| Electronics > Projects, Designs, and Technical Stuff |
| No sound at all on double-checked superbasic distortion circuit... |
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| Vicc:
I want to thank everyone for your input. Adhering to the forum rules, I didn't state that I'm a total newbie but you guys won't believe it even if I told you so... THIS CIRCUIT was used by probably the most innovative american musical instrument manufacturer of the 70's: Electra Guitars https://www.electraguitar.com/pages/history I replaced the 2.2MΩ with a 470R though, still nothing. But when I changed that back and then decided to use a 470Ω as the R2 resistor, I can now hear sound through the speaker, almost imperceptible even if I crank up my amp's volume from 10 to 11 and that's definitely no distortion at all! The only logical explanation, at least for me, lies in those 1/2-watt resistors I'm using, so I'll post any update as long as I acquire some of those pesky 0.25-watt resistors... |
| bob91343:
The power rating of the resistors won't matter. Your change from 2.2 meg to 470 Ohms is too radical. Try 1 meg and other values in that general range. |
| John B:
Changing the 68k to a 470R drastically lowers the output impedance. Did you specify what load on the output this circuit was driving? Maybe the 68k produced no sound because your output is quite loaded. |
| Vicc:
Specifying a load? Sorry John B, I don't understand. Using the 470Ω as the R2 resistor, Vbe voltage is 0.49 when meter is on 20V DC mode (red probe on the base and black probe on the emitter)... |
| John B:
As in, what did you connect the output of the circuit into? |
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