Surf PI Pro

[paku]

Hi Paku,

I got the same error ordering in the shop too!

Just write a direct email to silverdog and ask. That worked for me.

It might take a little time for his reply as there might be holidays in the UK at the moment.

what is the direct mail

[silverdog]

I have been away for a long anniversary weekend with Mrs Silverdog, 24yrs now , time goes so quick !
No shipping options available is normally because I am unable to ship to your country - I'm afraid certain countries have proven too unreliable via airmail or other restrictions mean I cannot ship to you country

[bernte_one]

All the best to you!

[paku]

I have been away for a long anniversary weekend with Mrs Silverdog, 24yrs now , time goes so quick !
No shipping options available is normally because I am unable to ship to your country - I'm afraid certain countries have proven too unreliable via airmail or other restrictions mean I cannot ship to you country

ok thanks

[soverey]

Just a quick update on my build and some request for troubleshooting advice.

I managed to adjust my surf pi 1.2 kit, and I was getting good coin detection at 11 inches. I decided to put it in a box, so I replaced the onbord delay pot, volume and threshold with potentiometers, also changed the R25 resistor with a 5k resistor and the delay pot with a 10k one, like in the surf pi pro schematic. After doing all these modification, I'm getting very poor sensibility, detection of coins at 3 inches, I adjusted my damping resistor so it is ok, I have volume control, threshold control, delay seems to work, I think I have damaged a component.., I did all the re soldering with the IC's in place... is it bad?. I did check for solder bridges, went over with the soldering iron over all joints, but still no improvement.
Can someone tell me please what should I check ?

Thanks.

[paku]

have you try change all you modify component to default original schematic ?

[soverey]

have you try change all you modify component to default original schematic ?

The mod should enable lower sampling delay, I would have lost audio if the sample was faster than the coil, but this is not the case, it is just a massive drop in sensibility, before it would have picked external noise interference ,but now the threshold is perfectly stable...

[soverey]

The mod should enable lower sampling delay, I would have lost audio if the sample was faster than the coil, but this is not the case, it is just a massive drop in sensibility, before it would have picked external noise interference ,but now the threshold is perfectly stable...

Any suggestions please.., meanwhile I managed to check all IC and they are alright.. but besides those I can't figure out what to check.., I fitted back all the components I have removed in order to lower the sample delay..and still no improvements.

By the way, I forgot to mention that I replaced the buzzer that came with the kit, with headphones.. but I don't think this is the reason for the lowered sensibility. And also the opamp output seemed harder to aquire on the osciloscope.. it had the correct shape but just harder to center it on the display as it was kind of moving across the display.

[Boadil]

Hi all!

I have finished building my Surf PI detector, the PCB was Surf XX which can be found in this forum. I tried using it on field, the results were good. Sensitivity to coins in air testing was about 20-27cm depending on coin size and material. When the detector was turned on in the house, with minimal treshold there was a little noise on the speaker because of electric devices. In outdoors, this noise was no more audible. The coil didn't detected the ground even without shielding, so I thought I've built a very good detector.

Then an accident happened.....

I used a poor quality wire that connected the PCB to the coax head cable connector, and somehow this crap wire broke and made the coil short - during operation.....
I removed this wire and built in a new one. When i turned the detector on the next time I realized that the sensitivity fell down about 1/2 of the original, so now the machine detects coins at about 10cm. The other bad thing what I found there is no more noise when I turn it on indoors. So the detector is still working, but it became very-very-very insensitive...
Which part could be damaged? I tried changing the IRF9640 FET, the 2200uF capacitor, 5534, 4066, 4093 and lm358 IC-s but it had no effect.
Does anyone have an idea how to repair? Should I change all the semicondutors including IC-s, diodes and transistors? I guess the resistors should not be broken.

Thank you for your attention and help, and sorry for my bad English!

the pcb in pdf format would be possible? please¡¡

[junkhunter]

new coil an old one die grinded it out re resined it 11 turns with the wire out of old whites coil works great and looks great

[junkhunter]

try changing U7 = 4066 sound amp if no sound

[junkhunter]

the pcb in pdf format would be possible? please¡¡

try changing U7 = 4066 sound amp if no sound

[multieagle]

What type batteries, and where are they housed?

Tks.

[junkhunter]

i looked everywhere and then found this $11 au .had to cut it down heaps and pop rivet ends on with sealer so its water proof cut 2 end caps and c4 auto tranny pump seal perfect size .8 aa batties

[junkhunter]

everything housed in tube and comes apart for waist belt one bolt to take apart
earphones are ear muffs with two buzzers sealed still quite loud under water on full vol