PWM-Speed-Motor | Electronic Project Circuits

Posts Tagged ‘PWM-Speed-Motor’

Servo pulse to PWM converter by LM324

The circuit presented on this page attemps to be an interface to convert pulses such as provided by a Basic Stamp or R/C receiver to a dual PWM(Pulse Width Modulation) signal required by an H-bridge. The simplest circuit would use a small microcontroller like a PIC. This circuit takes a more traditional approach. Many experimenters will have all the parts already. Total parts cost should be equal to a simple espresso drink, although I have stopped drinking coffee I still remember how much it costs.

Read more original source:http://www.bobblick.com/techref/projects/sv2pwm/sv2pwm.html

Be the first to comment - What do you think? Posted by admin - July 23, 2008 at 9:29 am

Categories: Electronic Control, Motor controller Tags: lm324 motor driver, pulse-width-modulated, PWM-Speed-Motor, Servo Circuit

Pulse Width Modulators using LM339

The first example uses the standard op-amp oscillator circuit to generate a triangular waveform which is level-shifted and fed to a comparator (e.g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one comparator so that is what we show here.
Read More Source:http://www.4qdtec.com/pwmmod.html

Be the first to comment - What do you think? Posted by admin - February 26, 2008 at 11:56 am

Categories: Electronic Control, Motor controller Tags: lm339 pwm circuit, Motor controller, pulse-width-modulated, PWM-Speed-Motor

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 PWM (Pulse width modulator)chip, adaptation to TL494 or some newer chip should be easy (just compare pin-outs). Equivalents: CA3524, UC3524, SG3524. These are classic PWM ICs, and should be available just about anywhere, for cheap.

* to keep oscillator noise low and eliminate errors (those comparators inside LM3524 are sensitive…), use a large ground plane on the PCB

* timing capacitor C1 should be between 1nF and 22nF, 10nF is a good start. The cap must be immediately next to the chip, and connect directly to the ground plane.

* it would be a good idea to place a 3-pin switch between the power section 12V out and the 12V input for this section, together with a two-color LED (red+green) and series 6.8k resistor, to indicate whether this driver section is running or not – i.e. the flyback is running or not.

* the MIC-AMP lead to the BC547B transistor comes from the audio sense section

* I-SENSE is the current sense feedback signal from the MOSFET section and is only a few 100 millivolts, so you should use a thin shielded audio cable for signal interconnection
Source: http://users.tkk.fi/~jwagner/tesla/tv-driver/schematics.htm