Pwm Driver | Electronic Project Circuits

Posts Tagged ‘pwm driver’

8 Channel PWM LED Chaser PIC 16F628A

This neat little circuit provides 8 LEDs directly driven from the PIC along with a single mode control switch. The firmware elsewhere on this page drives the LEDs with a 5 bit PWM signal providing each of the 8 LED channels with four levels of intensity; off, dim, mid, bright. A number of sequences are programmed into the firmware to provide some interesting visual effects and chase sequences, including the classic effect seen on the car in the Knight Rider TV series.
Read Source: http://picprojects.org.uk/projects/ledchaserpwm/index.htm

Be the first to comment - What do you think? Posted by admin - May 28, 2009 at 9:45 am

Categories: Microcontroller Tags: LED Chaser, led display sign, pwm driver

4 Channel DMX512 Driver

This project is a 4 channel DMX512 driver board. It features four power MOSFETs that can be configured to operate in PWM mode or as on/off outputs. The driver can be configured to use any four consecutive addresses across the full 512 channel address range. It can be used to drive LED arrays or low voltage lamps in PWM mode or operate relays in static mode. [...]
Read More : http://picprojects.org.uk/projects/dmx/dmx688/index.htm

Be the first to comment - What do you think? Posted by admin - May 22, 2009 at 1:17 am

Categories: Electronic Control Tags: power mosfet control, pwm driver

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 CD4093 schmitt trigger IC1B build a 1kHz oscillator with adjustable duty cycle.
The output of the oscillator passes through buffer IC1B/C/D which drives power mosfet T1.

When T1 is switched on, a current will flow from the +Vmotor supply via the motor and T1.

When T1 is switched off, the motor current is interrupted; because the motor acts as an inductor,
it will try to maintain its current, which can flow through freewheel diode D3.

The avarage current through the motor depends on the duty cycle of the oscillator.

The circuit losses are very low, for my 1.5 Amp drill, no heatsink is required for T1.

Source : unknow …….