Found in Texas Instruments documentation from the 90's, this circuit can be used as a shield due its symmetrical power is 5 V. The circuit has offset adjustment and a pass band of 200 kHz.
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...