This circuit was found in the July 1988 issue of Radio Electronics magazine. It makes use of an operational transconductance amplifier (OTA) still in use today.
We found this circuit in an old operational amplifier manual. The operational amplifier can be of...
This receiver we found in a 1992 documentation operates in the 27 MHz band, triggering a relay...
This amplifier is from a commercial product from the 1970s. The circuit uses germanium transistors and...