This detector with ultra-low deviation was found in an American documentation from the 90s. Operational amplifiers are from that time. The power supply must be symmetrical.
In the figure we have an application for NLAS5113, a new device from on Semiconductor...
We found this phonographic transmitter for the MW band in a 1956 documentation. The circuit has a...
The circuit shown below was obtained from an Italian magazine Sperimentare from 1977. All...