C-SCOPE CS660 COIL CONFIG NEEDED

[dave]

Could any one give me a diagram of the configuration of the c scope cs660 coil.

[Phantom]

I am interested so in the coil configuration of CS660 or in one coil construction that works in thisMD

Has anyone this information? I'll be very gratefull

Regards

[Xtrem]

RX 1.8mH 11 Ohm
TX 2X 490uH 2X4 Ohm frequency ~17.5 Khz

[Phantom]

Xtrem thank you very much for your answer.

Are they concentric or DD? Do you know the diameters? Do you know if RX resonance is above or below TX resonance?

I will wind them from scratch and any information is very useful

Thank you very much again

Regards

[kt315]

RX 1.8mH 11 Ohm
TX 2X 490uH 2X4 Ohm frequency ~17.5 Khz

sorry, not. https://www.geotech1.com/forums/show...-660-schematic
there is a link to other thread with coil data (Ap Berg).

[Phantom]

Thank you very much kt315 for the answer.

Yes I had seen both threads with the information provided by ApBerg. Here is some parts of this information:

=============================

The coil is a DD coil.
The TX coil has 3 connections , look at the circuit. There are 2 connections for start and finish and 1 for a connection to ground , this ground connection is made after some 50 turns from the 100 turns total. (The TX coil is in fact 2 coils)
So wind 50 turns then take a loop out ( for the ground connection) then finish the last 50 turns in the same turning direction as the first 50 turns.

=============================

Can you make a coil that works at 17kHz-19kHz,( tune with caps) test this coil on your pcb ? ( for me it works ok)
Start with 50-50 TR windings and 100 receive windings 0.25 mm and searscoil diameter 20 cm.
I think the minidisc is 17-19 kHz !?? Have you checkt the 100kHz on a original working detecor ?

=====================

There is not very concrete information. It looks like both TX and RX coils have 1,9 mH (very close to the provided values by Xtrem in #3) wire diameter could be 0,25 mm, and the search coil 20 cm diameter. The configuration looks like to be DD, and the TX coil has a ground connection in the middle of the winding. Tuning capacitors could be into the search coil. Frequencies near 17 kHz. Both windings could have 100 turns each one

The last are only my supositions.

But on the other other hand in the thread:

https://www.geotech1.com/forums/show...ighlight=cs660

If you see #8 by headshed22 there are photographs of a CS660 coil. It is concentric configuration and it has capacitors for resonance tuning in a PCB, and also two resistors, one of the last is a variable resistor.

Looking to CS660 attached hugo's schematic in #9 of https://www.geotech1.com/forums/show...-660-schematic it looks like the last apacitors of the photographs are CTX and CRX, but I don't know what are the resistors

As we can see there are a some information, but it is confusing

Hopefully someone can put some light on this matter. So I hope the thread could be useful for others

Regards

[Xtrem]

Thank you kt315 for the link.

Im a cscope fan , i like these art of detectors
simply and no motion.

from the measurement I did, on mine cs660
this result appears..



But i think it is so..



because of the very sharp null (~10mV) that can
not be comming out only from the concentration
(concentric coil). RX and TX are at resonance.

Phatom , I'm also interested to make a coil a little
bigger than the original,if I tried it,my orientation
would be similar to a Nautilus DMC coil,I would make
the TX coil bifilar.
I would be glad to learn news from your effort.

Savvas.

[kt315]

because of the very sharp null (~10mV) that can
not be comming out only from the concentration
(concentric coil).
---
sorry, not. not why 'concentric'. we see here 'ideal' transformer - RX is sure same like TX. in ideal transformer its possible to balance in null. in unideal,
with different RX and TX i mean, is not, not possible.

[Xtrem]

Thank you again kt315,
you mean there is not a bucking coil inside ?
this is good , but the dimensions are very critical.

[kt315]

sorry, not. there is backing coil inside. i meant the POSSIBILITY TO BALANCE IN REAL NULL IN SYMMETRIC TRANSFORMER.

[Phantom]

Thank you to both for the information and ideas

From the fact that it uses a TX coil with a center tap ground connection, if both parts of TX winding are one on top of the other with some separaton, a RX coil in the center could be balanced because it receives oposite phase fields from the TX coils. I don't know if it is true or not, or I am wrong. Perhaps both windings can't be separated enough in the enclosure. In any case, any information is welcome.

Savvas I?ll give news of my coil construction. I am with the PCB in this moment and I will test the circuit with a double D 1,9 mH coils. The TX with a central tap

Regards

[georg20]

Cs660 coil pcb.