Circuit Project Electronic www.eleccircuit.com

Circuit Project Electronic www.eleccircuit.com

12 volts switching power supply using transistor

Posted: 08 Feb 2013 10:55 PM PST

One of my friends asked. Can we build the switching dc power supply circuit with 2 transistor? The applications IC that Sometimes is difficult. A some number IC is hard to find. and very expensive. When considering Applications for some time. We do not need to use a high current. and have sufficient space to install circuits. The selection use the transistors. Therefore as an alternative to saving, and extremely value for money. How it works In Figure 1 it is design of the switching regulator, which is a step down dc converter converts the voltage from 15-20 volts to a voltage of 12 volts. The important components is T1 act as switching and has a common components The main are L1, D1 transistors, NPN+PNP Acted to feed back to each other. Increased frequency generators or to Makes the switch to run continuously. Only in this circuit of coil is [...]

12 volt DC motor speed controller with pulse

Posted: 08 Feb 2013 08:42 AM PST

Usual, we just enter the voltage and DC current source to the DC motor, Makes motor can be rotated. If will modify or regulate the speed in rotation of the motor. Wewill need to enter the voltage look into pulses or periodically. Which will makes the average voltage at output is different. By the pulse voltage is high frequency will has the average voltage than the low frequency pulse. The same with the pulse has over duty cycle value, it will has the average pressure much than low duty cycle value. The working principle. The average voltage will be supplied to the DC motor. To control the motor rotation is slow or fast. This circuit uses the above principle. By makes the pulse generator circuit or astable multivibrator Which consists of IC1 / 1 and IC1 / 2 inverter gate with C1, R1, R2, VR1 and diode D1, D2. The [...]

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