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Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
i used a 18v cordless drill trigger and transistor but i doubled the input from 18 to 36 it got hot so i putt it all in a jar full of vegetable oil how can i lower the frequency so it is not so loud? its so loud it hurts.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
I have no idea what you did, and I'm not sure anyone else will, and that means no one can really help you. You used the variable speed controller from a drill as a flyback driver? But the output from the flyback, or the actual circuit is making noise? More detail on what you did would help.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
you use the single transistor driver right? If so try to wind the feedback coil tightly over the primary and put spacers in the flyback core if you haven't already.
Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
No he used the simple pulse width modulator found in a cordless drill, its a bascicly a SMD ne555 with a couple of resistors conected to a slidble brush which is moved when you press the trigger, inturn changing the pulse width, which send a signal to a rather large mosfet +33 amps or so.
Ok to answer your question no you cant change the frequency that is why its called a 'fixed frequency pulse width modulator. Look it up on google
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
IT seems like your cordless drill oscillator is running in the audible range around 14-17khz and that is what is causing the loud hi pitch noise. If it is a 555 driving it then try to decrease the resistance between pin 7 and 8 and then decrease the resistance between pin 7 and 2 noting that pin 6 and 2 are connected together. there is also a capacitor on there that will give you a higher frequency if you lower it's value. Remember this is only if it is being driven by a 555 timer.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I wonder if this is not a squarewave oscillator? Maybe it is a sawtooth, like maybe an scr and diac? Because don't flybacks run only on squarewave? If it is like a magneto, maybe it only runs on one type of 'oscillation'. Magnetos run only on a sinewave, otherwise they have low output and heat up pretty bad.
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oil cooled fly back driver
