This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to capture power grid noise, thus making it possible to locate electrical wiring.
The power supply for this circuit must be symmetrical at 15 + 15 V and the load at 4 or 8 ohms. The...
Other operational amplifiers from the same family such as MC34002, MC35001, MC34004 and MC35004 can...
This interesting circuit allows to obtain symmetrical voltages from a simple battery. Among its...