This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500 MHz and has a buzzer as its indicator. Can be used as a detector for spy transmitters.
We found this circuit in a Linear Technology component manual. The circuit also has a DC zeroing...
This circuit has a scale of 0 to 2.56 V, but it can be changed by changing the values of the...
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...