PWM DC MOTOR SPEED CONTROL HHO hydrogen generator Start Price USD 60.00 Current Price USD 60.00 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Saturday, August 30, 2008 End Time Tuesday, September 09, 2008 Location FLUSHING See more about 'PWM DC MOTOR SPEED CONTROL HHO hydrogen generator ' Description 1-  adjustable frequency from 1440.00 hz to 144,000 hz (1.4khz-144khz) 2- adjustable duty 0-99% 3- irf530 mosfet rated at 100dc volts, 14amps continuous, and 56 amps pulsed. 4- use same power supply for pwm unit and load (such dc motor, hho, dimmer) or separate power supply for load ( for example you can use 9volt battery to power pwm and 12-100 volts dc, to power your load  .......hho, dc motor, etc by simply removing jumper link) this is the only unit that lets you do that All other unit have 24 volts maximum output   This item is fully assembled and tested before shipped. this is not a kit that you have to solder a lot of little pieces together.NO Soldering Required The circuit uses two timer/oscillators connected as aPulse Width Modulator. The chip used is an nmos dualtimer/oscillator, NE556. This IC has two 555 timers inone 14-pin IC package.One 555 (IC1:B) is configured as an astable oscillator.The output frequency of the trigger pulses is given by:f = 1.44 / ((R3 + 2R4)C2), or about 410Hz.The time period for the high output is given byTHIGH = 0.69(R3 + R4)C2 seconds.And, the low output by TLOW = 0.69R4C2 seconds.The second 555 (IC1:A) is configured for Pulse WidthModulation. It is set up in monostable mode. It istriggered with the continuous pulse train from the first555. However, by also applying a DC voltage to pin 3the comparator reference levels will be changed fromtheir nominal levels of one-third & two-thirds of thesupply voltage. This has the effect of modulating thepulse width as the control voltage varies.The control voltage is supplied via transistor Q1, whichis configured as an emitter-follower. This means that theemitter output voltage follows the base input voltage(less 0.6 volt base-emitter drop). This configurationgives us a low output impedance voltage source withwhich to drive the control input of the timer. This makesthe control voltage less susceptible to the loading effectof the timer control input.The output from the timer is a continuous stream ofpulses whose width is controlled by the voltage levelapplied to the control voltage input. This modulatedoutput drives a MOSFET, Q2, which is used to switchthe voltage to the DC motor.The maximum ON time of the output pulse, andtherefore maximum motor speed, can be set by adjustingthe trimpot P1 (and maybe resistor R1 as well).The motor is always connected to the terminal block,pins M+ and M-. If the motor is driven with the samepower supply as the controller then insert link LK1. Ifseparate power supplies are used to drive the controllerand the motor, then remove link LK1 and connect thepositive & negative motor power supply lead to the pinsmarked E+ and E-. This ties together the ground linesfrom each supply by a connection on the PCB.Operating SpecificationsKit supply, Vcc: 5V - 16V which is the operating rangeof the 556 IC.DC motor: The IRF530 MOSFET is rated at 100V sothis is the maximum voltage that you can run the motorat. The maximum current the MOSFET can handle is16A continuous and up to 56 amps pulsed. However the PCB tracks can only handle up to7.5A at 30E C. You can always thicken up the trackswith wire links to increase the current handling capacity.Even so the maximum motor current will depend on justhow hot the MOSFET gets when running. While 16A at 100volts is the absolute maximum in reality it will be something lessthan this.How to Connect. 1. Always connect the two motorwires to M+ and M– on the terminal block.2. Always connect the power supply to the kit (5V-16VDC) to the terminal block V+ and V-3. You have a choice whether to use the same DCvoltage to both the motor and the kit, or to use adifferent voltage for the motor (eg, it might be a 24V,36v,48vmotor) from the 5-16V for the kit. Specifications: L: 4" W: 2-3/8" H: 1-3/4". DC Motor Speed Controlled via a potentiometer. Speed control for DC motors up to 100 Volts @ 14 Amps without sacrificing motor torque. Uses NE556 to pulse-width modulate IRF530 MOSFET. This DC Motor controller can handle up to 16Amps, but PCB trace capacity would have to be beefed up with some hookup wire where DC motor current runs through the Printed Circuit Board. Requires operating voltage of 9 - 18 VDC. Plastic case for DC motor controller circuit is included. This PWM DC motor controller circuit can be used for generating hydrogen, build your own fuel cell station. More common uses include controlling DC motors in golf carts, buggies, RC cars, robotics, DC hobby motors, toy DC motors, etc. This item is fully assembled and tested before shipped. Thank you for looking. NO Soldering Required  DUE TO EXPERIMENTAL NATURE OF THIS PRODUCT IT IS SOLD AS IS,NO RETURNS!! Shipping will be $6.00 US dollars in lower 48 states ( All others are extra)     Place a Bid!