FREE
circuits!
Recently added diagrams and projects
December 10, 2010
This is a small, portable set, designed for those aiming at look improvement. The Bio-Stimulator provides muscles' stimulation and invigoration but, mainly, it's an aid in removing cellulitis. [more]
December 10, 2010
Here the popular 555 timing IC, is wired as a monostable. The timing period is precise and equivalent to: 1.1 x R1 x C1 [more]
December 10, 2010
Oscilloscope testing module (huntron circuit) [more]
December 9, 2010
his circuit is built from standard components and can easily be adapted to be controlled by a computer. If you use cheap surplus transistors and stepper motor, the price of the circuit can be kept... [more]
December 9, 2010
This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. In fact when forward biased,... [more]
December 9, 2010
This circuit relies upon the extra high input impedance of a FET, and also demonstrates the gate terminals sensitivity to changes in voltage. The gate terminal here is left open circuit, connected only to the... [more]
December 9, 2010
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made... [more]
December 9, 2010
This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost... [more]
December 8, 2010
This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses... [more]
December 8, 2010
The piezoelectric element of a kitchen gas lighter is used in this simple, yet effective seismic detector. The piezo element must be placed vertically, one end solidly to ground. [more]
All posts