Passive tone control (CB20803E)

This tone control circuit can be added to any active amplifier configuration. The performance curve is given next to the diagram.

| Clique na imagem para ampliar |

Light Controlled Oscillator (CB16728E)
This is yet another version of the light-controlled oscillator that can be found on this website. This...
12 V Regulated Source for Tube Filament (CB20286E)
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...
Presence Monitor (CB12618E)
The incidence of light in the LDR causes this circuit to start operating, emitting a sound whose...