Tarsos detector vlf turkey

[dfbowers]

Volksturm SM + GEB

thank you dfbowers for your help
i am going to build it....
regards

Mehdi,

A little more information on what I built.
Attached is the parts list that I ordered. It may not be 100% accurate but pretty close.
Also, a good starting point for a coil. Use .25mm wire and the attached pattern. The Rx coil tunes using 85nF cap (about) installed between pin 1 and 2 on JP2 (not shown on schematic).
You don't really need to tune the Tx coil as it seems to work just fine with a squarewave.

Tx - 60 turns
Rx - 90 turns

Coils MUST be made in a very sturdy coil shell with epoxy and RX coil must be shielded
or the project will be a failure!!!

Expected results - 36 cm for 1e.. About the same as TGSL, but all metal mode only. Can be a very worthwhile project!! One nice thing.. Detectors running in all metal mode go deeper in the ground.. but you have to dig everything.

Good luck!
Don

[mehdi]

thank you very much dfbowers for you great helps.
mehdi

[mehdi]

hi dfboewers
in the shematic of volksturm sm ic3 unnamed. but in your ordered part list has ic 4011; may be for u3?
regards
megdi

[dfbowers]

hi dfboewers
in the shematic of volksturm sm ic3 unnamed. but in your ordered part list has ic 4011; may be for u3?
regards
megdi

Sorry for any confusion.

U3 = CD4066 (bilateral switch)
u5 = CD4011 (nand gate)

[mehdi]

Hi dfbowers
some question:
your image of finished vloksturm sm it seem to be sm+geb version but there is some confusion; please see the image below:
in shematic no extra ic hawewar however in your image and geb pcb you use an ic!!!
can you help me please?

[dfbowers]

Hi dfbowers
some question:
your image of finished vloksturm sm it seem to be sm+geb version but there is some confusion; please see the image below:
in shematic no extra ic hawewar however in your image and geb pcb you use an ic!!!
can you help me please?

You will have to follow the schematic posted above in post # 118.

[dfbowers]

You will have to follow the schematic posted above in post # 118.

Oh, sorry.. It's a TL061 TL071 or TL081.

[dfbowers]

Hi dfbowers
some question:
your image of finished vloksturm sm it seem to be sm+geb version but there is some confusion; please see the image below:
in shematic no extra ic hawewar however in your image and geb pcb you use an ic!!!
can you help me please?

Mehdi,

Another thing I wanted to mention that might not be obvious. If you do decide to build the Volksturm, use the schematic as your roadmap to build everything. The PCB does not help much sometimes. The PCB is just a place to mount everything!! When I added the TL061 for GB, I had to bring jumpers to and from the circuit between U1 and U3. Not a big deal but it was added to KT315s original schematic. The GB mod is necessary to make the project more practical for use.

Also, another thing that is a little confusing. There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,

Don

[mehdi]

Another thing I wanted to mention that might not be obvious. If you do decide to build the Volksturm, use the schematic as your roadmap to build everything. The PCB does not help much sometimes. The PCB is just a place to mount everything!! When I added the TL061 for GB, I had to bring jumpers to and from the circuit between U1 and U3. Not a big deal but it was added to KT315s original schematic. The GB mod is necessary to make the project more practical for use.

Also, another thing that is a little confusing. There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,

Don[/QUOTE]
Hi dear Don
thank you very much for help me.

****...There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,)))
where are those capacitor?!
there are two shematic of geb version; your geb addition and kt315 geb addition. please see the below shematic and my pcb: can i use this two addition together on my project ?
regards
mehdi

[porkluvr]

where are those capacitor?!
mehdi

Look for bypass capacitors near the IC power pins (V+, V-). One end connects to ground, the other end connects to -whichever- power trace.

there are two shematic of geb version; your geb addition and kt315 geb addition. please see the below shematic and my pcb: can i use this two addition together on my project ?
mehdi

You do not want to use both. Don's circuit will give you ~150degrees adjustment range. Go with that.

[mehdi]

Hi porkluvr
thanks for help but i am still in confusing please show the capacitors on shematic if it is possible.
thank you
mehdi

[porkluvr]

Hi porkluvr
thanks for help but i am still in confusing please show the capacitors on shematic if it is possible.
thank you
mehdi

I'm sorry if my saying "V+" or "V-" confused you. According to the schematics in this thread I should have written "+" or "-".

Other than that, the purpose of bypass capacitors has been explained. In this system they would go from + to ground, or - to ground. The closer they are located to the various IC supply pins, the better.

If you still have confusion, why don't you show us a diagram or image which indicates exactly where your questions are? Circle the components that you don't understand.

edit: I attached a basic diagram of plain ordinary bypass capacitors. There is nothing special about them. Typically, two sets of parallel capacitors. If one goes bad, you have to isolate them one-by-one or else you won't find the problem.

[dfbowers]

Another thing I wanted to mention that might not be obvious. If you do decide to build the Volksturm, use the schematic as your roadmap to build everything. The PCB does not help much sometimes. The PCB is just a place to mount everything!! When I added the TL061 for GB, I had to bring jumpers to and from the circuit between U1 and U3. Not a big deal but it was added to KT315s original schematic. The GB mod is necessary to make the project more practical for use.

Also, another thing that is a little confusing. There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,

Don

Hi dear Don
thank you very much for help me.

****...There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,)))
where are those capacitor?!
there are two shematic of geb version; your geb addition and kt315 geb addition. please see the below shematic and my pcb: can i use this two addition together on my project ?
regards
mehdi[/quote]

Yes, you can add both GEB mods to your project but you only need one. I could not get the proper range of adjustment with KT315s GEB mod so I added my own.

[dfbowers]

Hi dear Don
thank you very much for help me.

****...There are capacitors on the parts placement diagram that do not show on the schematic. If you have been building for a while you will recognize them as bypass capactors on the OP AMPS. You can use 10n or 100n, I can't remember which ones I used,)))
where are those capacitor?!
there are two shematic of geb version; your geb addition and kt315 geb addition. please see the below shematic and my pcb: can i use this two addition together on my project ?
regards
mehdi

Yes, you can add both GEB mods to your project but you only need one. I could not get the proper range of adjustment with KT315s GEB mod so I added my own.[/quote]

Mehdi,

The bypass caps do not show on the schematic but show on the parts placement. When you begin to populate your PCB you will find pads with nothing to match on the schematic and no values listed. I was a little confused at first when I built m project as well. (I built 3 pcbs!!) In doing a little reading elsewhere I concluded that they were bypass caps (as you will find on many other projects). In researching, I found that 10n - 100n are common values used.

Hope this helps.

Don

[mehdi]

thanks a lot Don and Porcluvr for your help. i understand and i will use your geb mod in my project dear Don.
regards
mehdi