LM317T Voltage Regulator with Pass Transistor

DC Current PWM-Controller. Circuit Engineering. Pulse-width modulation is a method of voltage control that today is used quite extensively. PWM-signals are for the most part used to control motors and pulse power supply units. This purpose is served by a number of control circuits: transistors, special microcircuitry, digital signal processors. As a rule, a transistor, often a FET, is used to control the generated PWM-signal. Widely popular are the width-pulse circuits that control powerful field-effect transistors - MOSFETs. These transistors are capable of switching high current of up to 100A and above at the gate voltage of 12-15V. The on-state transistor resistance is very low, which decreases the dissipated power. Control circuits are supposed to provide for at least 12V-15V difference between the gate and the source. In some cases, PWM-controllers employ microchips with output voltage build-up of up to 25-30V at 8-14V supply voltage, which facilitates connection of the transistor in the circuit with the common drain. For the majority of loads with current consumption of below 10A the circuits do not have an additional voltage build-up unit. Let's look at an example of PWM-controller using a simple circuit based on the logical CMOS microchip inverters. The device is a square-wave generator based on two logical components, where the diodes separately change the electric charge time constant and the electric discharge time constant of the capacitor that sets the ...



http://www.youtube.com/watch?v=DWZYS4-09wo&hl=en

Saskatchewan Institute of Applied Science and Technology Moose Jaw, Saskatchewan, Canada. Computer Engineering Technology; DGTL202 1st year (second semester) students designed and built robotic devices. Winter 2011 Instructors: Shaun Nanan and John McLafferty Components used include the following: PIC16F628 and PIC16F819 QRD1114 Line sensors GP2D120 IR Distance measuring sensor L293D motor driver Twin motor gear box ADC0804 7805 Voltage Regulator



http://www.youtube.com/watch?v=STOT_8qXsPE&hl=en

New Episodes each Monday! You can download the parts list and the code from this episode on my website: jeremyblum.com Watch my TechBits Episode on Analog and Digital Signals: www.youtube.com Watch Jeri Ellsworth's video on Amperes: www.youtube.com Submit your arduino project to element14's arduino contest for a chance to win a soldering station: www.youtube.com This tutorial series is sponsored by element14. Check out their arduino group! www.element-14.com Follow me on twitter: www.twitter.com



http://www.youtube.com/watch?v=abWCy_aOSwY&hl=en

All about what's inside AC Power Adapters. First I break them open, then I disassemble the components, and then I back engineer their electrical and electronic design. Learn to identify, test, and repair AC power adapters. They power your computer peripherals, cell phones, battery chargers, and gadgets? The purpose of wall transformers is to step-down residential AC voltage to a much lower voltage, typically between 3 and 36 volts. Some adapters have an AC voltage output while others have a DC voltage output. Find out if your ac adapter is good or bad.



http://www.youtube.com/watch?v=yCtaZ2TSExA&hl=en