Ambient light indicator (CB21567E)

This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The power supply does not have to be symmetrical.

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Standing wave alarm (CB8986E)
This circuit triggers a warning LED when the standing waves reach a high value. The circuit was...
Symmetrical Regulator LM380 (CB5879E)
This 80's circuit uses an audio amplifier to obtain a symmetrical source from a single source. The...
Audio Oscillator (CB22017E)
The frequency of this oscillator depends on T1 and C2. The transformer may be of the old audio...