BARACUDA-Legend-1

[kt315]

gnd blue color

[GeoMax]

Deghbar613

Below is an example screenshot of one of my MD PCB designs. The red rectangle shows the placement of the large capacitor, the MOSFET, the damping resistors, and the NE5534 receiver circuit. All components are placed close together and not spread across the entire PCB. Maybe this will helps.

[GeoMax]

This is not an optimal arrangement for a ground wire, especially considering the placement of some components. Ideally, the coil connection points should be routed as close as possible to the capacitor (2200 µF) and the MOSFET (IRF9640). The 1 kΩ resistor on the NE5534 should also be placed close to the junction between the IRF and the coil lead. Position the NE5534 and the diodes near the 1 kΩ resistor. I would also connect the damping resistor directly in parallel with the coil lead.

[Deghbar613]

Hello,

I've looked at your ground trace on the circuit board. You've created a nice loop antenna there, likely picking up electromagnetic interference. That's why the signal isn't clean.

Can you show me where ?
and how to make good ground

[GeoMax]

Hello,

I've looked at your ground trace on the circuit board. You've created a nice loop antenna there, likely picking up electromagnetic interference. That's why the signal isn't clean.

[Deghbar613]

The original Baracuda design has many errors and design faults. These were corrected in the Geotech Baracuda design.
Geotech Baracuda - REV-A - Project Details

thx Qiaozhi
i am using it but not the PCB

[Qiaozhi]

The original Baracuda design has many errors and design faults. These were corrected in the Geotech Baracuda design.
Geotech Baracuda - REV-A - Project Details

[Deghbar613]

Hello Deghbar613

I've taken a closer look at your schematic. It seems to be correct. I couldn't find any errors. I suspect the problem lies with the NE5534 IC chip, its socket, or one of the traces around the NE5534 on the board. I would first check the socket and all the traces on the board for continuity with a multimeter. There might be a small crack somewhere. If everything is okay, I would try replacing the NE5534.

thx GeoMax
i found the problem
but i solve only half of it
when i change GND pin of coil close to ne5534 to green dot highlighted in this picture

thats the resulte

i know is not perfect output of ne5534 but is better
i want to know what the cause of this problem
i am sorry to bother you mr GeoMax

[GeoMax]

Hello Deghbar613

I've taken a closer look at your schematic. It seems to be correct. I couldn't find any errors. I suspect the problem lies with the NE5534 IC chip, its socket, or one of the traces around the NE5534 on the board. I would first check the socket and all the traces on the board for continuity with a multimeter. There might be a small crack somewhere. If everything is okay, I would try replacing the NE5534.

[Deghbar613]

Hi Deghbar613,

Okay, if you say the NE5534 worked on the old Barracuda board, then it's either defective now or there's another problem with your board.
I would do the following: Put the NE5534 back into the old Barracuda board and check if the IC chip still works. If it works there, the problem is definitely with the board, assuming all other components are okay.

Could you please post the schematic you used for the new Barracuda circuit board? There might be a connection error somewhere when transferring it from the original Barracuda schematic.

the schematic is geotech rev A
i modify little things highlighted in this picture

[GeoMax]

Hi Deghbar613,

Okay, if you say the NE5534 worked on the old Barracuda board, then it's either defective now or there's another problem with your board.
I would do the following: Put the NE5534 back into the old Barracuda board and check if the IC chip still works. If it works there, the problem is definitely with the board, assuming all other components are okay.

Could you please post the schematic you used for the new Barracuda circuit board? There might be a connection error somewhere when transferring it from the original Barracuda schematic.

[Deghbar613]

Looks like fake NE5534 IC...

hello GeoMax
Ne5534 is Not fake ,i am sure about that because i use it in old barracuda pcb and it work perfect
I made this new pcb to add cermet resistance to control second sample ,and i hade this problem i dont know from where it come but i think its from +5v i change all components but nothing change

[GeoMax]

Looks like fake NE5534 IC...

[Deghbar613]

hello evryone
i need help
first i want gives some info
this is my PCB

this flyback

this ne5534_pin3

here is the problem
ne5534_pin6

when i remove R8(22K) i get this on ne5534_pin6

ne5534 not fake
please any help
thx

[kt315]