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 from 1982 documentation and has some interesting uses, despite its extreme...
This battery circuit provides a charging current of 500 mA depending on the solar panel. The...
This circuit cuts the audio spikes. It was found in an English publication from the 1980s....