This is the traditional voltage follower configuration with the 741 operational amplifier. The circuit is from 1976 documentation and the power supply must be symmetrical from 6 to 15 V.
This circuit allows the use of an electret microphone with a 1.5 V source. We found it in the...
This is one of the many versions we have of this alarm on our website. It was found in an English...
The circuit shown in the figure was found in a 1974 publication. The field effect transistor may...