This 5 V circuit was found in December 1978 Radio Electronics magazine. The power transistor must be mounted on a good heat sink.
Found in a Popular Electronics from the 80's, this circuit triggers an SCR keeping an LED on when...
This circuit of old medical documentation generates pulses in a ratio of 20 to 300 and duration of 3...
This well-designed bistable configuration is for educational purposes. We found it in the...