This circuit from an old documentation includes the power supply for the 117 V power grid. It can be adapted to other networks by changing the 10k resistors.
Found in Harris' 90s documentation, this circuit has a gain of 60 dB at 20 MHz. Equivalent...
The sensor in this circuit is a BA315 diode. Other diodes can be experimented, but this is one...
With this circuit you can produce the sound effect passing from one channel to another. The...