We found this small audio amplifier in the November 1999 issue of Electronics Now magazine. The integrated circuit used is not very common today.
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...
This circuit provides a power of the order of 2 W, characterized by high performance. The output...
The sensor can be made using two bare wire or two screen with a piece of tisse between them. One...