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 circuit was originally designed for communications applications. We found it in a 1980s...
This is a amplifier for XTAL high impedance earphones or piezoelectric types. Current drain is...
This simple circuit controls the brightness of an LED from LDRs, NTCs, PTCs or other resistive sensors....