Deal, or train wreck?

[kt315]

Check if the scale is original.
This looks like a modification around the sensitivity of the scale, in the picture.

they just began to use another meter. it's obviously for me, i hope Jim will give pics of it and we will see. the board is REVISION E. same like in TF900.
they did nothing in this board. I am also set REVISION 5 on all my projects, it means/i want to say... A B C D E - '5' - "THE end. nothing more in future. latest revision".
that is.

[Jim in Idaho]

It's interesting, IV, that you brought up the subject of audio sensitivity. I recently bought a data logger. Of course, it records the target signals. But, it is much more sensitive to those signals than either a speaker, or headphones. It can respond to signal strength too weak to move the diaphragm on a speaker, or 'phones, so logs targets a person can't hear, which increases the depth of detection. The meter (scale) on each of my TF models are original, and very responsive, as far as I can determine. I'll post a pic of the meter, but do not want to disassemble the detector again. Taking operational equipment apart is a good way to make it no longer operational....LOL. I just looked, and mine is Revision E. I'll post meter pic, and video later.

Jim

[ivconic]

It is obvious that the front end of the datalogger is more sensitive and therefore "hears" subtle signals that the audio stage does not "hear".
That's a good example of what I wrote earlier.
No, there's no need to open the device anymore, we've seen enough, it's obviously an identical pcb and the only differences are in the inscriptions on the box.
The only thing I was interested in was whether the TF900 could work directly on 12v.
You confirmed that it can.
Although I was interested in the stage for power supply and voltage regulation to see on the pcb, a close-up picture.
Does not matter.

[Jim in Idaho]

https://youtu.be/s-DA96jFjr0

[Jim in Idaho]

I spent an hour trying to upload everything, and ended up with what you see. First pic is meter with power on. 2nd pic is meter with power off. Link is to video of meter in "Battery Check". Batteries are low and that may be why it's acting crazy. Obviously the meter is digital, and not analog, as the needle and small, dark markings are not visible when power is off.
Jim

[Jim in Idaho]

IV, I will open the TF900, and get a pic. I'm not sure where the power supply is, to get a closeup. Let me know where you want the pic, and I'll get one for you.
Jim

[GeoMax]

Do you know when yours was made?

Hi Jim,

I opened the casing and had a look inside. The PCB says 1994 made in the USA.

[Jim in Idaho]

Hi Jim,

I opened the casing and had a look inside. The PCB says 1994 made in the USA.

Interesting, Max. My 1200 has an anniversary sticker on it that's dated 2006.
Jim

[ivconic]

IV, I will open the TF900, and get a pic. I'm not sure where the power supply is, to get a closeup. Let me know where you want the pic, and I'll get one for you.
Jim

The lower right part of the pcb.
Close up around U7 (screenshot).
And check if the zener diode is 5V6 too?




Ah, so it's an LCD scale?!
It's the first time I've seen such a thing!
I have a simple analog scale.
That explains the change of resistors on the pcb, from that other picture.

[GeoMax]

Here an image from that area around U7... maybe it helps. By the way... on the PCB is also stated Discovery Electronics Inc. but sold under C-Scope UK.

[kt315]

The only thing I was interested in was whether the TF900 could work directly on 12v.

why not? they used linear stabilizer so 7V on output is good for 9V on input.
9V+ will work always. 12... 14... etc. but better way to rego on impulse chinese converter STEP UP and supply from one pc 18650 li-ion.

[kt315]

Geo, give pls also your pic of the meter of your CSCOPE.

[Jim in Idaho]

Max, the only difference in the front panels is the Main power switch is labeled a little differently. My third position says "Metal", and the last position says "Trace". My 900 is the same, but the last position says "TR/Trace".
Jim

[GeoMax]

Here an image of the C-Scope meter...

[COLOR=inherit !important]


[/COLOR]

[Jim in Idaho]

The only thing I was interested in was whether the TF900 could work directly on 12v.

why not? they used linear stabilizer so 7V on output is good for 9V on input.
9V+ will work always. 12... 14... etc. but better way to rego on impulse chinese converter STEP UP and supply from one pc 18650 li-ion.

Yeah...could be done, but battery life would suck. Better to use 2 18650 in series, and forget the converter.
Jim