Circuit Project Electronic

This be 8A Solinoid coil driver circuit. Which use mosfet number IRF150 2 amounts, be important equipment , it performs to drive Solinoid coil. Which be valuable low resistance, use current the plentiful. By use the way encourages of input model PWM make use current , share lower, mosfet not very hot. Unless R16 still use fine but current adjust and R15 use fine decorate Release Adj as well .
(PWM duty cycle) D = Vout/Vin , want about 3V, D = 3/12 = 0.25 etc. , want about 9V, D = 9/12 = 0.75. The R16 take keep fine topmost trend has depend upon a kind of solenoid.
The R16 , can fine get from 4A trends arrive at 9A. The D1 help cover up something current flow turn back from solenoid coil. The C1 use increase efficiency of the circuit. The detail is other, please see in the circuit.

This simple 220V power interface is intended as an interface for monitoring electric equipments and devices using a computer. The interface only senses whether the device being monitored is turned on or off. The most important aspect of the circuit is the galvanic isolation between the AC main line being monitored and the interface to the computer. This is done with the use of the optocoupler IC TIL111 but a suitable replacement can be used too.

Useful for electronics hobbyists, this linear workbench desktop power supply circuit converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts). An adjustable three-pin voltage regulator chip LM317T (IC1) is used here to provide the required voltages. The LM317T regulator, in TO-220 pack, can handle current of up to 1 amp in practice.

The diagram shows the circuit of the desktop power supply. Regulator IC LM317T is arranged in its standard application. Diode D1 guards against polarity reversal and capacitor C1 is an additional buffer. The green LED (LED1) indicates the status of the power input. Diode D2 prevents the output voltage from rising above the input voltage when a capacitive or inductive load is connected at the output. Similarly, capacitor C3 suppresses any residual ripple.

Connect a standard digital voltmeter in parallel with the output leads to accurately set the desired voltage with the help of variable resistor VR1. You can also use your digital multimeter if the digital voltmeter is not available. Switch on S1 and set the required voltage through preset VR1 and read it on the digital voltmeter. Now the power supply is ready for use.

Read more Source:
http://apowersupply.com/desktop-power-supply-circuit-34.html