We found this circuit in a 1963 Radio Electronics. It can be used for remote control. The frequency depends on the coil and the power is supplied by a single battery.
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...