This low noise preamplifier has a gain of 19 dB in the 30 MHz band. The circuit is from the 80s. Transistors are from the era, and equivalents can be used. The circuit consumption is 13 mA.
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...