Found in a 90s 303 Circuits, this circuit triggers a load from a 50 mV audio signal. When the signal ceases, the charge remains active for 2 seconds.
This circuit was found in a 1965 General Electric documentation. It is intended for reception of the...
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
This circuit is suggested by Motorola and is based on a 1723 voltage regulator. The 2N3055...