New bara with no sound. Problem ahead.

[Psyborg]

I built baracuda from silverdog with original parts. I turned on and nothing happens, not a sound, not a beep. I noticed that the IC 7760 very warm. So I look all components and discovered that is IC LF412 is wrong inserted. After correction the heat of 7760 is gone. But still no sound.
I use 24cm diameter magnet wire coil with 400uH, 1.3 ohm.
Is maybe now 7760 faulty? Don’t know what to do? Where to look?

Help! Please.

[Koala]

measure voltage pin 5 of the 7760
and outputs of the 79L05 and 78L05
Would be a start

[Psyborg]

Status of my nonworking bara:
baracuda is connected to 12V lead acid baterry

79l05 In=10V
out=-5V
78l05 in=12V
out= 5V

TC 7660 Between pin 8 (V+) and pin 3 (gnd)=12.6V
Between pin 3 and pin 5= -10V

LF412 Between pin 8 (V+) and pin 4 (V-) = 10V
Between pin 4 and pin 1 = 5V
Between pin 4 and pin 7 = 1.5V

NE5534 pin 4 Vcc - pin 7 Vcc+ = 10V
pin 4 Vcc- pin 7 Out = 1,43V

CD4060 pin8 - pin 16 =5V

[Koala]

Good news 7660 survived

Do you have an oscilloscope ?

Check you have installed the 2n2222 correctly don't trust the legend on the board as some have different pinouts

[Psyborg]

I check pinout of the 2n2222 and is correct.
I have an PC based oscilloscope. Never work before with oscilloscope. Where to measure?
I'd like to have the original scheme of the baracuda from silverdog.

[jladre]

Try turn 2n2222a 180 degree.. bara produce sound even without coil.

[jladre]

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

[Psyborg]

Here it is.

[Psyborg]

[silverdog]

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

[Psyborg]

Yes i have.

[Thomas]

CD4060 pin8 - pin 16 =5V

? 4060 or 40106

[Psyborg]

@ Thomas
40106

[paku]

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

[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.