We found this precision circuit in a manual from the 80's. The operational amplifier is of a common type at the time, and equivalents can be tested. Transistors are general purpose types.
This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a...
Found in a 90s American documentation, this circuit mimics the Enterprise warning signal from the...
This circuit came out in a Modern Electronics from June 1990. In it we have a low frequency...