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This schematic is posted on this website. Can anyone figure out if it is possible to change the preset discrimination. This circuit board is set for discrimination of everything under the zinc penney. Is it possible to reset it to accept foil and U.S. nickels? There are no controls for variable discrimination. Thanks Joe
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I'm thinking you could do it with the Analyze setting. Vr3 Have you tried adjusting that ?
D - Gardiner202a.pdf -
The Analyze setting only adjusts the sound....the discrimination setting has been pre-set from the factory to accept zinc penney's and above. The only other mode is all metal which accepts all metal. Most discriminators that I have seen that have been pre-set have a trimmer which can be adjusted but on this model I do not know which one could be the trimmer? Thanks JoeComment
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Has to be something right in that area. Everything behind that is just amps it looks like. Is S10 the selector switch for the descrim ? If so one of those Resistors is setting the Descrim level.Comment
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Joe (Tx)
Robert Gardiner designed the Gardiner 202A and the TreasureTron C to be used hunting gold nuggets. Since the gold nuggets are usually higher in gold fineness content then a 20Kt ring, the discriminator was set up to reject everything below the zinc U.S. Penny. Thus it will go into a park area and not pick up any trash below the zinc U.S. Penny. Changing the discrimination settings would destroy its usefullness for searching for gold nuggets.
Now if you decide to do it, I would set up a separate toggle switch that would tune in the same settings you now have, and with a flip of the switch, change the discrimination settings into a mode that would find the U.S. Nickle and above. But then it would not be very good as a discrimination detector.
Then one would have to put in an adjustable pot for a resistor replacement value, in order to move the discrimination up and down, to a place where one would be satisfied.
It probably would, in my opinion, to keep this one as it is, and find another Gardiner or other brand name detector, that would move the discrimination up and down.
The answer is that the Gardiner model 230 has variable analyze 2 mode...
Anyone have a schematic for the model 230 detector?
Melbeta
MelbetaComment
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Melbeta, Thanks.At the time that I originally started this thread I was zeroing in on a 2nd 202A. Unfortunately that deal fell through! I would probably try doing a discriminator set up on a non-functional 202A...that is, get it fixed and then added the discriminator pot. No use messing up a perfectly good 202A. I am a long ways from any of the gold fields so messing up the detector for the gold nuggett problem would not be a problem for me!Comment
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