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.
The resonant circuit depends on the crystal frequency that can go up to a few megahertz. The...
This circuit is from the 1983 Intersil Databook. The display is plasma and must be excited by a...
This is a typical common emitter amplifier stage configuration. The transistor can be used...