FREE
circuits!
Recently added diagrams and projects
August 8, 2010
The below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from... [more]
August 8, 2010
The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to the set input (pin 6). The photo transistor should be shielded from direct light so that the voltage at the set input... [more]
August 8, 2010
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the... [more]
circuit from:http://www.extremecircuits.net/2010/05/solar-panel-based-charger-and-small-led.html
August 8, 2010
This device is designed to be a simple, inexpensive ‘comparator’, intended for use in a solar cell power supply setup where a quick ‘too low’ or ‘just right’ voltage indicator is needed. The circuit consists... [more]
circuit from:http://www.extremecircuits.net/2010/05/solar-cell-voltage-regulator.html
August 8, 2010
In this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half... [more]
August 8, 2010
Stepper motors are available in several versions and sizes with a variety of operating voltages. The advantage of this general-purpose controller is that is can be used with a wide range of operating voltages, from... [more]
circuit from:http://www.extremecircuits.net/2010/05/stepper-motor-controller.html
August 8, 2010
PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjustable analogue voltage level (in the case of a... [more]
circuit from:http://www.extremecircuits.net/2010/05/discrete-pwm-generator-circuit.html
August 8, 2010
This circuit takes advantage of the voltage drop across bridge rectifier diodes to produce a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as efficient as a... [more]
circuit from:http://www.extremecircuits.net/2010/05/dc-motor-speed-controller.html
August 8, 2010
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W.... [more]
August 8, 2010
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a... [more]
circuit from:http://www.extremecircuits.net/2010/01/one-second-audible-clock-circuit.html
All posts