Whites Surf PI schematic

[homefire]

Yep, Amplifying tons of Noise on the wire.

[kt315]

you have to use shielded cable for the pot anotherway you get strong unstability.

good luck

[homefire]

??? Don't know. Save the cost of a Pot? LOL It's not like a VLF needing to Tune Down to handle Ground conditions I guess. The Surfs not the deepest of PI so no need to turn down to stop digging 2ft holes for fishing weights ? I have a untouched Silver Dog kit sitting here Idle. I'll put the Pot on just because I can.

[chemelec]

Easy Enough to do. Replace the Feedback Resistor 1M on NE5534 to a Pot.

Not tried the Motion no Motion mod. It didn't keep the Threshold Tone going any longer ?

Yes I Know it is Easy to add that Gain Control, but why don't they add it in their kits.
Is it useful or not?

[homefire]

Easy Enough to do. Replace the Feedback Resistor 1M on NE5534 to a Pot.

Not tried the Motion no Motion mod. It didn't keep the Threshold Tone going any longer ?

[chemelec]

Yes it's a motion detector. I think there was a mod to fix that.

Why do most of the Kits available for this, Don't have the GAIN CONTROL.
Is it Not useful?



ALSO, I HAVE TRIED THIS, BUT IT DOESN'T SEEM TO MAKE ANY DIFFERENCE

[cagatelorito]

Thanks again!!!

[homefire]

Yes it's a motion detector. I think there was a mod to fix that.

[cagatelorito]

Please another question, I got to start the surfmaster and it detects a coin of euro next 25-28 cm, and ring of gold 12-14 cm, I think its good but if I keep de coin when it is beep and don´t move it after 2 or 3 seconds stop beeping and is necessary to move again, that is normal?...

[cagatelorito]

Thanks!!!

This should help.

[homefire]

This should help.

[cagatelorito]

Please, I need a little help,
how do I adjust R10 without osciloscope? What is the value?
Thanks

[württemberger]

This was my build...

[cagatelorito]

Good morning and cordial greetings,
I´m new in this foro and I have a little question, there are many schematics, pcb´s, modifications and discussions about Surf Pi but is very dificult to find which is good, best or ultimate...can someone tell me the most advisable option?
Thanks !!!

[eclipse]

hello Ashkelon,

NO.........
values of C4 / R12 are just fine,

experimented with changing the values in the past,
and,
although not TO critical, 10k and 100nf seen to work the best.

Some schematics use 10uF/20uF (ESR < 0.05R) cap and 100K resistor.
You can try these values if you feel like experimenting, although guys will say electrolytic cap is source if noise