baracuda rev A silverdog bad performance

[rdz28]

I forgot to say one thing, for the test I'm not using a battery pack, but a power supply with vdc output set naturally on 12V

[Andi68]

I wish you success

[rdz28]

tonight I'll try with an oscilloscope and post the images

[Andi68]

Gram of course

[green]

I do not Need a Bara any more.

I want to build a detector that finds a 1Gr gold nugget at 70cm depth

Gr=gram or grain?

I want to build a detector that finds a 1Gr gold nugget at 70cm depth

Me too

[Andi68]

I do not Need a Bara any more.

I want to build a detector that finds a 1Gr gold nugget at 70cm depth

[kt315]

I built the version of kt315 and at 0V at pin 6 of the 5534 the circuit did not work.
Only at a setting of slightly more or less 0V, the circuit works.
Make a try and adjust the voltage on the 5534 in the range of + or - 0.5V

i do two DP boards on order and no time on Bara. odnako i will do still one video with reaction of my Bara on metal.

[kt315]

The signal at pin 6 of the 5534 (preamp output) is dynamically changing. You cannot set the null-offset adjustment using a multimeter. An oscilloscope is required to adjust the null so the signal settles at 0V, not so that the average voltage is 0V

first of all he must check all operational amplifiers by special tester. its easely. just set and look on LEDs.

[Qiaozhi]

[ATTACH]44413[/ATTACH] 5534 measure 0.0V to pin 6

The signal at pin 6 of the 5534 (preamp output) is dynamically changing. You cannot set the null-offset adjustment using a multimeter. An oscilloscope is required to adjust the null so the signal settles at 0V, not so that the average voltage is 0V

[Andi68]

I built the version of kt315 and at 0V at pin 6 of the 5534 the circuit did not work.
Only at a setting of slightly more or less 0V, the circuit works.
Make a try and adjust the voltage on the 5534 in the range of + or - 0.5V

[Tibuck19]

Can you post a clear photo of your board with the components on it, It starting to sound like you have perhaps placed the, poly film capacitor's in the wrong spots.

[rdz28]

5534 measure 0.0V to pin 6

[rdz28]

u7 pin1 volt -3.62 and I can not adjust it to -2.1volt

[Andi68]

Have you measured in the right place - IC 7, pin 1?

[rdz28]

I know but I do not understand what .. I did everything as the guide said .. but I still can not adjust u7