This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
This transceiver is also low power, but this time, it can generate signals in the 144 MHz band. In the...
This switching boost regulator, which provides a 24 V output from a 12 V input, was found in the...
We found this simple receiver with germanium transistors and listening on a crystal phone in a...