Super TGSL With H Bridge TX Diff RX Quad Sampling

[paku]

i have found gud video about TGSL
this is true video or fake
or that is not TGSL in the box
http://www.youtube.com/watch?v=KE2REksFOX8

[Davor]

It is real.

[sa6o]

I do not know much about electronics, this makes a balance coil.

http://www.geotech1.com/forums/attac...8&d=1387727145

[Davor]

This is a presentation of a balanced coil with a centre tap in connection with a balanced preamplifier.

[eduardo1979]

i have found gud video about TGSL
this is true video or fake
or that is not TGSL in the box
http://www.youtube.com/watch?v=KE2REksFOX8

The video is made by me and is true. You can visit my Youtube channel where you will see more videos. Greetings.

[paku]

sir eduardo1979 how you TGSL can be performance the best like that
can you show me your board and part on picture
i have try many style make coil change the component cant get result like you TGSL
how you make! it

[eduardo1979]

The PCB I was using was to Silverdog (TGSL-EDU). The secret lies in the construction of the coils and the capacitor 15nF, which adjusts the resonance frequency in RX. Also the quality of the LM393 (U106), you can increase the gain of the detector.

[paku]

The PCB I was using was to Silverdog (TGSL-EDU). The secret lies in the construction of the coils and the capacitor 15nF, which adjusts the resonance frequency in RX. Also the quality of the LM393 (U106), you can increase the gain of the detector.

So The Important make This Gud Detection For TGSL
1: LM393
2: Caps 15nF
3: Coil

Sorry This My Stupid Question Is
1: LM393. what do you mean quality of U106 LM393
2: Caps. 15nF For RX need change If The Inductance Coil High or not
3: Coil. What is the gud copper size and What Is You TX RX inductance

And Last
Can i use 2N5457 As BF245

[hoadlies]

GREAT interesting Thread

HI GUYS,, I wish you all a Happy-new-year 2014..

I m following his thread with great interest,as I am wanting to build a metal detector ,as hobby , My electronic skills are limited to fine soldering & an can follow schematics ok..

But Lack the actual theory,that especially ''silver-dollar'' and Friends''.here have.

I await further developments in the new year.

I will order a board once silverdog gets back online..

ALL THE BEST WISHES FROM AUSTRALIA ,,,,,,,,,,,,,,,,,,BARRY ..

[Silver Dollar]

Well development on this project is on again! I finally got to add the latest changes.
I had to build up to get them to fit. I had originally made the Transmitter then added
other stuff till the board was full!

Attached are some pictures. One shows a schematic of the mods (in yellow). Others
show the add on board (with upper level mated to the LM393 socket). Another one
shows how we have replaced 1/2 the original SilverDog board with new circuitry.

I still need to add the pinpointer servo and work on the audio. I had a thought to
use a PIC micro controller to do VDI / Audio. I've been busy working on a PI using
a 18F4550 (seen here; http://www.geotech1.com/forums/showt...702#post182702 )

I also reclaimed some laptop batteries. I had 4 old batteries around and very carefully
removed the cells. I bought some single cell chargers for $1 each and will charge them to
find some good ones. They should be about 2000ma and 4 will give 16v or so - maybe some
opportunity to up the power somewhere?

[Thomas]

The red ones (batteries) are the ones looking for a place to die, I have brought back some with .000V+, by charging at 5mA. for 6hrs. and then letting them rest for 1 day then repeat until the batt. voltage gets to 2.5V+, then charge at 10mA to 3V, and when they hold at around 3v I charge normally.

[Silver Dollar]

I have a single charger that runs at 20 ma if below 3V then normal once above that so a few days
on that might bring some of them back. The charger is funky and the positive has the spring on it
so I tried charging them backwards for a few hours! They went down from ~3v to 2.5 but came
back when installed properly.

Some of these are quite old and were left in a poor state but I charged 2 and they are working
in the wife's cordless vacuum so there's hope!

[Davor]

I'm eager to hear about your results.

[Silver Dollar]

I should have it beeping in the next week or so.

I ordered up some coil housings and found a stick to use.
Here's some pictures of the "Stick", it's an old snow brush
my Mom gave me. It quick retracts and locks open with a
twist. It has a tiltable end (just squeeze, move and release).
The only problem is the coil end is metal....

[Thomas]

PVC maybe?