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Offline xavierTopic starter
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« Reply #40 on: August 11, 2011, 01:33:53 am »
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GD that is great info I'm sure this will help many detector builders as for me I'm off to find a 10M pot

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Offline japanese
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« Reply #41 on: August 11, 2011, 09:02:59 am »
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Hi xavier

Can simply use the POT rang 2k with a large W ,And used for a short period, a period setting and then remove it outside  the measured resistance, which gives the best results

best time

j.

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Offline xavierTopic starter
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« Reply #42 on: August 11, 2011, 09:35:34 am »
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Ok thanks for that Japanese

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« Reply #43 on: August 11, 2011, 05:44:49 pm »
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hi XAVIER instead of going threw all this i tell what i used for  the matshless and the clarck VLF detectors:
i used the screened cables from a used computer screen cable,it came with 3 screened cables, and i used the 15 D connector also from an old computer used as the serial comm. almost negligable resistance.   

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Offline xavierTopic starter
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« Reply #44 on: August 12, 2011, 07:09:02 am »
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This is a PI detector not a VLF (No comparison) but I will keep that in mind

All the best
Xavier

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Offline o.mag
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« Reply #45 on: August 12, 2011, 02:58:33 pm »
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hi Xavier
to select resistance in parallel with the coil must be viewed pin 6 of the LF357. resistance to the largest possible or there're no oscillation (signal just cost)

olivier


pour choisir la résistance en parallèle avec la bobine, il faut visualisé broche 6 du LF357 .  prendre la résistance la plus grande possible ou il n'y as pas d’oscillation (signal juste amorti)

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« Reply #46 on: August 12, 2011, 06:53:09 pm »
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hi Xavier i know that but we are talking about the cable resistance and the connector these cables am telling you are high quality and you can have them as from scrap computer screens.

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« Reply #47 on: August 13, 2011, 08:11:14 am »
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Hi kabierkabier

As far as know the wire in the monitor cable is twisted (this will not do) but I could be wrong.

o.mag

Thanks for the info I will have a look into it but I only have a PC scope (makes things harder).

All the best
Xavier

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« Reply #48 on: August 13, 2011, 05:28:35 pm »
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hi Xavier the cable for color screens from the PC to the screen it have 3 small co-axial high quality cables and so many single wires nice for connecting the speaker and other jumpers.just cut the tow ends of the cable.it measures 5 feet or 10 feet.
good time

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« Reply #49 on: August 14, 2011, 03:23:43 am »
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Hi kabierkabier

I will have a look at that cable as soon as I get to Johannes Burg on Wednesday.

All the best
Xavier

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