Wednesday, August 22, 2012

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Touch Activated Light circuit using Mosfet IRF510

Here is a circuits light a 12V/20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. This circuit uses a power MOSFET (IRF510) which turns on when the voltage between the source and gate is around 6 volts. The gate of the MOSFET draws no current so the voltage on the gate will be half the supply voltage or 6 volts when the resistance across the touch contacts is equal to the fixed resistance (2 Megs) between the source and gate.

Touch Activated Light circuit using Mosfet IRF510
Mosfet IRF510 Pi
Absolute Maximum Rating Of IRF510
Drain to Source Voltage        : 100 V
Drain to Gate Voltage          : 100 V
Continuous Drain Current (ID)  : 5.6 A
Pulsed Drain Current (IDM)     : 20 A
Gate to Source Voltage (VGS)   : ±20 V
Maximum Power Dissipation (PD) : 43 W 

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