This article will help you to build yourself a Guitar pedal, that sounds like SansAmp GT2 and Behringer GDI 21.The project is easy to build at home and will add a new impressive sound to your instrument. In short, with this device you get:- simple and low cost design, compact and lightweight device.- 4 different basic settings (clean, clean+tube sound, distortion, distortion+tube sound), changed with a single push-button.- low noise and natural distortion.- low consumption, can be powered by a 9V battery.- low output impedance, can directly drive earphones. Here you can hear recorded samples from the pedal. The tube sound of a guitar amp has become almost mythical for musicians. The soft and natural distortion of tubes, combined with an output audio transformer, is the reason that any player with a sensitive ear is ready to spend big money on such equipment. For DIY projects it is best to use, what is called, a cabinet or speaker emulator. Analyzing the output of a real tube amp, you will find that in contrast with the linear transistor one, it has peak at bass frequencies, a through at 1kHz and second peak above 4kHz. Tube sound (cabinet) output. Transistor sound output.
- Simple design with low cost elements. - Frequency range 60 Hz to 10 kHz. - Power Supply +9V, 6mA. - Output level 0.7 Vp-p. - Input impedance >2Mohm. - Time to build: Appr. 3.5 hours. - Cost of elements: Appr. USD 3.
- 4027 CMOS chip. - TL062 opamp. - 3 NPN transistors 250mA 40V. - 25 resistors, 20 capacitors. - two audio potentiometers. - one FET transistor. - 2 bright LEDs.
In the zip file (3.5MB) you will find:
- Circuit diagram with EAGLE PCB design. - LTspice simulation of the circuit. - Read me.pdf file with explanations and practical tips. - Pictures of the the device.
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