K5000 schematics lost

[Aziz]

Hello,

has someone the K5000 schematics? I think, this is a C-Scope metal detector kit. I built this ten years ago and I have lost the detector and the schematics. Just want to see the LC oscillator part and I think it was a hartley type of osc. with split TX coil windings.

I would appreciate for any hints.

Aziz

[amtech2005]

K5000 schematics lost

NO , I DO NOT HAVE THE SCHEMATIC AND I SEARCHED LIKE CRAZY!! BUT YOU CAN LOOK AT THIS BULGARIAN SCHEMATIC THAT SAYS IT IS A "HIGH POWER TRANSMIT OSCILLATOR"?? ITS VERY INFORMATIVE WITH REGARDS TO THE IDENTIFICATION OF THE STAGES, BUT THERE ARE SOME RESISTANCES MISSING ??. IT LOOKS TO ME LIKE THIS WAS NOT FINISHED. BUT IT MAY HAVE AN OSCILLATOR DESIGN YOU NEED , LOOKS LIKE THE COIL IS CENTER TAPPED. BUT DOES THIS DESIGN HAVE A POTENTIAL FREQUENCY DRIFT OR DOES IT LOOK STABLE??? CHECK IT OUT , OR MAYBE YOU HAVE SEEN THIS ONE ALREADY ????...............BYE........EUGENE

[Aziz]

Hi Eugene,

thanks very much. I haven't seen this schematics before. It is not the K5000 and this type is not the Hartley type oscillator, but it looks very interesting.
Seems to be like a multivibrator osc. Anyway, I can test this oscillator to see the frequency and phase stability.

Regards,
Aziz

[Aziz]

I found a LC osc. patent, which looks similar. Its typically called cross-coupled LC osc.

http://www.google.com/patents?id=s-h...BAJ&dq=7176766

Aziz

[amtech2005]

K5000 schematics lost

YOUR LC OSC. SCHEMATIC IS BETTER THAN THE ONE'S I FOUND !!! THIS THREAD SHOULD BE CALLED "LOOKING FOR HIGH POWER OSCILLATOR CIRCUITS" , BECAUSE FINDING THE OLD K5000 VLF SCHEMATIC MIGHT BE HARD , ESPECIALLY IF ITS FROM C-SCOPE!!!!!!!! I WILL CHECK THE C-SCOPE SCHEMATICS I HAVE . BYE..........EUGENE

[Aziz]

Hi Eugene,

it is more important to have a stable LC oscilllator. More power causes more phase and frequency instability.
With the lock-in amp on my laptop MD, I can see the instability of the LC osc. Best results so far, I got with the internal DDS (Direct Digital Syntesis) of the sound card. I want to compare just some of the LC oscillator types.

Fortunatelly, I found now the Hartley-oscillator of the K5000 on a small PCB-testboard. I have to back-trace the PCB.

Thanks for your effort.

Aziz

[Sean_Goddard]

Aziz, I have K5000 complete schematic and kit(s) I can scan them in as soon as I find them when I unpack to fit out my new office.

In the mean time why not try the oscillator from the Fisher 1266-X2, that was always VERY stable IMHO.

[Aziz]

Aziz, I have K5000 complete schematic and kit(s) I can scan them in as soon as I find them when I unpack to fit out my new office.

In the mean time why not try the oscillator from the Fisher 1266-X2, that was always VERY stable IMHO.

Hi Sean,

thank you very much for this tip! I am looking forward to see the old good K5000 schematics.

Just tried another Colpitts LC oscillator and I had a little breakthrough in laptop MD utilising lock-in amp.

Regards,
Aziz

[Aziz]

Fisher 1266 is using a crystal controlled forced LC osc. So it is not a true LC oscillator but it is forced to oscillate (pulsed). Seeing the schematics, a higher current is sent through the coil. Therefore, it should work sensitiv.

This can also be a good option, to get a very stable detector. I will try this LC osc. on the coming days!

Aziz

[Unregistered]

I have for sale a original 5000 (just put on a dutch auction site) and was looking for a picture. Then I saw your question. Since the detector is not sold, I can send you the wanted schematics. For free ofcourse. Love to help my fellowman.

If you want a copy of the schematic, mail me

[email protected]

[Unregistered]

fellow human being, i meant

[Sean_Goddard]

Aziz, sorry I never did this scanning for you . I just have not the time to do ANYTHING except work and look after my young daughter at the moment.

[Unregistered]

Sean you are repeating yourself to oftenly!
You already promised so many schematics in the past.
You gave NONE so far!? (except non working,mistaken and worthless coinhawk)
Why wasting so many promises.People are hoping and waiting you to fulfill them.
Are you a some kind of joker?
Whenever man ask you to respect your own words and fulfill promises, usually you plead to some objective causes. In the past was some moving from one place to another, now is your daughter (wish her 100 years of happy and healthfull life) ....tomorrow would be something else!?!?!
Sean you should ask your self is it fair?
Regards!

[Sean_Goddard]

I agree, I'm not very good at following up promises and I accept your comments 100%.

I MUST make a better effort.

BUT on the Coinhawk front, as I've said it was NEVER intended as a working project, just the basis for people to use to build a better machine. What I wanted it to be was a build this and see "IF" it works. I wanted people to go from that point to a fully working design. As it turned out there were errors I had not spotted (that was VERY bad of me) I never intentionally posted a "pup" I would never waste the time of my good friends on this forum.

I will TRY, to one day I will build this machine, sort out the problems and post the whole thing as a working project. I won't promise anything, as it appears I'm not good at following them up, so it MAY happen, it may not, but at least I will TRY.

So much other things to do, you wouldn't believe and I only get 1.5 days a week back at home, and then I have accounts, cleaning, any other servicing work on my old car, look after the wife and baby (the wife looks after the baby all week and she works too) work on the house, answer business correspondence, package stuff AND repair metal detectors...Told you..TOO much...

[Aziz]

Hi Sean,

Aziz, sorry I never did this scanning for you . I just have not the time to do ANYTHING except work and look after my young daughter at the moment.

it doesn't matter. I don't need it anymore. Hartley type of oscillators are less stable than colpitts. Anyway, thanks for your effort.

Regards,
Aziz