AcidMods Resources ----- ( These are helpful tools for modding ) > Electronics Projects
Boost gauge help
Brian 503:
Here is the main circuit board to my boost gauge which controls my ladder shift lights. The previous owner ripped the knobs right off the board. The knobs turn clockwise and counter clock wise to raise or lower shift light indicator by 100 rpm. Their is also a spst tac switch if u press in the knob which controls the shift lights to be on/off or if held for 3 sec resets programmed settings back to stock. This part I'm not concerned with. I'm concerned about finding out what part I can get to replace the rotation factor of the knob. I'm wondering if I can use a volume Potentiometer to dial in the shift light settings. I'm assuming these three knobs are a Potentiometer? I wish it was as easy just to order replacement parts but it's basically impossible. Only 1000 of these were produced. Any insight or help is appriciated!
Modded Matt:
They appear to be a simple Pot...
Brian 503:
The actual knob has 3 metal fingers that spin across the metal plate. I'll test my luck at it but I need to do some voltage test to see what type of voltage is being fed to the pots.
RDC:
There's something odd about the way the carbon trace is laid out inside there, almost like they are something between a POT and an Encoder, and I'd say they are almost for sure some kind of Encoder because of the way the Resistors, R1 thru R6 are setup on them.
A typical linear POT will not work right in place of those.
The voltage isn't going to be anymore than 14.4v for it, and is most likely just 3.3v to 12v, with 5v being best guess.
This isn't what I'd say for sure they are, but it's more in the same layout versus how a POT would be used in there. http://industrial.panasonic.com/cdbs/www-data/pdf/ATC0000/ATC0000CE15.pdf
I'd pull one from the board and get to measuring on it, then you'll know how it's laid out internally and can go about figuring up the correct way to replicate it or what to replace it with.
Brian 503:
This is the whole knob assembly. U can see the 3 metal fingers on the bottom of the knob that go over the trace on the encoder. The 3 finger knob base rest on the metal ring of the encoder, them the metal cage snap fits over the knob base. The actual knob as a snap lock that locks into the base of the knob with the three metal fingers. That's the whole assembly. There's also that center plastic inside witch has a tac switch in the inside of it. The knob can be pressed down activating the tac switch as well. Though if need be would be pretty easy to bypass to any other spst tac switch.
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