Showing posts with label FET. Show all posts
Showing posts with label FET. Show all posts
Wednesday, November 19, 2014
FET Touch Switch
The series of touch this switch be an Sklar sentu made using FET. This circuit serves to activate electronic devices only when we touch touch sensors. Once we release a touch to the sensor, the electronic device that is connected is turned off again. The series of touch switch or touch switch is very simple, composed only of a FET, resistor and capacitor. The series of touch switches / touch switches work with source voltage 12VDC. Detailed series of touch switches / touch switch can be seen in thethe following figure .
FET Touch Switch
The series of touch switches / touch switch can only be used to illuminate DC, 12V DC lamp when it replaced the relay, the circuit can be used safely to load the AC network. Sensor touch to this series was made with 2 pieces of plate are arranged close together (within 1-2mm).
Wednesday, September 24, 2014
Simple Variable Voltage Current Power Supply Circuit Using a Single FET
- For many applications the requirements are not that stringent and a simple, discretely constructed regulator as described here will suffice.
- The current limiting components can then be left out.
- With values as shown, the output I voltage is 12V and the output current is limited to 0.5 A. For applications not requiring current limiting the circuit can supply up to 1 A.
- The relation between input voltage, load resistance and regulated output voltage is shown in table 1.
- This table can therefore be used to determine whether the regulation for a particular application is sufficient. The ’heart’ of the regulator, high power low-frequency transistor T1, l must be fitted onto an adequate heatsink. FET T3 operates as a current source with an output 3, maximum of 11 . . . 18 mA: this it limits the base current of T1, of course, but the alternative would have been a very low value resistor; ‘ or this would have resulted in large!
- The cost of high grade, regulated power supplies has dropped with the advent of modern lCs.
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