Baracuda broken

[Andi68]

Yes i did and the mod you've shown , too.

[kt315]

rebult what? did Qia's mod?

[Andi68]

Yes , they are working.
The IRF gets beetween warm and hot

[Koala]

Are all the supplies working

78L05 output 5V
IC7660 output -12v
79l05 output -5v


Does the main FET get hot or warm after a few seconds of use

[BKY1337]

Can you make a picture of your pcb from both sides?

Im not sure but google says BF247 is NFET , are you sure that you can use it as a replacement?

[Andi68]

I've rebuilt the circuit and the problem is the same again - now I'm at a loss as to what could be the cause.
40106 I have exchanged, BF247 installed .....
Does somebody has any idea?

[Andi68]

https://www.youtube.com/watch?v=F-o97JCQtes

If this test is correct, all my 2N5485 are useless, I bought them in China

[Andi68]

I had a signal on the MPSA13 ....
But I was so angry that I destroyed the board, now I have to start from scratch.
When first turned on the 1054 smoked, I do not know why, I could not find a cause for it ...

[kt315]

ok. then will begin again from start.

1. you do not have DC voltage on a base of the darlington transistor
1.1. disconnect the base from the schematic and connect it on PLUS power via resistor 10-100kOhm. you must hear the sound
2. you do not have modulated signal from generator
2.1. check the signal by o-scope.

[Andi68]

Clear like a fog

200V pulse, clean signal on 5534, delay correct but no sound ...

[kt315]

what is audio... DC voltage modulated by outer constant generator signal. DC voltage is THE reaction of detector on a metal.

IS THAT CLEAR FOR YOU?

[Andi68]

Damn, I'm trying again, so far I've got every circuit working.

For the most part the circuit worked, only audio did not work.

[Andi68]

Then I probably made a mistake.

I give up the project.

[kt315]

https://www.youtube.com/watch?v=EvSwGobCBm8

[kt315]

if i do something i AT FIRST test it and only then i offer to release. you see - i do not offer opamptester board BEFORE i test it MYSELF.
also, i always give a video with the working device. try change 40106 and do George's mod. modern 'chinese' 40106 may be not working with two supplies.
i say again - MY BOARD IS SURE PRECISEST COPY OF ORIGINAL BARA BOARD.