Would this Cibola Mod work?

[nebdirtturner]

I read a post from akille8 from Feb 2010 here on findmall about his super duper Cibola mods with GB, all metal switch, and dual discrimination. I am interested in getting the dual discrim, I am doing the manual GB tomorrow. Basically this is a Tejon that he has made, but I think you will get a better discrim on iron with the Cibola, so that is why I purchased it so I can get a Tejon on the cheap after the mods.

My question for the whiz kids here is this. Instead of a seperate second discrim pot, could one wire a simple switch with a resistor that coinsides with the reading of a copper penny, so that you are using a second "non adjustable" disrimination attached to the switch? As an example you set your discrimiation to nickle but have the resistor set at the copper level, you get a beep you flip the switch if the beep stays it is copper and above. I hope you follow my thoughts. It would be cheaper and take up a lot less room, I just don't know if it can be done.

 

[sweepdog]

have you checked a few posts down on the silver sabre triple discriminator mod?

 

[nebdirtturner]

I saw that one but it used pots, albiet small internal ones would probably be the way I would go if the "switch disc" idea comes up short.

 

[Rob (IL)]

The resistor idea could work but it would take too much fooling around to get the exact point just right. After all that's all a pot or trimmer is.