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Offline Jiminy
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« Reply #10 on: April 28, 2011, 01:49:06 pm »
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Xavier,
I'm also interested in this mod to the Surf PI from Silverdog.  I built the kit and am in process of making the coil.  What exactly does it do?  It's unclear from the above posts.
/r
Jiminy

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« Reply #11 on: April 28, 2011, 01:59:46 pm »
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This MOD just allows detection NO MOTION for pin pointing.

The switch funtion is listed back wards on this .



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Offline xavier
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« Reply #12 on: April 28, 2011, 04:58:59 pm »
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Thanks Homefire I was looking for that LOL

Regards Xavier

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So many questions so little time
Offline Lord DraconTopic starter
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« Reply #13 on: April 29, 2011, 07:22:12 am »
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Thanks for posting the pinpointing switch function. However, I have noticed there are two versions  UndecidedIdea. First one using an open circuit breaker to force the pinpointer function (yes i noticed the open and closed descriptions are backwards Grin) and second being a switched resistance type using a 1M ohm resistor. Which version is the best? I would probably go for the second as this would have less an effect on the IC's? or does it not really matter?

Another point i would like to ask about is, I have seen reported is that transistor Q2 (TIP32C) can be prone to overheating and its suggested to replace this with a IRF9640 MOSFET, is this the case? as i would like to keep this operational for a reasonable amount of time?

Thanks for all your help, i'll get all the parts/kit ordered soon, so i can get on with the build. (I might post my build progress in stages for others to see.. just have to see how much time i've got available ... might be a slow build  Undecided )

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Keep searching ... you might just find it.

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Offline xavier
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« Reply #14 on: April 29, 2011, 10:15:03 am »
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This build will only take you a few hours.

Regards Xavier

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« Reply #15 on: April 29, 2011, 10:37:03 am »
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Dragon, Silver dog uses the IRF.

Yes, I too am going the route with the two Resistors.

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Offline xavier
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« Reply #16 on: April 29, 2011, 01:06:48 pm »
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There is no need to change any thing on the detector apart for the additional resistor for the pin pointer. If the IRF starts to get hot then there is a problem with the coil.

Regards Xavier 

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Offline GoldDigger1950
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« Reply #17 on: April 29, 2011, 03:55:57 pm »
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Mod B is the best option. The open circuit Mod A might cause instability in the first stage op amp LM358. That 1M resistor will keep that from happening. The capacitor would isolate it in a perfect world but the opening of the switch causes a change which will be fed back via the capacitor. The effect is that you defeat the capacitor isolation momentarily. The resistor in Mod B reduces that issue to nearly zero.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
Offline xavier
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« Reply #18 on: April 30, 2011, 04:14:36 am »
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Yet another wonderful explanation by GD  Smiley

Regards Xavier 

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Offline GoldDigger1950
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« Reply #19 on: April 30, 2011, 03:42:20 pm »
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Thanks, Xavier. One other thing I forgot to mention and I'm sure you'll agree is that any mods should wait until after the project is working. You and I both had a few issues to deal with before it was working correctly and adding a mod only increases the likelyhood of inducting a problem.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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