Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of Radio Electronics magazine. The range is 6 Hz to 6 kHz and can be changed.
Found in Popular Electronics, this sophisticated short-wave receiver requires a lot of skill from...
This circuit, which can be found elsewhere on this site, detects positive pulses of a signal. The...
This microphone preamplifier with output intensity adjustment is suitable for modulating...