and transistor types to suit your musical tastes and amplifier requirements.
Capacitors: C1:1nf to 22nf, C2: 10nf to 100nf, C3: 10uf to 470uf electrolytic, C4: 10uf to 220uf electrolytic
Resistors: R1:100K to 1M, R2:100K to 470K, R3:22K to 68K, R4:4K7 to 10K, R5:1K to 3K9, R6:22K to 1M, R7:0 ohms to 1K.
Other things to try: resistor R”X”: 0 ohms to 2K2 this will tend to change the upper mid “focus” of the booster sound with values closer to 2K2 smoothing out this mid focus and lower values (esp 0 ohms) giving a harder more direct rangemaster type focus. Like all things, alter to suit your taste. Capacitor between transistor base and emitter 100pf to 2n2, series resistance between C2 and R6, capacitor between output and ground, R6 resistor as a output level pot, R1 as an input level pot, series resistance 1K after input C1 to assist with RF rejection, R4 collector resistor configured as 10K level pot as per original 1960s rangemaster booster circuit.
Transistor Q1: 2N3904, 2N5088, 2N5089, 2SC1815, 2SC732, BC107, BC108, BC109, BC182, BC183, BC184, BC149, BC173, BC546, BC547, BC548, BC549, MPS8098, MPSA05, MPSA06, MPSA18, MPSA20 as well as other suitable NPN transistors
Maybe not one of the greats yet, but with experimentation you can make this circuit above sound great!
Strap mounted mini booster using surface mount components:
I have been asked by Red Special enthusiasts to draw up a cheap good sounding do-it-yourself booster that would be suitable to mount in a lightweight small enclosure on a guitar strap. This uses surface mount components so as to keep the pcb & componentry size small.
This design is experimental and theoretical at this stage because I haven’t made one yet, but is based on other experiments and should work fine. As usual, adjust key areas to suit what sounds best to you.
more guitar pedal info coming