IDX-PRO+VDI

[ricalbertvig]

if you used coat .. I manage to not even remove the background noise interfencia and voltage pin 6 achievement as much as 1.2 volts lower it ..

[ossamaussama]

everywhere interference and annoying background noise ... lowest voltage I can download it a1, 2 volts on pin 6 U1 ... looking componetes ... I still can not get uid remove that line ... even an intermittent sound outside the house .. I fail to know that you may be going ... ask for help .. regards

ok,voltage at u1 piin 6 shoulld be (0.1-----0..2max)
diid you use shield?

DD coil is more stable than cc coil

check cable connector it will make instability if it not good type


check ground balance potentiometer or replace it

[ricalbertvig]

everywhere interference and annoying background noise ... lowest voltage I can download it a1, 2 volts on pin 6 U1 ... looking componetes ... I still can not get uid remove that line ... even an intermittent sound outside the house .. I fail to know that you may be going ... ask for help .. regards

[ossamaussama]

may be your coil not well balanced what is the voltage at ne5534 pin 6 when no metal near the coil ?

does you use sheild ?
in room IDX is noisy little but outside home it is so good and stable

[ricalbertvig]

Greetings, I have a problem setting the detector are .... have a range of 30 cm to a coin ... but with much background noise interference is annoying ... I could not remove this noise will ... I'm not using the BC327 ... I'm using the other TNT159 not know if this affects? ... I already have that sound crazy interference ... ask for help .. sorry my translator does not use English

[golfnut]

You have a few unknowns, and little way of viewing without scope.

To help the foto we need better. closer images we can read the resistor colours etc. plus a bit more resolution - file size.

The good start is "I get 8" on silver ring" so the disc and geb CH's appear to both work.

Can you reject ferrite
can you reject iron
can you accept ally, bronze, gold silver

For more sens you need to adjust the Rx cap either up or down by 1nF at a time and retest.


The initial phase you cant test.

The stability may improve by twisting the pot wires.

What volts do you have on the op amp rails --- put meter black on one of pcb corner holes

you could reduce Tx cap by a few nF to boost it up

make sure the resistor on the Tx transistor is 39 R

[paku]

hahaha dont try bro
just fix you board

what coil you ar using

TX mH
RX mH

with out coil
when you first on your board have you get first beep

[Valters]

I think, that i will try Paku method, except part with microwawe!
Her is a fotos:

http://content31-foto.inbox.lv/albums/p/puisitis5/CoilConnect/017c472605539e18517b281edc29d5aa833b9d44af-00001.sized.jpg?1389023103

http://content31-foto.inbox.lv/albums/p/puisitis5/CoilConnect/01c6eb0f3b7825ac54281cc94edde59872f81c4250.sized.jpg?1389023156

[paku]

Hi everyone!

I build PCB (from Silverdog) and 27 DD coil from georgi(not filled with epox yet). I get 6,15kHz on TX.
Sensitive on silver ring ~20cm (~8 inches), but detector is really unstable ( somebody move in room where is detector, it starts beeping). If i turn on PP, detector become stable, but max deep on the same ring is ~4-5cm (less then 2 inches).
Maybe someone has i idea what problem i have?
P.s. I dont have oscilioscope.

Try put that board in micro wave
then set time to 10min then take it out
now test that if not working buy the new one again from silverdog

[golfnut]

Do you have camera?

[Valters]

Hi everyone!

I build PCB (from Silverdog) and 27 DD coil from georgi(not filled with epox yet). I get 6,15kHz on TX.
Sensitive on silver ring ~20cm (~8 inches), but detector is really unstable ( somebody move in room where is detector, it starts beeping). If i turn on PP, detector become stable, but max deep on the same ring is ~4-5cm (less then 2 inches).
Maybe someone has i idea what problem i have?
P.s. I dont have oscilioscope.

[mohandes]

I looked at the current release of PCB from Silverdog and also the pcb that had the oversize pads and a short circuit. This schematic goes with both. [ATTACH]27501[/ATTACH] There was an earlier release pcb which was a little different. All of them work. S

again thanks man
you are really perfect and i want for you best wishes

[golfnut]

I looked at the current release of PCB from Silverdog and also the pcb that had the oversize pads and a short circuit. This schematic goes with both. There was an earlier release pcb which was a little different. All of them work. S

[wlewis]

You should have only smoked the protection diode, replace that or temporarily cut it out and retry its probably ok. Worth a try..

S

Exactly.. and it did smoke.. that's how I knew the batt terminals were reversed btw. The bright side - at least the caps didn't explode jaja .

Things are looking up, its working again though a bit off - its popping right after the tone on each pass like I'm over driving it somehow.

[mohandes]

Hey has anyone redawn the IDX in ExpressSCH format? I've staid away from this project
because the schematic is too hard for me to read...

my friend just download this pcb ( be careful have 2 or 3 mode ) and next do any thing that mr golfnut do .(download that too )
if you can make dd coil next continue .
regards