Alternator regulator (CB7121E)

This circuit was found in Radio Electronics from the 90s. Q3 must have a heatsink and R10 fixes the output voltage.

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Light Sensitive Oscillator with the 555 (CB13794E)
This circuit provides a signal of higher frequency the greater the intensity of the light incident on...
Rectangular Generator LM3909N (CB4558E)
This circuit was obtained from a 1978 Practical Wireless. It generates a low frequency, low...
Locked relay (CB21220E)
This circuit can be used as a lockable shield. A pulse activates the relay that remains on even...