Tone Control circuit with signal isolation and impedance-matching stages. Unlabeled ??? HEP 51 10pf +15v OUT IN 500k 100k 4.7uf 100k 220 ohms 1.0uf 6800pf 22k 250k 22k 25k 2k2 2k2 6800pf 6800pf 6800pf 470k 3k3 0.5uf 470k 56k 20uf 10k 1N914 1N914 220 ohms 2k2 20uf 1k 20uf 10k 47k = HEP 50 Tone Control Circuits Both of these circuits provide some additional control over tone. They were origionally intended for use with synth modules but could be easily incorporated into most any effects circuit.
+ + + + + This tremolo circuit is not a "plug and play" ready guitar effect, however it could be converted to one switching. with relative ease. It just needs some buffering on the input and ouput and perhaps some bypass 25k Rate 2uf 1uf 47k 47k 1uf 2k2 1k HEP 251 4k7 1uf 10k 100k Depth 0.1uf 5k6 +18v 0.5uf HEP 801 1uf 47k OUT IN 1M Controllable Tremolo Circuit
Name: Manufacturer / Designer: Revision: Model # + + + + - - + Ron Black Tube Distortion 10/13/95 Circuit from Guitar Player : October 1981 - 120VAC IC2 IC1 - 747 dual op-amp, others may be substitued but pinout will differ All resistors 1/2 W, 10% prefered Bridge Rectifier - Full wave bridge recitifier, 50 Volts, 500 mA minimum IC2 - LM340K-12V Voltage Regulator 12V 22k 1M 500k 0.1uf 10k 12VAC 200mA minimum Rectifier Bridge 1N3600 470uf 50V 1000uf 12V 6V 100uf 10k 6V 12V 0.01uf 180k 180k 0.01uf 0.01uf 1M 470k 100k 0.1uf 6V 12V Out In Filament of 12AU7A 1 2 3 6 7 1 3 2 12 13 2 1 IC1a 8 7 6 9 10 4 5 4 IC1b
Name: Manufacturer / Designer: Revision: Model # + + + + + + + + + + + + - + + + + - + IC4a 1 - + 3 2 TubeHead PAiA Electronics 11/4/95 9305 +42v D3 D4 D5 D6 D7 33uf IC1e IC1d IC1b 33k 33k 220pf IC1f IC1a IC1c 33uf 33uf 33uf 33uf 10 9 11 12 14 15 3 2 4 5 7 6 S1 330 D2 100 100uf 1000uf 16v 100uf 25v 1000uf 16v 100 Vcc +12v -12v D1 0.05uf 0.5A 12VAC 25v 1k 10k Vref +12v Vcc - Pin 1 IC1 +12v - Pin 8 IC2, IC3, & IC4 -12v - Pin 4 IC2, IC3, & IC4 - Pin 8 IC1 IC1 - 4049 CMOS Hex Inverting Buffer IC2, 3, & 4 - 5532 Dual Low-Noise OpAmp D1, 2 - 1N4001 D3, 4, 5, 6, & 7 - 1N4148 All 1uf caps 50v all others 25v unless marked otherwise. All resistors 1/4W, 5% Original circuit from December 1993 Electronic Musician 82k 8k2 2k7 2k7 150k 47k 10k Drive 22k Vref 10k Output Out Channel 1 +42v 0.01uf 1uf 270k 270k 100k 1uf 1uf 10k 470k 470k 10k 220 82k 5pf IC2b 330 33uf 100k 100 IC2a 20pf 220 2.2uf In 2 1 6 7 100k Trim 8 6 9 4 3 2 3 1 6 5 7 10k 12AX7 Pre/ 100k Trim Pot controls Symmetry 12VAC Clip 47k* 47k" Blend Post resistor and the 20pf cap from the feedback loop of the driving OpAmp. Then change the 47k" resistor to 680k and the 22k resistor in the feedback loop of the Channel 2 is identicle to Channel 1, and uses IC4b for the clipping meter and IC3 for the input/output driver. The input impedance of the TubeHead is about 20k ohms, which is consistant with most gear like Synths, Effects Processors, Mixers, EQs, and so on. 20k is too low for a proper match with high impedance sources like guitar pickups, but a few minor changes take care of this. To use the TubeHead as a instrument pickup preamp, remove the 47k* driving OpAmp to 100k. Now the TubeHead can be used to warm up a cold sounding guitar amp or just provide a great preamp tone.
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