Like the previous circuits, this one uses a small speaker as a microphone and has two amplification stages with 600-ohm output.
With this regulator we can have currents of up to 4 amps with 5V at the output. The transistor can be...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
Found in a 90s Radio Electronics, this circuit can be used in high voltage experiments, ionizers,...