PAIA TubeHead 电路图.pdf

Name:Manufacturer / Designer:Revision:Model # + + + + + + + + + + + + - + + + + - + IC4a 1 - + 3 2 TubeHeadPAiA Electronics11/4/959305 +42v D3D4D5D6D7 33uf IC1e IC1d IC1b 33k33k 220pf IC1fIC1a IC1c 33uf 33uf33uf33uf 10 9 1112 141532 45 76 S1 330 D2100 100uf1000uf 16v 100uf 25v 1000uf 16v 100 Vcc +12v -12v D1 0.05uf 0.5A 12VAC 25v 1k10k 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 2k72k7 150k 47k 10k Drive 22k Vref 10k Output Out Channel 1 +42v 0.01uf1uf 270k270k 100k1uf 1uf 10k 470k 470k 10k 220 82k 5pf IC2b 330 33uf 100k 100 IC2a 20pf 220 2.2uf In 2 16 7 100k Trim 8 6943 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. 1uf RadioFans.CN 收音机爱 好者资料库