This circuit is from the 1983 Intersil Databook. The circuit has an A / D converter for display of 4 and a half digits being powered by a voltage of 9 V.
The circuit shown in the figure consists of an amplifier for stereo sources with Maxim's MAX9723...
We found this precision circuit in a manual from the 80's. The operational amplifier is of a...
This passive circuit was found in old American documentation. It can be added to any amplifier input...