pzentrady Posted December 9, 2005 Report Share Posted December 9, 2005 i need to use PWM and i want to make it myself from 555timer.But i don't know how to make it if somebody there know please tell me about it Quote Link to comment Share on other sites More sharing options...
smokyLED Posted December 11, 2005 Report Share Posted December 11, 2005 here's an example of a pwm to contorl a motor, http://www.dprg.org/tutorials/2005-11a/otherwise the 555 datasheet might be useful, http://www.fairchildsemi.com/ds/NE%2FNE555.pdf Quote Link to comment Share on other sites More sharing options...
reuben Posted December 12, 2005 Report Share Posted December 12, 2005 ahhh!!! thanks! that's a better circuit than i the one i have, I'll use that to drive the little power transistors that drive the really big ones that run the 15hp forklift motor that i installed in a subaru wagon to make a HE car. RT Quote Link to comment Share on other sites More sharing options...
indulis Posted December 12, 2005 Report Share Posted December 12, 2005 One thing that will happen when using a 555 as PWM is that the switching frequency will change with line and load. Quote Link to comment Share on other sites More sharing options...
reuben Posted December 13, 2005 Report Share Posted December 13, 2005 I did notice that, the circuit i have runs at several hundred Hz with a lot of frequency change along with the pulse width change, i ran a tape recorder motor with it, it ran fine from 0 to full speed, then put a speaker on it to hear what it's doing. I'll try this one and see if it does better. Quote Link to comment Share on other sites More sharing options...
smokyLED Posted December 13, 2005 Report Share Posted December 13, 2005 you should post of picture of the 15hp motor installed in ur car :D Quote Link to comment Share on other sites More sharing options...
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