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Voltage and current circuit diagrams
October 16, 2010
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5... [more]
October 5, 2010
When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to the level determined by R2. Reverse + and - pins to reverse operating mode. To set voltage... [more]
October 4, 2010
This circuit will detect AC line currents of about 250 mA or more without making any electrical connections to the line. Current is detected by passing one of the AC lines through an inductive pickup... [more]
October 4, 2010
Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or the generator key in the dark.... [more]
circuit from:http://www.extremecircuits.net/2010/05/mains-supply-failure-alarm.html
September 30, 2010
This circuit consists of a Trailing Socket (also called Extension or Distribution Socket) or similar device where two, three or more sockets (depending on the box dimensions and on constructor's needs) will be powered only... [more]
circuit from:http://www.extremecircuits.net/2010/06/smart-trailing-socket.html
September 27, 2010
This circuit has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an... [more]
June 26, 2010
Here is another equally cool low voltage alarm circuit for your glider receiver battery. [more]
June 22, 2010
This circuit was designed to remotely monitor when a couple of electric heaters have been left on. [more]
April 23, 2010
A voltage window switch is in practice the basic lower window limit of this circuit is roughly 3V and the upper limit is 9V. The window range can be extended by fitting a suitable range [more]
April 23, 2010
The opamp is wind as a voltage comparator, with a reference voltage applied to pin 2 and the test voltage applied to pin 3: the relay turns on when the pin 3 voltage exceeds that... [more]
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