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Offline numisNGSTopic starter
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« on: May 17, 2017, 11:15:51 am »
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hello
please I want to know:

A-where we put the scope probe of the RX signal to get 16.12khz reading ?.I maen where we can read the 16.12khz of the Rx signal ?

B-4mv at the open leads of RX coil or at the output of RX op amp IC?

C-when we null the coil . we have to get 20° between RX and TX or just 4mv in the output of RX op amp IC or the open leads of the RX coi?

best regards

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« Reply #1 on: May 17, 2017, 11:23:15 am »
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  Right on the Rx Coil or output of first Op Amp is what I would look at.

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« Reply #2 on: May 17, 2017, 11:26:25 am »
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please replay I add some questions

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« Reply #3 on: May 18, 2017, 10:45:43 am »
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please replay me


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« Reply #4 on: May 18, 2017, 12:39:50 pm »
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hello
please I want to know:

A-where we put the scope probe of the RX signal to get 16.12khz reading ?.I maen where we can read the 16.12khz of the Rx signal ?  Right on the out put of the coil or after the first Op Amp is the place I would look.

B-4mv at the open leads of RX coil or at the output of RX op amp IC?

C-when we null the coil . we have to get 20° between RX and TX or just 4mv in the output of RX op amp IC or the open leads of the RX coi?  Just Null the Coil.  If you built it correct (Off Freq) it will lag the Tx as required.

best regards

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« Reply #5 on: May 21, 2017, 10:25:15 am »
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thank you very much homefire
but I have a question if we get 4mv on the the open leads of RX coil ,it has to be connected ti the pcb with C6 witch is 15nf? .I think the resonat frequency of rx will be 16.12 with coil connected to C6 15nf without it we will get the same resonant transmit frequency.
one more thing I don't think that we get 4mv on both the open leads of RX coil and on the output of the rx op amp I think not sure that the 4mv on the open leads of rx when it goes to Ic op amps It will be amplified and we get something more than 4mv .
what can you say about that ?
see the reading on the scope from the TGSL 101 part
best regards

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« Reply #6 on: May 21, 2017, 12:44:52 pm »
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  The Phase Differential is caused by the Tuning of the Rx circuit.  The coil needs be in circuit to check.   What ever they suggest in the Build Document is just a Bench Mark.  Anything less would be better on the Null.

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« Reply #7 on: May 21, 2017, 05:53:05 pm »
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Quote:Posted by numisNGS
thank you very much homefire
but I have a question if we get 4mv on the the open leads of RX coil ,it has to be connected ti the pcb with C6 witch is 15nf? .I think the resonat frequency of rx will be 16.12 with coil connected to C6 15nf without it we will get the same resonant transmit frequency.
one more thing I don't think that we get 4mv on both the open leads of RX coil and on the output of the rx op amp I think not sure that the 4mv on the open leads of rx when it goes to Ic op amps It will be amplified and we get something more than 4mv .
what can you say about that ?
see the reading on the scope from the TGSL 101 part
best regards
Hi numisNGS
can you post a link to where you got the pics from?
Thank you

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« Last Edit: May 21, 2017, 05:59:07 pm by nickel_n » 		Logged
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« Reply #8 on: May 21, 2017, 06:07:33 pm »
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  Their in the Build Document on Geotech.

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I just bought all but a few parts for a build waiting for more PCB/s to show up at SilverDogs I hope.

LOL, Enough for Two and Restock the Bin.

Item    Sku    Qty    Subtotal
BC547 Transistor NPN 45V 0.1A    A-137    10    $0.40
1N4148 Switching Signal Diode    A-157    50    $0.50
2N2222A 2N2222 NPN Transistor 0.8A 40V TO-18    A-113    4    $1.84
LM358N LM358 358 Low Power Dual Op-Amp IC    A-045    10    $1.60
LM393N LM393 IC LOW POWER DUAL VOLTAGE COMPARATORS    A-023    5    $0.85
LF353P LF353 IC 353 JFET-INPUT DUAL OP-AMP    A-033    5    $1.75
2N2907A 2N2907 PNP Transistor 60V 0.6A TO-18    A-115    2    $0.84
PN2907A PN2907 2907 PNP 60V 0.8A Transistor    A-108    10    $0.50
10K OHM Linear Taper Potentiometer Round Shaft PCB 9mm    A-1847    2    $2.58
100K OHM Linear Taper Potentiometer Round Shaft PCB 9mm    A-1848    2    $2.58
8 pin DIP IC Socket Adaptor Solder Type    A-001    10    $0.30
2.2K OHM 1/4W 1% Metal Film Resistor    A-2341    20    $0.24
3.3K OHM 1/4W 1% Metal Film Resistor    A-2607    20    $0.24
220K OHM 1/4W 1% Metal Film Resistor    A-2329    20    $0.24
10K OHM 1/4W 1% Metal Film Resistor    A-2203    20    $0.24
15K OHM 1/4W 1% Metal Film Resistor    A-2182    20    $0.24
1K OHM 1/4W 1% Metal Film Resistor    A-2200    40    $0.48
100K OHM 1/4W 1% Metal Film Resistor    A-2248    50    $0.60
330K OHM 1/4W 1% Metal Film Resistor    A-2330    20    $0.24
470K OHM 1/4W 1% Metal Film Resistor Royal OHM Top Quality    A-2180    20    $0.24
47K OHM 1/4W 1% Metal Film Resistor    A-2279    20    $0.24
4.7K OHM 1/4W 1% Metal Film Resistor Royal OHM Top Quality    A-2310    40    $0.48
22K OHM 1/4W 1% Metal Film Resistor Royal OHM Top Quality    A-2284    20    $0.24
200K OHM 1/4W 1% Metal Film Resistor    A-2630    20    $0.24
20K OHM 1/4W 1% Metal Film Resistor    A-2339    20    $0.24
27K OHM 1/4W 1% Metal Film Resistor    A-2772    20    $0.24
24K OHM 1/4W 1% Metal Film Resistor    A-2771    40    $0.48
1M OHM 1/4W 1% Metal Film Resistor    A-2277    20    $0.24
0.015uF 50V Multilayer Monolithic Ceramic Capacitor    A-1471    10    $0.40
0.022uF 50V Multilayer Monolithic Ceramic Capacitor    A-1472    10    $0.40
0.22uF 50V Multilayer Monolithic Ceramic Capacitor    A-1367    10    $0.60
15pF 50V Multilayer Monolithic Ceramic Capacitor    A-1393    10    $0.20
0.1uF 50V Multilayer Monolithic Ceramic Capacitor    A-214    30    $1.80
10pF 50V Multilayer Monolithic Ceramic Capacitor    A-1341    10    $0.20
10uF 25V 105C Radial Electrolytic Capacitor 5x11mm    A-4534    10    $0.20
100pF 50V Multilayer Monolithic Ceramic Capacitor    A-1359    10    $0.30
470nF 0.47uF 100V 5% Polyester Film Box Type Capacitor    A-568    10    $2.00
22nF 0.022uF 100V 5% Polyester Film Box Type Capacitor    A-560    10    $1.00
220uF 16V 105C Radial Electrolytic Capacitor 6x11mm    A-4543    10    $0.30
220nF 0.22uF 100V 5% Polyester Film Box Type Capacitor    A-565    10    $1.40
Subtotal    $27.70
Shipping & Handling    $3.51
Use your Store Credits    $0.0000
Grand Total    $31.21



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Offline nickel_n
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« Reply #9 on: May 21, 2017, 06:16:12 pm »
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Quote:Posted by homefire
  Their in the Build Document on Geotech.

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I just bought most parts for a build waiting for more PCB/s to show up at SilverDogs I hope.

Thanks Homie.
i should know better.....

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