pull up resistor ?
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
pull up resistor ?
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?
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BottleFed70
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Re: pull up resistor ?
It also goes to pin 24tech-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?
1970 Ford Mustang
MSII, v3.0 PCB, v2.36 firmware, Megatune 2.25
MSII, v3.0 PCB, v2.36 firmware, Megatune 2.25
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...
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...
MS-II V-3 Megatune 2.36 Relay Board
1974 Jeep J10
Stock AMC 360 with smog removed
GM TBI with 55# injectors
Duraspark with HEI External Coil and 8 Pin Module
1974 Jeep J10
Stock AMC 360 with smog removed
GM TBI with 55# injectors
Duraspark with HEI External Coil and 8 Pin Module
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muythaibxr
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- Posts: 35
- Joined: Thu Oct 14, 2004 11:48 am
- Location: Berwyn Heights, Maryland
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!
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!