help with surf pi, trying to make it work!!

[pavlos_x]

hello everyone, am new at this, am currently building a surf pi from silverdog and i need some help, i assemble the pcb,
i get on ic 7660 pin 5 -5.06v and +5.06,
am trying to adjust offset to give 0v at TP2 (ne5534 pin 6)
Am putting red on tp2 (or pin 6) black on ground, I turn pot for offset and nothing happens. i have reading 1.92v. can i get some help?? Tp2 is 0.92v
Coil is 20cm diameter, 17 turns 1.5ohm, coppers wire 0.5mm or 0.3mm am not sure, shield. I also have an antenna coil
I also have an antenna coil 20cm diameter, 24 turns 3,3ohm.

[Nezocas]

Hi,

Red lead on TP2 (pin6 of 5534) and black lead on battery ground output
Have you made the jumpers near R5 R8 and C6

[pavlos_x]

Hi,

Have you made the jumpers near R5 R8 and C6

yes everything is in order .

am trying to attache or paste my photos but it keeps saying The connection was reset

sorry. thanks for replying

[Nezocas]

Upload them to photobucket and them copy the link and paste it in your topic reply

[pavlos_x]

http://s1161.photobucket.com/albums/q516/pavlos_x/?action=view&current=1.jpg

http://s1161.photobucket.com/albums/q516/pavlos_x/?action=view&current=2.jpg

[pavlos_x]

[Nezocas]

Does your IRF body touching the ground jumper wire

[pavlos_x]

Does your IRF body touching the ground jumper wire

no no its ok.

[ApBerg]

no no its ok.

Hello Pavlos.

The best you can do first is to clean the solderside with cleaning alcohol, then check your solder work carefull ! On the photo it looks like that it needs some inspection ?


Best regards.

Ap

[pavlos_x]

i cleaned everything, everything seems to be in order. i was talking with silverdog and he said

''Measure voltages on Ne5534 pins 2 and 3, when metal is placed in coil there should be some change
If you see change at 2 or 3 but not 6 then 5534 is faulty
If you see no change something is wrong in coil circuit, irf9640, 555, 2n3906''

so this is my response


''No changes at all, I checked for pin 2 + 3 voltage is 0.37v (same for both with or without metal in coil) 6 is 3.55v (before it was smaller 1.92v I don’t know what happen and it got higher).''

i went and i bought the parts again, am waiting to see if am gona change them or not, all of these happened because i had some ic's in the wrong way

[pavlos_x]

does anyone now or have a chart on what voltages i should be getting in each component?

[ApBerg]

does anyone now or have a chart on what voltages i should be getting in each component?

With coil connected the current taken from the power supplay has to be around 50 mA have you checked that?

[pavlos_x]

i have 90mA

[ApBerg]

i have 90mA

Thats to much... if no audio is on ! . Best remove all IC out there sockets ..accept the ICL7660. Then check if you have the right volts on the supplay pins from the IC's has to be , +5 volt and -5 (wil be lower I think , ca. -4V as I remember)

and see how much current is taken without the ic's

[pavlos_x]

without audio i have 0.37mA. with no Ic on i have 0.01 mA and onthe pins 6 and 8 i have -5.08 and +5.08