Full m/lab SD2000 schematics

[Ozoz_xba]

Not for those who want to argue. For those who want to do it. Enjoy

What should be those polarized capasitor voltage 1000uf 200v or 1000uf 16v i relly didnt get the pont on those polarite capacitors.also for 1uf and 4uf the voltage?

[Anis]

Hi Mechanic,

Sorry for the too late replay, I was waiting for new wires and new part which i recieved recently,

Please see below are the new SD2000 Transmit And Sample Timings:

[Anis]

SD2000 Transmit And Sample Timings follow:




N50 compared to N12 and N14:




I ve build new coil with litz wires, inductance=340 uH
till this moment I can't reach the 180v in the 100uF/200V capacitor, could you and all genius people here help me with this?



Thx
J.Anis

[Anis]

Hi waltr, could you please take a look on these screens schott and advice ?, I m stuck in this result.

Rgds
Anis

[Orbit]

SD2000 Transmit And Sample Timings follow:

[ATTACH]49705[/ATTACH]
[ATTACH]49706[/ATTACH]

N50 compared to N12 and N14:
[ATTACH]49707[/ATTACH]
[ATTACH]49708[/ATTACH]
[ATTACH]49709[/ATTACH]

I ve build new coil with litz wires, inductance=340 uH
till this moment I can't reach the 180v in the 100uF/200V capacitor, could you and all genius people here help me with this?


Thx
J.Anis

The coil it must have both inductance and resistance and capacity like the original i tested the coil of goldscan5 which has similar inductance but greater resistance and on sd 2000 i get about 120v of the required 180v!

[waltr]

I posted this morning but my post seems to have disappeared.

The N12 signal on the scope looks wrong.
Why does it have three Voltage levels??
This is driven from a 4013 running at 5V. Should be either 0V or 5V.

Where is the 10uF/200V cap? I could not find it on the schematics.

[Mechanic]

What is the resistance of this new coil?
What is the self resonant frequency?
What voltage are you getting on the 200v cap?

Coil resistance should be about 0.4r and the self resonant frequency between 250 and 750khz.

Waltr, the 100uf 200v cap is on the transmit page.

Cheers Mick

[Anis]

Back late again, and sorry for that!

Mechanic, I have to build an adjustable oscilator to see the SRF for my coils, anyway, below are my answers to your questions:

*

What is the resistance of this new coil?
Coil1 (build with 160/44 litz wires)=1,24 ohm
Coil2 (build with 1,2 Dia single wire)=0,7 ohm

What is the self resonant frequency?
Coil1 SRF= about 400 KHZ
Coil2 SRF= about 20 KHZ

What voltage are you getting on the 200v cap?

Coil1 Voltage= 8V
Coil2 voltage=13V

Note 1:
Both of the 68ohm resistrors become too much hot even they change color.

After dowing meany measures and tests...I was electroted when accedantly tached the 200V capacitor! (I have to take security in concediration)
-->In fact the circuit is fuctionnal.

So ,and this is the important thing, I started to measure volts references: (coil2 used for these tests)
-Battery voltage= 3,8V (condition confirmed by replacing battery with adjusted power supply)

- (+5V)= +2,27V

- (-5V)= -3,70V

- 200V capacitor voltage= 181V


In addition I v screaned the voltages through coil, pin 2 of the 393 IC and the curent wave as per Zed recomandation as below attachements:

Coil voltage:


Pin 2 of 393 IC:


Curent wave:


with this condition and the +/- 5 voltages there is no sound from speakers, and ones I increae battery voltage to 6V:
-sound comes again
-the 2x 68 ohm resistors become too hot
-200V capacitor volts reduced to 13V
-signals from coil and 393 are decreased

with this results things becomes more intersting and confusing too, hope that you can help and drive me to the good way

Thx
Anis

[WM6]

*

What is the resistance of this new coil?

Coil2 (build with 1,2 Dia single wire)=0,7 ohm

What is the self resonant frequency?

Coil2 SRF= about 20 KHZ

Are you sure?

[Anis]

Are you sure?
[/LEFT]

Yep, I will put screens for the SRF and detail the measuring method by tomorrow.

[Mechanic]

Back late again, and sorry for that!

Mechanic, I have to build an adjustable oscilator to see the SRF for my coils, anyway, below are my answers to your questions:

*

What is the resistance of this new coil?
Coil1 (build with 160/44 litz wires)=1,24 ohm
Coil2 (build with 1,2 Dia single wire)=0,7 ohm

What is the self resonant frequency?
Coil1 SRF= about 400 KHZ
Coil2 SRF= about 20 KHZ

What voltage are you getting on the 200v cap?

Coil1 Voltage= 8V
Coil2 voltage=13V

Note 1:
Both of the 68ohm resistrors become too much hot even they change color.

After dowing meany measures and tests...I was electroted when accedantly tached the 200V capacitor! (I have to take security in concediration)
-->In fact the circuit is fuctionnal.

So ,and this is the important thing, I started to measure volts references: (coil2 used for these tests)
-Battery voltage= 3,8V (condition confirmed by replacing battery with adjusted power supply)
[ATTACH]49825[/ATTACH]
- (+5V)= +2,27V
[ATTACH]49826[/ATTACH]
- (-5V)= -3,70V
[ATTACH]49827[/ATTACH]
- 200V capacitor voltage= 181V
[ATTACH]49828[/ATTACH]

In addition I v screaned the voltages through coil, pin 2 of the 393 IC and the curent wave as per Zed recomandation as below attachements:

Coil voltage:
[ATTACH]49829[/ATTACH]

Pin 2 of 393 IC:
[ATTACH]49830[/ATTACH]

Curent wave:
[ATTACH]49831[/ATTACH]

with this condition and the +/- 5 voltages there is no sound from speakers, and ones I increae battery voltage to 6V:
-sound comes again
-the 2x 68 ohm resistors become too hot
-200V capacitor volts reduced to 13V
-signals from coil and 393 are decreased

with this results things becomes more intersting and confusing too, hope that you can help and drive me to the good way

Thx
Anis

Hi Anis,

You need at least 6v to run properly otherwise the 181v won't be high enough and there are protection circuits that stop the receive fets coming on. That is why you don't hear anything before raising the voltage to 6v.

The IRF710 will need to be mounted to some sort of heatsink as it will get hot. Make sure it is insulated as the tab has 180v on it. It is normally mounted to the case on the sd2000. If your 68r resistors are getting hot then the irf710(or tlc217) isn't working correctly or the resistors current rating are too low.
The tlc271 can easily be damaged, you might need to replace it.
Also make sure your connections are correct to it, that GRND is correct and you have the link to the 2.5v reference from the power supply circuit.

For the coil srf, to measure it I just place the coil(just connected to the scope) near(just close enough to observe decent ringing amplitude) another coil connected to a detector and look at the frequency of the ringing after tx off.
A single strand coil is no good for the sd2000. It takes too long to settle to 0v

Cheers Mick

[Anis]

Yep, I will put screens for the SRF and detail the measuring method by tomorrow.

Hi WM6, below are test circuit and screen of coil SRF



Thx
Anis

[Anis]

Hi Anis,

You need at least 6v to run properly otherwise the 181v won't be high enough and there are protection circuits that stop the receive fets coming on. That is why you don't hear anything before raising the voltage to 6v.

The IRF710 will need to be mounted to some sort of heatsink as it will get hot. Make sure it is insulated as the tab has 180v on it. It is normally mounted to the case on the sd2000. If your 68r resistors are getting hot then the irf710(or tlc217) isn't working correctly or the resistors current rating are too low.
The tlc271 can easily be damaged, you might need to replace it.
Also make sure your connections are correct to it, that GRND is correct and you have the link to the 2.5v reference from the power supply circuit.

For the coil srf, to measure it I just place the coil(just connected to the scope) near(just close enough to observe decent ringing amplitude) another coil connected to a detector and look at the frequency of the ringing after tx off.
A single strand coil is no good for the sd2000. It takes too long to settle to 0v

Cheers Mick

Hi Mick,
I m thankful for your support and advices, I will go through it and will be back soon.

Thx
Anis

[WM6]

Hi WM6, below are test circuit and screen of coil SRF
[ATTACH]49849[/ATTACH]
[ATTACH]49850[/ATTACH]

Thx
Anis

OK, if 0.220uF C is as per schematic?

I was thinking in classical PI configuration coil SRF.

[Orbit]

Hello Mich!

What could be the cause poor detection on small things that is, poor detection of small targets and the larger one detects ?