This electronic Morse Key for telegraph message transmission was found in an American 1980s amateur radio documentation. The circuit uses TTL technology and must be powered by a 5V voltage.
Frequency modulated signals up to 500 kHz can be decoded with the PLL we show. The demodulated signal...
We found this circuit in an American documentation of the 80's, being indicated for the test of...
This step uses germanium transistors such as the AC151, GE2, and others having been found in a...