Check out this interesting wideband AC millivoltmeter circuit from 1990. The simple design features 12 ranges, decent accuracy, 200 µV accuracy, and a frequency range from 20 Hz to more than 2 MHz.

Here is a simple 12 volts DC to AC inverter circuit. This 120V AC power source is built with a simple 120V:24V or 110V:24V center-tapped control transformer and four additional component. This circuit ...

Back to the Compressor. After this, the refrigerant returns to the compressor as a gas. The compressor takes the gas and pressurizes it, and the cycle starts over. In our pipe/water example, the steam ...

This paper presents a new (5:2) compressor circuit capable of operating at ultra-low voltages. Its power efficacy is derived from the novel design of composite XOR-XNOR gate at transistor level. The ...