Give me a single panel Surfmaster PI (White's) / PCB

[silverdog]

Silver

You can test 7660 output with DMM, put black lead on battery negative, red onto 7660 pin 5, post your result, also post 7660 pin 8

what speaker are you using ?

[silver]

Hi Cricti71 , silverdog and thanks for your fast reply
i will do that and i will post my result here as soon as possible.
regards

[bklein]

Hi cristi71 and silverdog
thanks for help
today i made 350uH coil but no difrence yet!, first that i installed the pcb, the BC337was incorrect installed and did very hot but i chenge the legs and it work so can problem in BC337? may be burned? and other thing, my BC327 is BC32725 ; i use 10k for thrshold and 100k for P1 and Delay and 1k for volume. other thing is true according to oxygen07`s layout. one thing: i use 240pf for C17.
i dont have scope so can you tell me how i should chek power-5v (icl7660)? can you please explain this dear cristi71? can i use a DMM?
dear silverdog
i today test my surf with 12v but no difrence yet. every opinion maybe can help me to solve this problem.
again thanks for your helps

I think something is wrong in your component placement or selection. First, start with a wall adapter for power so you can eliminate the battery as a factor. A 9V battery is ok for sourcing small current for long periods but lousy for high currents - it will have drop due to its own source resistance and even your 9V won't be 9V... Your TX signal will be too weak and your voltages will quickly drop in amplitude - then all your pot tweaking will be wrong. Everyone running at 12V knows that as the battery voltage drops the performance becomes very bad.

Now, say you are using a car battery or wall adapter (12Vdc out) for 12V. Verify your 5V regulator and fet still get hot. If the fet gets hot, take the coil off the circuit so the fet is not loaded. Now figure out what is wrong. Verify you have plus/minus 5V out of the 7660.
Probably not as it can't source much current. So feel the various chips on the board and pull out the hot ones. Look at them to see if you had in backwards. If nothing wrong there maybe your 555 is not oscillating. If you have everything in sockets you can put parts in sequentially checking for changes in the power voltages. Start with the 555, then cmos ics, then 5534 and then 358. Don't use headphones or buzzer or speaker through any of this as maybe its the problem too.

[silver]

Hi to all
the current consumption is about 240mA and voltage of pin 5, 7660 is: -8.71v and pin 8 is:11.54v ; and i am using one NI-MH 9V+ LI-ION 3V in series that give me 12v but in fact when i chec with DMM it was 13.05v.
i will do what you say dear bklein and i will post here the result.
many many thanks to your helps cricti71, silverdog and bklein
silver

[silver]

... my test with 9v battery( in fact 9.8v):
pin 5: -8.77
pin 8: +9.05v

[bklein]

Why are you guys playing games with batteries? Just get two fourAA holders, put em in series and you are good to go with the intended alkalines. You won't get the performance and duration you want with 9V battery variations. Lipoly and NiMh are fine but don't mix them...

[cristi71]

hello, 78L05 is defective and must be changed. on pin 8 icl7660 must have +5 V current is very high and 240ma .. should change 78L05 first of the 8 pin icl7660, 5v. there's something wrong again check wiring. regards..

[cristi71]

78L05 check again if it's positioned correctly.

[silver]

Hi
ok bklein
to cricti71; thanks , i want a few time to chenge the 78l05 and check the wiring again, and i will post the result here.
regards
silver

[bklein]

I don't agree that there is anything wrong with the 78L05. If it has 5 V out and >8V in it is fine. BTW, remove the 390 ohm resistor as well as the coil to check power draw.

[silver]

Hi bklein
i removed the 390 ohm resistor and coil, and connect 12v battery; it was 11.78v out and same voltage in of 78L05 so i thing i must chenge the ua78L05 but in my city it is very uncommon ic, so can i use L7805 because it is common here!
i change BC337 and BC327 and the BC337 is correct conected but is become heat yet!!!
Thanks for your helps

[silverdog]

yes L7805 is ok

[silver]

Hi silverdog and thanks for help
silver

[cristi71]

dear friend, Silver says that the pin 8 icl7660 are 9v. icl7660 pin 8 is connected to Vout 78L05. Vou7 the 78L05 5v should be, something is wrong there. icl7660 is right, receives 9v, out-9v. 78L05 or is broken or something is not right to pcb. regards..

[bklein]

Are you sure you have the two transistors in the correct locations?
Sort of sounds like you have them swapped.
If your 5V regulator outputs 12V and is shorted, you likely
damaged some other parts too.
I advise you to pull out the ics if they are in sockets and start with the ICL7660 having the right output voltages, then put in the 555 and verify it is oscillating. Maybe use an audio amp input to hear it if you can't get a scope. Then put the CMOS parts back in and audio trace them too. The first 5534 should have be biased half way between positive and negative voltages on it, using the trimpot. The LM358's should also be approximately that dc voltage on their outputs. It matters what you connect the output to in terms of its impedance. If it is a speaker it will cause the transistor to draw a lot of current. The origiinal design has a transformer to work with headphones. Using a single transistor to drive a speaker is not good - too much current. Maybe it is intended for a piezo speaker like in toys and those cheap greeting cards... that could work.