With this circuit, signals in the range of 10 kHz to 150 kHz can be received at close to 4 MHz from a shortwave receiver. The circuit is from a 303 Circuits from the 90s.
This is the power supply circuit for the amplifier in the previous circuit. The source is...
This version operates in the opposite way to the previous one, triggering when light falls on the...
The sensors in this circuit are NTCs and PTCs that work in a differential way by directly...