Electronics > Beginners

555 Motor Speed Controller

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mike_mike:
 I tried the attached schematic with RG10 diode and a mini drill (a similar mini drill to Proxxon), and I got the following results:
a. On the mini drill terminals: DS0000.jpg
b. On pin 3 of 555: DS0003.jpg
c. On the G of IRF630: DS0004.jpg

Please have a look at the results and tell me if they are good ?

iMo:
50kHz PWM - isn't that too high?

mike_mike:
Initially the frequency was about 160KHz.
I reduced it to around 40KHz, because I was told to do that...

If I will reduce again the frequency, there could appear some audible noise from the motor ?

When the frequency was lower (with another circuit with 555) then I could hear a noise from the motor at low speed...

mike_mike:
Hello, I am interested in building a fan controller for my PC using the schematic discussed in this topic.
Do you have any suggestions ?
Are there any other things that should be added to this schematic ?

m3vuv:
for the non plarised caps,cant you use 2 polaried ones back to back?

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