Surf Pi Professional Pcb's back in stock - NEW Prices

[plumabob]

OK Silverdog,

It's working correctly now. I do have a scope. How would I go about hooking it up and tuning the board in for max performance.

Thanks

Bob

[silverdog]

Bob

have a look at this thread http://www.geotech1.com/forums/showthread.php?t=17240

Silverdog

[ApBerg]

"but if you use the tune potentiometer then you must get a point that is giving a continuing sound"

Yes there is a sound but it disappears after a short moment maybe a half second. Sounds like it drifts away. Should i use a fine tuning Poti with more turns? The on i have can only be turn in an ancle of 270 degrees maybe thats not fine enough.

No need for a multiturn potentiometer, if your sound drifts... check the E caps if they are in good directions on the board .. and put the other trim pots in mid position then test again ?

Ap

[plumabob]

OK Success!

Got the bugs worked out and the settings zeroed in. Using my 9 inch mono coil I can hit a nickel at 9 - 10 inches, so I guess that's pretty good. Signal is faint but I would dig it for certain. Coil specs are as follows 21awg magnet wire, .330mH and 1.26R.

With an 11.5 inch mono I can hit the same nickel at a foot. Specs as follows. 22awg teflon coated stranded wire, .308mH .96R.

Use a set of headphones to zero in your settings ...works a lot better.

Great little PI Silverdog...very happy.

Thanks again,

Bob

[N1PS]

OK Success!

With an 11.5 inch mono I can hit the same nickel at a foot. Specs as follows. 22awg teflon coated stranded wire, .308mH .96R.

Use a set of headphones to zero in your settings ...works a lot better.

Great on getting it working well. Did you need to perform any PCB corrections? Reading some of this thread and others, there may have been a jumper or two to add/fix? I have not built mine as yet.

Did you have any issues with the FET getting warm with the 11" coil?

On the headphones - I noted that several detectors use a 555 audio chip in astable mode, creating basically a voltage controlled audio oscillator...driven by the integrator chip. If I understand these 555 output detectors correctly, this circuit would give perhaps a more pleasing audio response, ...and if you drive a speaker with a transistor (or darlington pair), you would get a lot of audio output. But I am not certain I understand the 555 audio circuit as used in those detectors so I could be way off base.

Also, I plan to add a meter to detect the audio. I like a meter...it is more sensitive than the ear (especially my ears ). I have tuned receivers for years with a meter (such as AVC or S meter).

Peter

[plumabob]

Hi N1PS,

Board was fine, my adjustments were way off. I haven't noticed any heat problems but it's only been on for maybe 15 minutes or so.

Regards!

[bernte_one]

c2, Timer 555

Hello,

can i use for C 2 (standard 25V 1000uF) 25 V 2200uF and for NE555 (old) the LMC555 (newer, faster, less energy needed) ?

[Miata]

Hi,

the LMC555 is a CMOS version of the standard 555 and should be compatible.

Regards
Jürgen

[ApBerg]

Hello,

can i use for C 2 (standard 25V 1000uF) 25 V 2200uF and for NE555 (old) the LMC555 (newer, faster, less energy needed) ?

Hello,

No problem, both work. If your audio still drifts.. check C15 for good +/_ connection

Ap

[Butler]

Surf Pi kit

I am new to the forum. I have contacted you today Silverdog regarding a kit purchase.
Thanks

[bernte_one]

my finished surfboard

Hello,

here are some pictures of my finished project.
Some improvements follow this weekend i think my problems were caused by some ic´s.
I ordered the right one strictly like the partlist. If it works than better i post it that nobody take the wrong ones like me.

http://fotoalbum.web.de/gast/bernd.marten2/Surf_Pi

[Majarit]

Hello,

here are some pictures of my finished project.
Some improvements follow this weekend i think my problems were caused by some ic´s.
I ordered the right one strictly like the partlist. If it works than better i post it that nobody take the wrong ones like me.

http://fotoalbum.web.de/gast/bernd.marten2/Surf_Pi

Nice job Bernte
Is you setup waterproof ?

mine is working good now, i had to remove al the sockets to find an error under the last one on the pcb. but now everything works fine .

i need to find the right materials to make everything waterproof and if possible with neutral buoyancy.

greetings

[ApBerg]

Hello,

here are some pictures of my finished project.
Some improvements follow this weekend i think my problems were caused by some ic´s.
I ordered the right one strictly like the partlist. If it works than better i post it that nobody take the wrong ones like me.

http://fotoalbum.web.de/gast/bernd.marten2/Surf_Pi

Hello Bernd,

I see on the photo's that the via's beside the IRF9640 are "open" think it is better to fill the via's with soldertin , or even beter put a wire link over it, now... it looks strange, but I do not now how many current the via's can take, the ground from the 1000 uF Cap and coil is made with those via's. If anybody has comments.... ?

Best regards.

Ap

[Alexismex]

I am right with you.... For my part i always put a wire and solder ,i do not trust via rivets
Alexis.

[bernte_one]

Nice job Bernte
Is you setup waterproof ?

mine is working good now, i had to remove al the sockets to find an error under the last one on the pcb. but now everything works fine .

i need to find the right materials to make everything waterproof and if possible with neutral buoyancy.

greetings

Oh no my setup is not waterproof. The housing is a good base to make it waterproof. put i have the trimpots outside and they are a problem but i dont need a waterproof version.

Today i have tried to change some ic`s.
The parts that i have
build in at first: changed part result

TC7660
NE555 ILC555N other metallic sounding but no change in range
NE5534AP
HEF4066BP HCF4066BE no change at first look but 2-3cm more range
HEF4093BP HCF4093BE the range falls from 15-18cm 2Euro to 5-10cm
LM 358

at last i only left the HCF4066BE i have a range up to 18 cm with a coil of 24cm diameter from LIY0,25/1,3 with 1,3 OHM and 470microH (measured with a LCR meter) wdg? maybe 30.

Next i try a coil from copper wire 0,5mm 30 cm dia 30 wdg
should be round about 500microH http://deepfriedneon.com/tesla_frame6.html
but i hope not more then 3 ohm

Thank you for the tip with the wire bridge near irf, i have thougt about before.