New bara with no sound. Problem ahead.

[Psyborg]

I can try tomorrow morning put a speaker instead of a buzzer.
Must be at the exit of the coil some voltage ?

[Koala]

Have you got a small speaker you can try instead of the buzzer I do remember someone having a problem with the buzzer recently.

[Psyborg]

Threshold pot is on the place.

[Koala]

Check the value of the resistor bottom right near the h in the word threshold just above the capacitor I have a different value there but the board is slightly different

ignore this I have use a 4 band your is correct can't see anything obvious with the components that are lying flat to the board

[localbug]

Where's the threshold pot??

[Koala]

Check the value of the resistor bottom right near the h in the word threshold just above the capacitor I have a different value there but the board is slightly different

[Koala]

is that same if replace
2N5485 with BF256
and
MPF102 with BF245

IRF should get quite warm but not red hot if its pulsing correctly. Not sure if you can measure safely with your PC scope

I used 2N5485 in all three locations and it worked fine

Will have a look at your photos later.

[paku]

is that same if replace
2N5485 with BF256
and
MPF102 with BF245

[Psyborg]

@ Thomas
40106

[Thomas]

CD4060 pin8 - pin 16 =5V

? 4060 or 40106

[Psyborg]

Yes i have.

[silverdog]

Start with the simple, do you have +5v and -5v at the output of 78l05 and 79l05 ?

[Psyborg]

[Psyborg]

Here it is.

[jladre]

Post a photo of your board that maybe we spot the fault.