We found this circuit in a 1982 documentation. It uses a CA3140 or equivalent operational amplifier and does not require a symmetrical source. The output is 1 Vpp wide.
This small signal-following amplifier uses an integrated one that is not very common nowadays. Powered...
The resonant circuit depends on the crystal frequency that can go up to a few megahertz. The...
This direct conversion receiver circuit was found in Radio Electronics from the 90s. The...