bbs 1000

[lamoiz]

Hi everyone.
a friend who owns a sovereing xs A2 pro had his bbs 1000 disc stolen in the trunk of his car. He asks me if I can make a coil .. I do not know what are the data of this coil .. if there is a circuit in it ... ect ... if someone here has this info I am a taker. thank you.

[lamoiz]

nobody has the electro characteristics of this coil?

[Altra]

https://www.geotech1.com/forums/show...233#post151233

See drawing in post 3 - For the opamps you can use AD797, NE5534, OPA1611, LT1028

[lamoiz]

https://www.geotech1.com/forums/show...233#post151233

See drawing in post 3 - For the opamps you can use AD797, NE5534, OPA1611, LT1028

great, thank you for the link to the preamp !! do you have the values for rx and tx?

[Altra]

The TX is 1000uH 1 ohm. Use 22 awg to keep the resistance low. The Rx coil is less critical at about 400uH, you can use light guage wire here like 28 - 30 AWG.

[lamoiz]

The TX is 1000uH 1 ohm. Use 22 awg to keep the resistance low. The Rx coil is less critical at about 400uH, you can use light guage wire here like 28 - 30 AWG.

thank you Altra. with all this I'm going to try to make one, for my friend!

[lamoiz]

https://www.geotech1.com/forums/show...233#post151233

See drawing in post 3 - For the opamps you can use AD797, NE5534, OPA1611, LT1028

hi guys, on the forum there are two sov pream diagrams, one uses a single op amp, and the other, more complicated, uses additional transistors as well as a diode. Is there a difference in the end once installed in the coil? which one is the most efficient?

[Carl-NC]

The transistor version appear to be an earlier design where the transistors are used to achieve lower noise. The AD797 can do this without the transistors.

[kt315]

uses additional transistors as well as a diode
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as well as differential pair of general circuit with NE5534

[lamoiz]

ok thanks guys.

[lamoiz]

hi guys i drew the pcb then engraved. I do everything in crossing elements, I have nothing to do on the surface .. I use low vf 5817 diodes and 15uf tantalum capacitors. I am waiting for my order 797 .. the next question, I wonder what value should the small loop have for the fine tuning of the rx coil?

[Altra]

I believe you have the diodes and caps reversed. Pin 7 on ad747 is v+. For the loop use a length of about 1 turn of the rx coil

[kt315]

sorry, not. not 1. photos sure show there is a hank of the wire. i see 6 on one. so do 4-6 turns.

[lamoiz]

well seen guys !! yes indeed, on the 797 datasheet, pin 7 is v + .. I relied on the diagram given on the forum .. it is therefore wrong on this point. I'll correct that right away. for the wire turns if I use a length of one turn of RX, then on a small loop I would have 5 or 6 turns .. cool thanks guys.
I used this diagram ... I hadn't paid attention ... I copied like a donkey ...

[kt315]

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