I need help with idx pro silverdog red pcb!!

[Tibuck19]

Glad it works for you. I know it sound as advertising but follow KT315 advice. Whether you use his device or another, find a way to check the opamps are performing as per the specs. Or if you have another project with the same component, swap. I'm preparing for IDX and looking for step by step guide, so may need your help soon too;-).

I have yet to find a step by step for the IDX , ill be happy to help anyway I can, limited as my help is lol. This week I get the VID working on it! One thing, be mindful of the speaker , If you can, use a 32ohm speaker, I had to replace the MPSA13 and its paired npn transistor, they both got hot and one or both blow, im pretty sure it was the speaker that caused this.

[Tibuck19]

faulty not faulty my simplest tester gives clear picture. http://www.geotech1.com/forums/showt...parator-tester

you are opulently right KT! I should of gotten on of these board from you when I bought the coil tester, it would of been handy today for sure!

[nonkapo]

you were not far off, Chips were not fake but one was faulty, change them all and put originals back in one by one till I found the bad one. Everything is back to working as it should, Full disc, Full depth or 34Cm on a penny. Thanks for the help.

Glad it works for you. I know it sound as advertising but follow KT315 advice. Whether you use his device or another, find a way to check the opamps are performing as per the specs. Or if you have another project with the same component, swap. I'm preparing for IDX and looking for step by step guide, so may need your help soon too;-).

[kt315]

you were not far off, Chips were not fake but one was faulty, change them all and put originals back in one by one till I found the bad one. Everything is back to working as it should, Full disc, Full depth or 34Cm on a penny. Thanks for the help.

faulty not faulty my simplest tester gives clear picture. http://www.geotech1.com/forums/showt...parator-tester

[Tibuck19]

Any fake chips i guess??? These days i'm scared when using anything with Texas instruments logo on it?!?!? Is the source of parts reliable?

you were not far off, Chips were not fake but one was faulty, change them all and put originals back in one by one till I found the bad one. Everything is back to working as it should, Full disc, Full depth or 34Cm on a penny. Thanks for the help.

[Tibuck19]

A little progress was made, I swapped all the 393's and the 358's and i'm now able to discriminate , but the GB is still at the very end of the POT, same if I use a 20K or a 50k .

[Tibuck19]

what i must do? remake new board?

OHHH ok I get it! you meant the board layout is not the best it could be, although I am sure you are right, others have made this and they seem to work correctly ???

[kt315]

what i must do? remake new board?

[Tibuck19]

i always ask people DO NOT use sprint layout. this simplest soft does NOT have internal means to check/compare
your schematic with a layout. just high level CAD soft have that engine and you can easely to check the conformity
between your schematic and board layout.

Im not sure what you are suggesting I to do to solve this.

[kt315]

i always ask people DO NOT use sprint layout. this simplest soft does NOT have internal means to check/compare
your schematic with a layout. just high level CAD soft have that engine and you can easely to check the conformity
between your schematic and board layout.

[Tibuck19]

Good evening, first you should also send the back of the pcb, and not to be wrong for my experience, you have to measure each component (potentiometers - resistors - capacitors), and very carefully watch with a lens the welds that there is a short circuit , I say this because with the same circuit I had a similar problem because of a potentiometer and a capacitor with false capacity. It made me crazy.

Here is the back side, I will re look with a magnifying glass. If you are wondering why one resistor is put on the back side, its because I wanted the lead to be used for the Y if I was going to put a VID on it at one point.

[dgm]

Good evening, first you should also send the back of the pcb, and not to be wrong for my experience, you have to measure each component (potentiometers - resistors - capacitors), and very carefully watch with a lens the welds that there is a short circuit , I say this because with the same circuit I had a similar problem because of a potentiometer and a capacitor with false capacity. It made me crazy.

[Tibuck19]

Any fake chips i guess??? These days i'm scared when using anything with Texas instruments logo on it?!?!? Is the source of parts reliable?

I doubt that very much the IC's that are on it now, Andy AKA silverdog sent them too me, I also have spares that I got from Digikey, there is something else wrong, Perhaps the 3.3? its not a Polyfilm but was sent by Andy so I figure it is good for it as with the 650p that next to the 553 ?its also not a polyfillm box. I doubt that's the problem though.

[nonkapo]

Any fake chips i guess??? These days i'm scared when using anything with Texas instruments logo on it?!?!? Is the source of parts reliable?

[Tibuck19]

My board, Perhaps I Messed something up ?