Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
This TTL circuit was found in a 1978 technical documentation. The power must be supplied with 5 V....
This circuit is intended to provide a standard signal for oscilloscope calibration. We found it in...
This circuit of dozens of watts uses germanium transistors and the critical components are...