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MB3775 to control dc motor

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be80be

Well-Known Member
That don't control a motor it for a switching power supply it uses pwm to step the voltage up. Or down
 
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magester1

New Member
I was affraid of that, just asked here to be sure.

Then i'll just ask another thing, is there any way i can generate a triagular wave from a square one?
Without the use of counters.
 
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be80be

Well-Known Member
Your old printer has a motor controller in it you just haven't found it. If it is smd type chips look for a chip that has 4 pins on both sides solder to a tab.
 

magester1

New Member
The printer was a great source of components, i removed 2 ULN2023 and 2 ULN2803, schmitt inverters, d flip-flop, there's only one i haven't checked so i'll do it as soon as i can.
Thanks for your help, i'll try what's on that website, it might just work instead.
 

be80be

Well-Known Member
You no old hard drives have very good motor controller in them. but the best place i found
was a big cannon copier. It had some big gear head motors and 10 or so motor controller boards.
 
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magester1

New Member
Don't worry, i gave up on that, i'll try with PWM with the op-amps (that's why i asked about the triangular wave).
 

be80be

Well-Known Member
You don't need a triangular wave or a opamp for pwm you can use a 555 I have a good circuit showing how
 

magester1

New Member
I know i can use the 555, the problem is i live in a small town, i can only get basic components, like resistors, transistors, that kind of things. There isn't a single place that sell ICs and buying them online would be quite expensive with the shipment and everything, so i'm using what i have.

By the way, thanks for all your help.
 

Sceadwian

Banned
What country do you live in magester, shipping in the US from electronics site is generally very reasonable and there are plenty fo good websites to get mixed IC's from cheap.
 
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be80be

Well-Known Member
where you live I'll send you some good chips there not new but they work I tested them
 

magester1

New Member
What country do you live in magester, shipping in the US from electronics site is generally very reasonable and there are plenty fo good websites to get mixed IC's from cheap.
I live in Argentina, in a small city. That's why shipments are expensive, i'm far from capitals and main cities. But i'm moving to the country's capital in a few weeks, i'll see what i can do then.
 
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