Has anyone actually checked the resistances on the contacts when the various buttons are pressed (and not pressed)? How do they align with the values listed in the Helms Manual?

I ask because the friend of mine that is helping me with a little project for the controls and my Empeg say that the values listed in the Helms Manual are not possible based on the circuit diagram 2 pages earlier.

 

I don't keep them on hand but I know that at rest it reads about 9,000 ohms - 10,000 ohms. Other buttons go as low as I believe 90ohms.

Shelly's sight had the values and I think they were from the Helms manual.

 

[QUOTE]Originally posted by Pinky
[B]I don't keep them on hand but I know that at rest it reads about 9,000 ohms - 10,000 ohms.

 

You should never see higher than a resistance of 10k + tolerance. I don't have the Helms manual, but 300k is way too large.

 

[QUOTE]Originally posted by pellisS2k
[B]Has anyone actually checked the resistances on the contacts when the various buttons are pressed (and not pressed)?

 

[QUOTE]Originally posted by modifry
[B]Your friend is correct.

 

[QUOTE]Originally posted by pellisS2k
[B]. . . A little A-to-D magic connected to a PIC with a serial port and ive got a nice little super-flexible interface to the dash controls.

 

[QUOTE]Originally posted by modifry
[B]The PIC should be able to do the A-D directly, yes?

 

I've been working on some dash controls interface for some time, it's a more complicated project than it looks at first glance, believe me! I have included an RS-232 interface on the unit I have designed. I have been planning on including serial control of third party MP3 players, so this unit will be capable of that. Still going to be a few weeks before it is available though.