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.
We found this interesting effect circuit for LEDs in a 1993 publication. The circuit uses very...
This circuit was found in an American documentation from 1968. The configuration can be adapted to...
In the figure we show how to implement an audio oscillator with the 741 integrated circuit by...