This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on the diode and the gauge is an analog instrument. A multimeter can be used instead.
This circuit is from the 1982 SGS manual. It shows how to use a TDA3190 in a power audio output...
We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer...
A small voltage-boosting transformer is used in this pulse generator circuit found in...