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.
Common diodes when forward biased present a voltage fall of about 0.6 to 0.7 V. This voltage fall...
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...
Using a 4046 PLL we found this circuit in the December 1989 issue of Radio Electronics magazine. The...