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12V-24V PWM Motor controller circuit using TL494 and IRF1405

This is the high quality 12V-24V PWM Motor controller circuit using TL494-IRF1405 for that has the low voltage battery checker system, working with soft start, adjust pulse frequency, use for 12V or 24V battery at current up to 20A. Although small and simple, but could be easily used to create an easy, no need to program software.
There are 2 Circuits below!

12V DC motor speed control PWM circuit using TL494

This is 12V DC motor speed control PWM circuit. Which using a TL494 (Switchmode Pulse Width Modulation Control IC) is base for control DC Motor with pulse.

Please detail more:
– For Control speed motor 12V 150Wmax 15A.
– R6 adjust speed motor.
– Driver Motor by Mosfet IRFZ48.x 2pcs.
– Control at Frequency 100HZ
– Adjust PWM duty cycle From 0 to 100%
– Rise and fall time = 10uS
– There is over load current 15A or current limit with current flowing throw R11 and Q1 work to stop IC1

I See from Idea Circuit by joe (aircraftdesigner) Good Elecronics user. Thank you very much.

Source : joe (aircraftdesigner) …..
PWM Control Speed Motor 12V By TL494

12V-24V PWM Motor controller circuit using TL494 and IRF1405

The working of circuit
20A: 12V-24V DC Motor controller using TL494 and IRF1405
Fig:1 Schematic diagram of this projects.
Project features
– Power supply range : 12V to 30V
– Current usage: maximum at 20A
– Current output : Maximum at 20A
– Standby current : 20mA
– Motor controller: 0 to 100%
– Cut off working when lower battery voltage: As setting at 11.5V for 12V and 23V for 24V battery.
– Adjusting pulse frequency: about 100Hz to 1.1 Khz(129 Hz to 1.28 Khz in this projects)
– Soft start: between 0 to 100% in range lower than 1 second
Pulse rising-edge and falling-edge at the gate of MOSFET: 1.5uS and 1.6uS
-VR1:speed controlled
-VR4: Low voltage output protection
-VR3-adjust the pulse frequency output
-VR2-sub speed controller

the-pcb-layout-of-20A 12V,24V DC motor controller
Fig:2 The Copper PCB layout

the component layout
Fig:3 Th components layout of this projects.

Note: My friend sent me this circuit. He said it is very good high current DC motor controller. But is fully article and not clear photo.

Parts will you need
IC1____TL494___Pulse width modulation(PWM)
Q1,Q2__IRF1405___N-channel MOSFET
Q3_____BC327_____45V 800mA PNP Transistor
Q4_____2N5484____N-Channel FET
D1_____MBR20100CT___High frequency Diode
D2-D6__1N4148________75V 150mA Diodes
ZD1,ZD2__1N4744______Zener Diode

C5______________22uF 16V___Electrolytic
C3,C6,C7,C10____10uF 16V___Electrolytic
C4______________1uF 63V____Ceramic
C1____________470nF 63V____Polyester
C2,C8_________100nF 63V____Polyester
C9____________56nF 63V_____Polyester
1/4W Resistors tolerance: 1%
R8,R9_________47 ohms
VR1__________10K Trimpot
VR2__________10K Trimmer Potentiometers
VR3,VR4_____100K Trimmer Potentiometers
10K Potentiometer
The other parts, PCB, Heatsink and more.

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This Post Has 16 Comments

  1. I will do it .I need Money because I am unemployed please respond to my e-mail you can trust me but I am doing for money please don’t mine I got e-mail f

  2. Sir, I requseting we needed simple Automatic water pump control circuit doing.thats way I need your big positive help.. Please send that project or schematic. Thank you sir me waiting for your projects.

    22uf + to 10uf + to pin9,11,12 TL494)

  4. Hi, thanks for circuit published, could you indicate – – what value to calibrate trimers?,
    – how to connect motor, esxternal pot?
    thanks in advance

  5. Hello! I would like to receive the file of the circuit board to manufacture the regulator. [email protected]

  6. Hello! I would like to receive the file of the circuit board to manufacture the regulator.

  7. This schematic does not work. There is a missing trace on the board (on the output pin of lm2940). One electrolytic capacitor has inverted polarity (c10). One ceramic capacitor has two different values in schematic file and board file (5.6nf and 56nf). Please someone respond.

  8. # 12V DC motor speed control PWM circuit using TL494

    Dear Sir ,
    I am a hobbiest and retd electronic engr.Sir i found your [12V-24V PWM Motor controller circuit using TL494 and IRF1405] project .I want to buy the kit or assembled project ,kindly guide me where to approch for the same.

  9. # 12V DC motor speed control PWM circuit using TL494

    I need pwm that mines polarity of motor connect to GND directly . (I think must be used p-channel masfet)

  10. Hi Can you please explain what the circuit between the CT and DT pin ?

  11. what is a “soft start LK1” in your circuit it is connect to DTC(dead time controller) pin .I did’t understand that sir!
    pls help me sir!

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