This low power circuit can be powered with voltages from 1.8 V. We find it in a 80s Hands On Electronics. The load can be from 8 to 32 ohm.
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...