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| Building a Penny Pusher Arcade Game |
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| John Rudd:
Chris, Usually an inductor that is being switched, I.e like your motor, would have a resistor and a capacitor (a snubber network to dampen the ringing) and a hi PIV diode across the motor...... taking the switching frequency to somewhere around 10Khz will eliminate the whine......If you go to Vellemans website and look up their pwm kit,look at the schematic especially around the output stage.That will explain a lot...(hopefully ) |
| wheeltapper:
Hi I just spent 1/2 hour trawling through the maplin website and I can't see that pwm controller that you bought. have you got a code number or is it discontinued now? cheers Roy |
| Bluechip:
--- Quote from: wheeltapper on August 01, 2013, 01:36:52 PM ---Hi I just spent 1/2 hour trawling through the maplin website and I can't see that pwm controller that you bought. have you got a code number or is it discontinued now? cheers Roy --- End quote --- One of these ??? http://www.maplin.co.uk/panel-mounted-speed-regulator-module-30310 Looks a bit like it. Although why they use the word 'regulator' rather than 'controller' I have no idea. And knowing Maplins .. neither would they ... :lol: Dave |
| wheeltapper:
Typical maplins :doh: thanks. Roy |
| raynerd:
Bluechip - so basically, am I correct in thinking based on your information that it is the Pwm controller and its specific base frequency that is causing a frequency in the audible range? |
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