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Control Circuit

Index 43

△ connection motor zero sequence voltage relay phase failure protection circuit

Published:2012/12/4 20:47:00 Author:Ecco | Keyword: △ connection, motor, zero sequence, voltage relay, phase failure, protection

△ connection motor zero sequence voltage relay phase failure protection circuit
In the circuit shown in figure, three resistors R1 ~ R3 are connected as an artificial neutral point, when the motor is off-phase, the neutral point shifts, relay K is energized, the normally closed contact gets action to cut KM coil loop, KM loses power and releases, thereby protecting the motor. (View)

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Automatical opening and stopping control circuit of fish tank water pump

Published:2012/12/3 21:44:00 Author:Ecco | Keyword: Automatical opening , stopping control , fish tank , water pump

Automatical opening and stopping control circuit of fish tank water pump
It uses two 555 -based circuits. Its peripheral circuits have a similar structure, and the closed loop is formed by cross- connected capacitors C5 , C3. The device running has two states: working state and intermittent state. In order to guarantee the device's working condition, R3 and C2 form a reset circuit on IC1's 4 feet. This circuit smallest intermittent is half of an hour, and the maximum intermittent is 3h. According tohe R10 values given in Figure, the pump working time is 25min ~ 30min. (View)

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Logic Probe

Published:2012/12/3 20:38:00 Author:muriel | Keyword: Logic Probe

This logic probe uses a single CMOS 4001 IC and can display high, low and pulsing outputs. (View)

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Electronic Mouse Trap

Published:2012/12/3 20:34:00 Author:muriel | Keyword: Electronic Mouse Trap

Electronic Mouse Trap
This circuit uses a conventional spring loaded mouse trap, available from hardware stores. However when a mouse is caught, the circuit triggers and transmits an interrupted tone on the commercial FM band to a nearby radio receiver. The transmitter and tone are adjustable so it is possible to build more than one unit and monitor several mouse traps simultaneously. (View)

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Room Monitor

Published:2012/12/3 20:32:00 Author:muriel | Keyword: Room Monitor

This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm. It can be run from a 12 Volt battery or mains power supply as shown below. Interconnect uses 3 wires, so multi core cable can be used; alarm or telephone cable is suitable just leave any extra wires free. (View)

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Wart Zapper

Published:2012/12/3 20:31:00 Author:muriel | Keyword: Wart Zapper

Wart Zapper
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Ignition Coil Driver

Published:2012/12/3 20:30:00 Author:muriel | Keyword: Ignition Coil Driver

Ignition Coil Driver
This design uses a 555 timer and three 2n3055 switching transistors to provide a variable frequency, variable voltage input to an automotive ignition coil. Normal output is 25kV when run at 12v input and at the coil's resonant frequency (8kHz). Increasing the voltage output to about 50kV is possible if the input voltage is increased to 34v, however this risks burning out the switching transistors when the system is operated for an extended time. Electrical Diagram: Capacitors: rated at 50v Resistors: 1/2w, 5% tolerance Output frequency to the coil is controlled by VR1, output voltage is controlled by VR2. V+ is connected to pin 3 on the 5v regulator. (View)

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Privacy Circuit

Published:2012/12/3 20:28:00 Author:muriel | Keyword: Privacy Circuit

Privacy Circuit
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Monitor Splitter

Published:2012/12/3 20:24:00 Author:muriel | Keyword: Monitor Splitter

Monitor Splitter
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IR Remote Volume Controller

Published:2012/12/3 20:23:00 Author:muriel | Keyword: IR , Remote Volume, Controller

IR Remote Volume Controller
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Audio Indicator

Published:2012/12/3 20:22:00 Author:muriel | Keyword: Audio Indicator

Audio Indicator
This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator. (View)