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 circuit in the March 1995 issue of Electronics Now magazine. The circuit has a...
This circuit uses a PNP transistor to modulate a low power infrared LED. Observe the polarity of...
The maximum frequency of this circuit depends on the operational, reaching a few hundred...