Garrett (pulse) XL 500

[ripsdevala]

I make alot of mistake, its already 4 wrong component and 1 short, ...... still get hot.....
Any clue why i get -6.2v on 555 pin3, +pole as ground

[blobber]

Reptooyep, did you found the reason for the missed output signal pin9 of 4066?
Could it be, that you there have a short circuit in your second layer in top of your board? Maybe with sens.1 under the 324?
What's happend, when you cut the layer after pin9, do you have any signal there?


I had already checked the file, I found no further mistakes.

[blobber]

Yes you are right about measurement, after recheck, I agree the ground has to be battery plus...sorry.

[reptooyep]

I'll test your way, in fact, with the oscilloscope, the gnd does not matter cause i moove up and down the signal
To see it on the screen. The reference does not matter.
I'll show you my scope view tonight. I have a nice 400hz on pin 6 of 4066. The pin 9 is too low, i think it can be due to my bad quality 22nf cap.
Do you think a 10nf ofr 47nf will do the job ?

[blobber]

Around 4066 there are no 22nF caps, which you mean? Around 324, but here you said, the circuit is already working.
I don't understand, why you can get no signal from pin 9 4066....

Your values are correct? 15k and 100nF near pin 6 and8 from 4066?
When I put the signal from pin 6 to pin 9, I have a bad loud sound too, but no target signal.

[reptooyep]

Around 4066 there are no 22nF caps, which you mean? Around 324, but here you said, the circuit is already working.
I don't understand, why you can get no signal from pin 9 4066....

Your values are correct? 15k and 100nF near pin 6 and8 from 4066?
When I put the signal from pin 6 to pin 9, I have a bad loud sound too, but no target signal.

Hi,
I'm tired of this board... I mean the 22nf between pin 94066 and the base of the darlington. I does not explain why my signal is low on pin 9.
I noticed something :
The 2 commands from 4538 are not the same voltage :
4066 pin 5 = 5 volts pulse
4066 pin 13 = 3volts pulse

That can explain why it's so low at the end of the sound generator cause it comes from pin 4 and 6 of 4538 (same as 13 from 4066)..
What do you think of this ?

I put a socket for the 4066.. i'm tired unsoldering chips.

[blobber]

That could be..but with other 4066, you have the same voltage? If so, it is possible, to look for other springs of mistakes.

When you change caps, I would increase values.

[reptooyep]

I make alot of mistake, its already 4 wrong component and 1 short, ...... still get hot.....
Any clue why i get -6.2v on 555 pin3, +pole as ground

According to the schematic, if you mean the right 555 (charge pump) and taking battery + as the measurement GND, finding -6.2v seems coherent cause with 12v battery and half duty cycle ..
The other 555 output, you should read about -0.5 or less cause the duty cycle is very very small ..

[reptooyep]

That could be...

I've checked your oscilloscope views and you have about 4volts peak for the two signals.
I'll check datasheet to explain why it's lower ..

[ripsdevala]

According to the schematic, if you mean the right 555 (charge pump) and taking battery + as the measurement GND, finding -6.2v seems coherent cause with 12v battery and half duty cycle ..
The other 555 output, you should read about -0.5 or less cause the duty cycle is very very small ..

Good morning,
Yes its charging 555, so theres no problem with my 555, i will get some of it again to make sure. So there is no conection with bc548 get hot right?
And for 78l05 i will get some replacement...

And about prometeus mr.fred explain, when i make the circuit diagram, i see output of 555 pin 3 is 12v dc (max) not -6.2v, or maybe i dont know how its work, please take a look:

https://youtu.be/Xahp9NXD1r0

[blobber]

My simulation gives me pin3 555 9,5V p-p.
What do you read, when you put there in parallel pin 3 to olus battery, an AC volt-meter? With DC volt-meter I have there an always changing signar, I think because, this is not a real simulation, the frequency is too high, for CPU. I had this message below in the programm.

[ripsdevala]

With AC volt meter its read 12v, then down...down and down, with DC voltmeter have the same maner, changing every time.

[ripsdevala]

Just change 555 and 78l05 with new one, same result
Pin3 -6.5v, 78 out 3v....
(Change 78L05 with 7805)

What is it preciusss......

[ripsdevala]

[ATTACH]36966[/ATTACH]

I think i should make a new board, what do you think about this one..

[ripsdevala]

My simulation gives me pin3 555 9,5V p-p.
What do you read, when you put there in parallel pin 3 to olus battery, an AC volt-meter? With DC volt-meter I have there an always changing signar, I think because, this is not a real simulation, the frequency is too high, for CPU. I had this message below in the programm.

To get 5v on 7805 output, i need 12v on pin3 555 (-pole ground), acording to prometeus. You have 10v batt, pin3 is 9.5 (near 10v).
Now i get 5.7v on pin3 (-pole ground), how to make it near 12v?