Simple Pulse Width Modulator Servo Driver circuit

It is sufficient to explore PWM (Pulse Width Modulation) and digital-to-analog conversion, illustrating how to create a personal electronics workbench for investigating RC (Resistor-Capacitor) filters, charge and discharge curves, pulse generators, timers, and even a simple oscilloscope to understand the...

Discrete PWM Generator Circuit

PWM waveforms are widely utilized to regulate the speed of DC motors. The duty cycle of the digital waveform can be established either through an adjustable analog voltage level (as seen in a NE555-based PWM generator) or through digital binary...

PWM DC Motor Speed Control

This is a circuit for controlling the speed of small DC motors; it works nicely as a speed controller for an HO or N gauge model railroad. More: The left half of the 556 dual timer IC is used as...

ISL8107 Single-Phase Pulse-Width Modulation (PWM) Controller with Wide (9V-75V) V

The ISL8107 is a single-phase, non-synchronous buck controller equipped with an integrated high-side MOSFET driver. It operates within an input voltage range of 9V to 75V. The internal reference voltage is 1.192V with a tolerance of ±1% across the industrial...

Big Trak Motor Driver Schematic

Schematic of Big Trak's motor driver circuit. The toy includes 9112 and 9113 transistors (and sometimes 2N6715) because the 75494 chip cannot supply enough current to run the Big Trak's motors by itself. The motor driver circuit for the Big Trak...

PWM Dimmer/Motor Speed Controller

This project addresses a common need by providing a simple circuit designed to dim LED lights or control the speed of 12V DC motors. The circuit employs Pulse Width Modulation (PWM) to regulate the effective or average current flowing through...

Pulse Width Modulators using LM339

The first example utilizes a standard op-amp oscillator circuit to produce a triangular waveform, which is then level-shifted and supplied to a comparator (e.g., LM339) to generate a PWM waveform. It is common for users to prefer using two comparators...

PWM Motor/Light Controller

These two schematics are variations on another PWM circuit that I designed. The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses...

PWM lamp dimmer using NE555 timer IC. Complete circuit diagram and working

A simple PWM lamp dimmer using the NE555 timer IC. The 555 timer IC is configured as a variable duty cycle astable multivibrator to control the brightness of the lamp. The described circuit utilizes the NE555 timer IC, a versatile and...