This circuit identifies the polarity of DC signals and if the signal is AC. The circuit is from 1969 US EDN documentation. Operational may be equivalent.
This circuit is based on the bistable configuration, but with the difference that the values of...
This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741...
The configuration shown in the figure is one of the most traditional when it is desired to produce...