This oscillator with emitter follower was found in an American documentation from the 80's. The circuit generates 100 MHz signals and the transistors admit modern equivalents.
This circuit is a small FM transmitter, capable of carrying its signals over short distances...
This circuit is intended for underwater communications. Of course, the critical point is the...
Originally this circuit excites an incandescent lamp, but it also serves for LEDs, if they use a...