Surf PI Pro

[geoscash1]

Ok that's what I thought, I personally like that audio type better myself and really have a hard time with piezo type buzzing.. if you can get that info I'd be interested as well.. Thanks for the reply..

[walkman]

Hi friends; my surf pi pcb ( specially for geoscash1 )

[geoscash1]

Thanks Walkman, nice job...

[sinclairuser]

looks nice,is it final?

[Harp]

Please reference, which is the temperature of the MOSFET, and which the temperature of the "damping resistor" during normal operation of the unit SurfPiPro.

I see that on the original scheme no potentiometer for Discrimination (pulse delay), and there was on the SurfPi unit. By searching the internet, I found on the contradictory information, and I stopped to believe anyone about it.
Some say that discrimination does not exist on the "PI" device, others say that there is - I'm interested in the official attitude of the constructor, and the result of their investigation: whether there is discrimination, and if so, why is fixed at SurfPiPro model?

[kt315]

why is fixed at SurfPiPro model?

simple reply because Surf Pi is waterproof underwater detector, for diving. every diving component is expensive on 5 and more times vs ordinary components.
and yes there is economy on pots. because those are not simple pots, those are waterproof pots.

[porkluvr]

I had to see for myself. Kellycodetectors.com has a picture showing a "Pulse Timing (DELAY)" potentiometer and on my copy of the Surf PI Pro schematic there is a 10k pot right before U6C.

Would that not be the primary sample delay feature?

[kt315]

I had to see for myself. Kellycodetectors.com has a picture showing a "Pulse Timing (DELAY)" potentiometer and on my copy of the Surf PI Pro schematic there is a 10k pot right before U6C.

Would that not be the primary sample delay feature?

Eric Foster's mod re-moves DELAY pot in S.A.T. pot place. you look at the schematic and do not see the mods, WHY? DELAY was FIXED (on 15us) - because THE POT was re-located.

[farafero]

Hello, I apologize for asking but I made the board with all components and there is no sound, can anyone tell me how I can check the board or something?

[porkluvr]

Hi friends; my surf pi pcb ( specially for geoscash1 )

If I am not mistaken, what you drew is actually for the Surf PI Pro. That's good because we are not drawn off topic, but it is bad because you have mislabeled your work which is bound to create even more confusion than what already exists.

We already have about three versions of Surf PI to try and keep straight (not counting the pro model). Why didn't you call it what really is? What is the name of this thread?

[jfais1717]

Hello, I apologize for asking but I made the board with all components and there is no sound, can anyone tell me how I can check the board or something?

I had a similar issue when I first made mine. It ended up being a bad piezo buzzer. I replaced it with a new one and it fixed the issue.

[farafero]

is there a way to verify integrated circuits?

[porkluvr]

is there a way to verify integrated circuits?

Why don't you show us a few pictures of the board, from different angles?

If you have a multimeter you will need to verify that your power supply voltages are correct. Do you need for somebody to show you how to do that?

[farafero]

http://pics.data.bg/categories/1/%D0...4ae323a2065/1i
http://pics.data.bg/categories/1/%D0...e7d9852976c/2p
http://pics.data.bg/categories/1/%D0...acbe347ab80/3v
Here are a few photos, where to measure with a multimeter?

[porkluvr]

Yes those are photos... I was hoping we would get to see photos that were IN FOCUS so that somebody could possibly identify the different components. I can't tell one resistor color from another.

Sorry, but those pics are mostly useless.

edit: Meanwhile, try and make sure that none of the solder on the back of the board is bridging any two adjacent traces. Make sure traces are soldered on top AND bottom.

By the way, when soldering, more solder is not usually better than less solder, it goes the other way around. You should make your solder connections look nice and neat. Do NOT use excess solder on the joints. Use only enough solder to make a nice neat joint. Then make sure the PCB is cleaned well (spotless is good) with alcohol or something else made for removing flux.

Solder flux should not be allowed to cake up but should instead be cleaned pretty much as you go along... hour by hour, not day by day.