6W Variable Tone Siren (CB25213E)

This CMOS circuit was found in the July 1990 Radio Electronics magazine. Power is for a 12V supply.

| Clique na imagem para ampliar |

Tuned audio oscillator (CB22254E)
This circuit is from a publication from the 50's. Inductive components are critical, and...
Stereo Pre Amplifier (CB18559E)
This simple two-transistor circuit used transistors from the 60s, having been found in a...
Capacítancemeter (CB3878E)
This circuit uses an oscillator that generates a signal of approximately 1450 kHz to test...