This circuit shows how to make an adaptation on an AM receiver to receive CW and SSB signals. The circuit is from an 80's documentation. The diode is commonly used.
This step of high gain and high voltage supply with direct coupling is from a documentation from...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
The integrated circuit used in this 1986 project is uncommon today, but the idea of the output...