Transistorized VU (CB21729E)

The instrument of this circuit can be a common microammeter. The circuit has its operating point adjusted in the trimpot.

Square Generator LF361 (CB24841E)
This oscillator was found in the September 1984 issue of Radio Electronics magazine. The frequency is...
Basic Voltage Comparator LM324 (2) (CB11616E)
In the figure we show how to use an LM324 as a voltage comparator the reference voltage is...
Gate dip meter (CB9709E)
This circuit covers the bands from 1.8 to 150 MHz, with plug-in coils whose characteristics are...