This circuit makes use of a 741 single source operational amplifier to measure resistors on a linear scale. The circuit may use as an indicator a common multimeter on a low current range.
Radio Electronics magazine published in a 90's issue this simple alarm that can use any general...
It actually consists of a tunable field strength meter. The circuit is of an old documentation and the...
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...