Surf PI Pro

[ApBerg]

Remove all IC's but leave the ICL7660 on the pcb, then check how much current the pcb is taking from the battery ,must be less then 40 mA ,
and check if you have + 5volt and ca. -4 volt on the IC sockets look at the color bmp

Tell the results ?

[paku]

Ok this Is Clear Picture

[seadoggy]

paku check your C5 220n and C6 220n,i can see in your image above you make direct connection whit tin or copper,pls clean board and put clean image

[paku]

I cannot make the sound gone with the tresh pot,
can you show me sample of tresh pot connection and I removed the NE5534 but it still make sounds
I use 9 volt battery,
yes T1 i use 2N3906

[ApBerg]

Hello Pau,

Looks nice... can you tell how much current the circuit take's from the battery ?
Can be your tresh- tune pot is wrong (connected)..... you can not make the sound gone with the pot ?
If you remove the NE5534 from the board is the sound gone ?
Look also at the pcb side, at the caps under the LM358.. looks like a wire from a cap is making connection to a other cap.. cut the wire's fot the caps a little shorter
T1 is a 2n3906 ? if you use an other one check the ebc connections.

Succes

[paku]

This Is My Board





did i make mistake

[paku]

I Have Finish My Surfxx but when i put the 9v battery i just get only beep long beep

[paku]

Can I use a potentiometer at trimpot

[paku]

Ok Thanks Brother

[joop]

You need to experiment

[paku]

so if i put that 3.3k resistor its will work on my right coil?.
or i must use the 5k trimpot to set that coil

[joop]

It will work okay with a 3k3 resistor... When using a trimpot you can change the dutycycle of the 555 which modifies the pulse width. Depending on your coil you can set the pulse width so you have both the lowest battery current and best depth range.

[paku]

so that is not 3.3k Resistors right

[Carl-NC]

It's a trim pot.

[paku]

somebody please help me explain about R2 is 5K (3.3) What is that mean



somebody please help me explain about R2 is 5K (3.3) What is that mean