This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...
This configuration presents a negative resistance caracteristic such as the one found in...