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pulse width modulated (PWM) controller for high current
The second 555 timer was configured as a monostable circuit, commonly referred to as a one-shot since an output pulse only occurs if there is a trigger on the input. When this timer is triggered, the potentiometer in the RC...
DC Motor Speed Controller
This article demonstrates how to control a DC motor using an H-bridge driver chip with PWM output from a PIC microcontroller for speed control. While a PIC microcontroller is utilized, other controllers such as AVRs, Basic Stamps, and certain Picaxe...
PWM Modulator
This circuit serves as an introduction to pulse-width modulation experimentation, utilizing a dual 555 timer for simplicity. A small PCB has been designed to facilitate construction. Although not an original design, it complements the "Dimmer with MOSFET" article on this...
LM629PWM drive
The LM629 PWM outputs directly drive the LM18298 dual H-bridge circuit, which functions as a switching amplifier. This configuration employs two H-bridges in parallel to control small DC servo motors. Additionally, the LM629 can be utilized for motion control in...
UC3842AN PWM IC diagram
The UC3842AN is a pulse width modulation (PWM) integrated circuit that is commonly utilized in DVD, VCD, and SVCD players, as well as in computers, display systems, and various household appliances' switching power supply circuits.
The UC3842AN is a versatile...
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...
Control motor PWM schematic
There are two primary methods to control the speed of a DC motor: by varying the supply voltage and through pulse width modulation (PWM). The first method is less convenient, particularly in digital systems, as it necessitates the use of...
High Frequency Switch
This is a high-frequency switch circuit. This circuit utilizes the 2N4391 transistor. When in the off state, it provides a high off-impedance of less than 0.2 pF and exhibits a low on-resistance.
The high-frequency switch circuit designed with the 2N4391 transistor...
Simple DC motor PWM speed control
The 555 IC is configured as an astable multivibrator, producing a constant frequency independent of the duty cycle. The total resistance (R_charge + R_discharge, with the diode in consideration) remains constant at 22 kΩ, resulting in a frequency of approximately...