Garrett (pulse) XL 500

[ripsdevala]

Your mpsa13 orientation is diferent with mine, is this the correct one?
I got 12v on all pin 78l05??
The ground 78l05 have 12v directly from battery..... Are u sure?

[reptooyep]

The orientation is wrong, according to the schematic.
When you look at the transistor in front, left is Emitter, right is collector.
Mine is different cause BC517 is reverse.

But your orientation is good.
I don't remember using MPSA13 in TGSL ?

[ripsdevala]

I mean barracuda.... Mr.fred mpsa13 orientation is my oposite, take a look.

Sorry missreading, you right its wrong oriented.

[blobber]

Exactly, your orientation is correct. I think, that I have not MPSA13 there, but I can not see, which type it is. Anyway, I hope you will have success.


Which output shows your right 555 in Volt and kHz? Or have you fixed already your power problem?

[ripsdevala]

Exactly, your orientation is correct. I think, that I have not MPSA13 there, but I can not see, which type it is. Anyway, I hope you will have success.


Which output shows your right 555 in Volt and kHz? Or have you fixed already your power problem?

Not yet, still got 12v on pin 3 555 and it have 0.4hz
.... I hope there is instant message here....

[blobber]

This is strange man...have you checked all components around 555?
220pF, 39k, 1k, 820


When you remove 820, you should have 65kHz, on pin 3 of 555.

[blobber]

Reptooyep, I miss some capacitors in your pcb, or are you using smd parts?


Your output 14 of 324 react with target, good. What shows pin 9 of 4066?

[ripsdevala]

This is strange man...have you checked all components around 555?
220pF, 39k, 1k, 820


When you remove 820, you should have 65kHz, on pin 3 of 555.

I have 5.7v on pin 3 at this 555

[reptooyep]

I put 3 100k resistor and 3 1nf caps SMD cause i'm having trouble with bad quality caps from china.
I think i will make a new SMD layout when my unit will work..
The problem comes from the 4066, the output pin 9 is too low, i don't havd a good 400hz signal on this output.
I'll try tonight with a new one cause i put a vintage chip from the 70s.
I can test with tousands of transistors, it won't beep untill i have a good signal pin 9.

[reptooyep]

I also replace the bc517 by 2 mpsa42 wired as a darlington... but still no sound cause pin 9 is bad

[ripsdevala]

Now i get 14v on 78l05....


Im short of 78
Can i use 9ne of this

[blobber]

LM317, but you have to add 2 resistors and also change the connection, to get 5V..... I would not suggest to do it!

[ripsdevala]

LM317, but you have to add 2 resistors and also change the connection, to get 5V..... I would not suggest to do it!

I dont know what to do now, that 78 and 79 is new, already tried with 3 of them.
But strangely... 79 out is 7v not -5 and 78 stuck at 14v for now, all pin is 12v when i pick the 78l05, i dont know is this normal or not, even the jumper beside 78 out have 12v when i pull it from pcb..... Omg maybe i have bad knowledge in electronics.... Mr.Fred, Reptooyep, let me have a sleep, thank you very much for the support.

[Xtrem]

I think you messure wrong, GROUND point is + PLUS pole of Battery.
If you mess from the minus pole of battery ,then the 7905 is ok to have +7 Vdc, but the 7805 must have +17v , not + 14.

[blobber]

Well, I was playing for a while with Proteus simulation programm. So it should look and work...