This circuit of a 1964 Electronic Design uses a photodiode from the time. Modern equivalent can be used. The standby current is 1.2 mA.
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
This circuit is obtained from old documentation, activating it when there is a power cut in the...
This circuit is from a 1977 application manual for timers. The circuit provides a negative pulse...