Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware


Pulse Width (PWM) Controller Circuit

A LM3900 quad operational amplifier can be used to build a pulse width (PWM) controller. The LM3900 was chosen because it only need single supply voltage of 4 to 30 V. This circuit can give 100 percent pulse-width control.  A1 op-amp forms a 1 kHz oscillator, generating a square wave oscillator for the basic oscillation. […]

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Small Package Digital PWM Controllers

Small Package Digital PWM Controllers International Rectifier, IR®, a world leader in power management technology, introduced its highly versatile family of CHiL digital PWM controllers that dramatically shrinks footprint and improves efficiency in a variety of mid-range to high-end and extreme server, desktop, and computing applications. IR’s six new devices meet Intel VR12 and VR12.5 […]

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PWM Control Speed Motor 12V By TL494

This is circuit PWM Control Speed Motor 12V with IC TL494 I See from Idea Circuit by joe (aircraftdesigner) Good Elecronics user. Thank you very much. detail – For Control speed motor 12V max 15A. – R6 Control speed motor. – Driver Motor by Mosfet IRFZ48. – Control at Frequency 100HZ – Adjust PWM duty […]


PWM Motor Speed Controller – DC Light Dimmer by IC LM324

A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit may be used in either 12 or […]


PWM 12V DC motor speed regulator

Reverse engineered circuit diagram of a PWM motor speed regulator out of an oral irrigator water pump. This circuit works quite well, keeping the speed of the small PM motor fairly constant regardless of load. No transistor heatsink is required since this is a switching regulator. The efficiency under high load would be a improved […]


PWM D.C. motor drive Low loss speed control By 4093

This circuit is a very compact switching regulator for small DC motors. I use it for my small printed circuit board drill (18 Volt, 1.5 Amp), but it is suitable for many other applications (e.g. 12V DC halogen dimmer). Circuit description R1, R2, C1, D1, D2 and schmitt trigger IC1B build a 1kHz oscillator with […]


PWM DC Motor Speed Control with NE556,LM311

The left half of the 556 dual timer IC is used as a fixed frequency square wave oscillator. The oscillator signal is fed into the right half of the 556 which is configured as a variable pulse width one-shot monostable multivibrator (pulse stretcher). The output of the one-shot is a variable width square wave pulse, […]


12V DC Motor Speed Controller by IC 4011.

This is circuit 12V DC Motor Speed Controller by IC 4011.. It is easy circuit and easy to build Low cost too. VR1 for control speed DC motor 12V.


PWM Pulse width modulation using 555

IC1 astable gives a fixed square wave at pin 3, C1 and R1 derive uS trigger pulses from IC1 and this will trigger IC2 monostable or single shot, the voltage at pin 5 of IC2 will change the pulse width output of IC2, to get it working all the three RC combinations have to be […]


Pulse width modulator by LM3524

* use a large surface ground track/fill for this circuit, otherwise the LM3524 will not work reliably! * mount the two potentiometers through the enclosure, as shown in the picture on the start of this page (these pots are used to control the frequency and duty cycle) * the driver is based on the LM3524 […]


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