This circuit was found in a 1977 documentation. It limits the voltage from a source using zener diodes on the rectifier bridge. It is an unusual configuration today.
We found this circuit in a 1980s American documentation. The operational amplifiers of the...
This circuit is intended to manipulate a transmitter (CW) from coded audio signals recorded on a...
This amplifier can be powered with voltages between 2 and 5 V with power up to 100 mW. The minimum...