White's 3900 schematic again

[Chris2]

Hi KT315,

can you post the other side of the PCB of the TM 808 (the PCB site with the true hole components) too? Or maybe (if you have) the whole project files?

Regards Chris

[strujas]

This is completly schematic of White 3900,,I have two layer pcb,,I am working on one layer pcb soon it will be done...

[strujas]

Here is the board for 3900 ,,this time I have made one layer board
Dimension of board is :
X=10cm
Y=8.5cm

[strujas]

Dear friends I made this pcb without any eror,,but my friend Ivconic has inform me that this device doesnt work ,,,reason is bad schematic...I please Mr Voran to check schematic and to repair mistakes....

[ivconic]

Truth!


Yup! Truth!
Strujas draw 2 pcb's, one single-sided and one double-sided....I made both respecting schematic......Not working!
I am sure there is terrible mistake in schematic!
Already seen with CoinHawk.....deja vu!
I am not that ignorant to be unable to make workable device. I made over 50-60 various detectors so far....
But it is a sort of tendence or maybe habbit to post faked schematics here on this and other forums....I am very sorry if those schematics have unintentional mistakes (than my doubts are wrong) but as time goes by man can see this situation quite often here????
Why is that so?
If i do not want to share (like i dont, some schematics) than i would not post faked schematics here, just to fool other people...???
It is not fair....
Besides i am not lazy, i can work day and night and check all schematics here so at the end i'll speak LOUD and FREE here and MARK those people...everybody else to know what is all about!
If oposite i'll apologise to those which i called with no reason....


So far only KT315, GEO, QUIAOZHI and CARL posted honest, accurate schematics here......oh yes ESTEBAN too.....Others...shame on you!
I am giving up of wasting my time with nonsences any more....
regards!

[Carl-NC]

I doubt anyone is intentionally posting fake schematics. More likey, there are just honest mistakes... connection errors, wrong values, etc. Easy to do when entering a schematic into a CAD program.

Even I'm guilty of schematic errors... had to make several correction revs in the Hammerhead article, and had a couple of errors in the first rev of the Bandido II circuit.

- Carl

[ivconic]

Well...

Well...yes it is true!
Nobody makes mistakes like me...i am THE ULTIMATE CHAMPION in that matters....
I only feel desperate after day or two putting so much effort and good will in some device and finally it refuses to work!
Last two; Coinhawk and 3900 really busted and exausted me....Coinhawk especially.....i had a lot of hopes in it...
Not to mention Strujas hard labour drawing pcb in spartanic Protel DXP....huh!
anyway...gone with the wind..
regards

[Esteban]

This is the way I found for to be sure if I trace the correct schematic:

1. Copy the circuit.

2. Certains values isn't at sight, as capacitor, so up a pin and see or/and measure.

3. Check with the original.

4. Make measurements of frequency, voltage and etc. in all stages and anotate these.

5. Build the circuit.

6. Adjust at the parameters of the original.

7. Replace.

8. Test.

[Geo]

Hi Esteban. You found this way to do not make mistakes . But other people don't try the same way or they like to give a fake schematic at the forum.
Results......3900 don't work
Voran said that the pcb is critical . I can't understand how critical can be the pcb of a so simple detector??? I understand that if a pcb is critical, mayby detector to don't has the maximun sensitivity or the detector to be unstable, But to don't work ......eeeee i can't understand it .
Bye

[kt315]

imho, right part of the schematic does not seem logical. C14 must be not 15 nF for example. maybe 0,47-1-2,2 mF but not 15 nF. strange that all schematic seems static mode, but here used the capacitor. nonsence.

[voran]

SORRY

[voran]

Perhaps I have mistaken to read the printed circult, but critical design also with interface coil, sorry, demanding!

[porkluvr]

What's the gig

I can't believe this has happened: Somebody finds an old schematic. Apparently, no information on the original coil is known - at least none is given. Does anybody have a clue about the original operating frequency? If so, then they're keeping it secret. What is it, 2kHz? 15kHz? 150kHz??

Somebody has to be very dedicated to entertain the notion of building this circuit - unless there just happens to be a Whites 3900 coil lying around, all lonely and begging for attention. If so, then go for it. Otherwise, don't be surprised when the project doesn't all come together magically.

[Carl-NC]

If this is the White's 3900, then it runs at 6.59kHz, which is White's std operating freq. If so, then there are 1000's upon 1000's of coils that will work.

It would be phenomenally easy to check this out, by building just the TX subcircuit (LM393) and RX input (CA3140) and putting it on a scope. 23 components, including the CD4053. If that part of it works, then proceed.

- Carl

[kt315]

if take a look on Classic and 5900 di pro schematics so if we will take Pin-point (all metal) part from first and add SAT part from second we must get 3900 schematic. it is clear that historically the 3900 is only evolution stage degree to 5900.