MicroSquirt.com read only forum (Jan.15,2018)

I'm running an ms2 with a pertronix unit and was wondering about the pull up resistor it says to hook a 1k resistor to pin 24 and then to 12v but then where do I hook up my signal wire from the pertronix?

tech-d wrote:I'm running an ms2 with a pertronix unit and was wondering about the pull up resistor it says to hook a 1k resistor to pin 24 and then to 12v but then where do I hook up my signal wire from the pertronix?

It also goes to pin 24

See this:

http://www.seattlerobotics.org/encoder/ ... asics.html

Where is says pin 1 think pin 24

I had no idea what a pull up resistor was or how it works either. There is a lot of talk on this board that is way over my head. I wish there was a plain language manual...

In some circuits, voltage can be either at 0 volts, or "floating"

A pullup resistor just makes it so the "floating" voltage becomes whatever voltage that the resistor is hooked to...

So a +5v pullup resistor will be hooked to +5v on one side, and to whatever you want that voltage to go to on the other side....

For example, for msns-extra, a pullup resistor is necessary on each LED from a +5v source to the negative lead of the LED in order to turn the LED into a spark output....

Then whenever the transistor turns the LED on, it also pulls the +5v from the +5v source through the resistor straight to ground. When that transistor is off, and the voltage would be "floating," it's now +5v going to whatever the negative lead of the LED is connected to, in most cases an ignitor because the transistor is no longer pulling that +5v away from the ignitor.

I don't know if this makes it any more clear, but at least I gave it a shot!