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Main => Main Forum => Topic started by: mozzie on October 22, 2019, 05:45:06 pm

Title: SEGA 5k pot wiring
Post by: mozzie on October 22, 2019, 05:45:06 pm

Hi

I purchased an A-Pac from Ultimarc and was wanting to wire up a SEGA G-Loc analogue flight stick.

I’ve attached 2 pics and was wondering if you could help me to understand the pot wiring as I can’t find a manual anywhere and am wanting to connect it to the A-PAC.

The Pot picture is the up/down and it looks like it shares 2 wires (Red / Brown) with the left / right.

Any help would be much appreciated.
Cheers

Title: Re: SEGA 5k pot wiring
Post by: PL1 on October 22, 2019, 07:16:42 pm

Pots are easy.

The black resistive element is a resistor.

5v on the top tab and ground (0v) on the bottom tab allows you to select a voltage (a.k.a. "potential") between those values.

A wiper arm slides over (wipes across) the surface of the board, making contact between the silver ring in the center and a point on the resistive element.

The contact point is the bump on the right side of the wiper.

When you center the knob, the arm makes contact at the green bar, giving you 2.5 volts on the wiper. (assuming it is a linear pot)

When you turn the knob to the blue bar, you get 4.5 volts on the wiper.

If you reverse the 5v and Gnd tabs, green will still give you 2.5v and blue will give you 0.5v. (reverses the axis)

(http://forum.arcadecontrols.com/index.php?action=dlattach;topic=132183.0;attach=304588;image)

Wiring pots to the A-Pac:
http://www.ultimarc.com/a-pac.html (http://www.ultimarc.com/a-pac.html)
(http://www.ultimarc.com/images/apac_step1.jpg)


Scott