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4hv.org :: Forums :: High Voltage
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need help with ignition coil driver

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Arcstarter
Sat Jan 12 2008, 01:29AM Print
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
i am having problems with my driver....i am trying to use a ne555p.will that work?ii have reason to believe it wont because i had a ka555 and it worked fine.i have some ne555's coming and i am hoping they work.so the overall question is will a ne555p work.and also are you suppose to connect the middle and another pin together on a potentiometer?

thank you so much for taking your time to read cheesey
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Logan Kennedy
Sat Jan 12 2008, 04:29AM
Logan Kennedy Registered Member #1103 Joined: Mon Nov 05 2007, 06:02PM
Location: Houston
Posts: 80
I see no reason why the NE555P wouldn't work. It's just a precision timer compared to the regular NE555.

artstarter wrote ...
and also are you suppose to connect the middle and another pin together on a potentiometer?
What pins are you talking about?
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J. Aaron Holmes
Sat Jan 12 2008, 05:12AM
J. Aaron Holmes Registered Member #477 Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
arcstarter wrote ...

and also are you suppose to connect the middle and another pin together on a potentiometer?
Yeah, that's a common "best practice". Sometimes the wipers in pots start to poop out, or else make crummy contact from time to time. If the function of your pot is just as a variable resistor and you only connect the wiper and one end, crummy contact may send the resistance wildly out of range and/or cause the pot to burn up! Of course, that all depends on how much power you're pushing through there, too.

Cheers,
Aaron, N7OE
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