PWM motor controller

[Ord Millar]

1N4749A  - 1 watt, 24V zener
1000 pF = 1nF, 1000 nF = 1uF
(.1uF is 100000 pF)
.1uF is easy to find in disk or ceramic monolithic, not electrolytic.
3.3uF can be found, should have a part number containing 335.



-----Original Message-----
From: owner-diy_efi at efi332.eng.ohio-state.edu
[mailto:owner-diy_efi at efi332.eng.ohio-state.edu]On Behalf Of Tom Sharpe
Sent: Wednesday, February 03, 1999 12:22 AM
To: diy_efi at efi332.eng.ohio-state.edu
Subject: Re: PWM motor controller


>     Pwm.txt Write up on circuit
>     pwm1.gif    Image of schematic
>
> Have fun, and let us know how your experiments work out!
>
> BobR.
>
> Any questions, just post...

I got out my rusty Tech America catalog and foundall the resistors and
capacitors. I'm not a EE so I need lots of help.

1. What is a 18-24v  1Watt Zenier (I think I know but I need a PN).

2. IRFZ44 (pg73) T220 or IRFP044 (pg74) 4 pin package and 180W - 57
amps.

3. IN4753A or IN4755A (pg62) 36v 7ma - 43v 6ma

4. 470 uf 25V -- only electrolytic ???

5. For the .1 uf and 3.3 uf cap, use electrolytic?  can't find disk cap.
What voltage?? 16?  How do you convert pf to uf??

6. I want to run it from a stamp computer (or possibly a HC11 SBC)
driven from a Fuel pressure sensor and the tach lead. What do I need to
change?? I think the input is 0-1 volt or 0-5 volts. Help

25 psi <= 2K rpm,
75 psi >= 6K rpm,
rising rate from 2K to 6K rpm

I could drive it directly from the 0-5V fuel pressure sensor. -------
the lights just went on again...

Thanks in advance - I will test it with a pot -  what wattage??? will a
small one work?

Tom Sharpe