sd series pinouts

[Anonymous]

Hello there ,could somebody please provide me with the pinout format for the power socket and coil socket on the sd series detectors as i am building a 12v to 7.2v converter for a prospector who lives 330km away!
Also on the drawing board is a "piggyback tx amplifier" for the same series which uses a 12v rail derived from the battery and superimposes a greater signal over the tx pulse from where it derives its input, thereby hopefully increasing depth without affecting operation.Any thoughts or comments on this would be appreciated.
I think that this forum is the best thing since sliced bread!

 

[Anonymous]

Hi Tony, with the greatest respect, the pinouts can be easily worked out using an ohms meter on the coil and a volt meter on the power supply.
Be warned that the 7.2v mod is best suited for the SD2000. If you are planning to put a voltage boosting circuit in series then you may well saturate the ferrite particles in the ground and
end up with just noise. As you would know, Candy tried a few different ideas on the 2000 and I think that he used the back emf off the transmit pulse to derive some of his supply rails, if true then you would have to take this, amongst other things into consideration in the piggy back design. The GP can sense saturation and can compensate with a change in the supply. Anyway, best of luck.
ps, you aren't Tony from Donolly by some slim chance??

 

[Anonymous]

Hello Robert thankyou for the reply.
The main reason for asking for the pinouts was that i do not have a detector available to study at this time and have been asked to do this mod by the mentioned prospector.
Thanks for the feedback concerning the tx amp as it was a thought i had while reading some questions posted on the forum concerning boosting the front end performance of these detectors and also read a post by Eric concerning the same mod.
But in relation to your question about me, no i am not Tony from Dunolly,i hail from Geraldton, Western Australia. Cheers!

 

[Anonymous]

Hi Tony,
The power pinout is as follows:- View from outer panel, power is the top pair of pins (keyway between them and facing up) Left = +ve, Right = -ve. Lower pair of pins is audio.
The coil connector, also viewed the same. Top pair of pins is ground for TX and RX. Right hand middle pin is TX out, which is also strapped to the bottom pin. Left hand middle pin is RX in.
I am looking at a high power TX add on but it appears that you have to feed the 200V flyback spike back into a diode/capacitor on the main pcb. This voltage may be used to generate a supply rail as the unit does not work without it. However, I have not yet found any rails that disappear when the diode is disconnected. Will keep looking. A schematic would be helpful <IMG SRC="/forums/images/smile.gif" BORDER=0 ALT="">
Eric.

 

[Anonymous]

Hello Eric,
Thanks for the info on the pinout now i can finish the project of the converter.
Just one more question though,is the audio ground reference common with the battery negative?,if so maybe i could reclaim one of the 4 pins to run a 12v supply rail to the detector body via the existing cable and connector system for the tx amp!
I dont fully grasp the concept of utilising the energy from the flyback pulse to derive a supply for amp circuitry ,is the energy going to be sufficient considering if my assumption is correct,that you would only feedback a portion of the pulse?
Dont think i know enough about the concepts involved other than the basic theories, although i would be keen to keep you posted about about the development of the amp and observations made.
Regards Tony.

 

[Anonymous]

<BLOCKQUOTE><STRONG>Originally posted by: Tony Wilton</STRONG>
Also on the drawing board is a "piggyback tx amplifier" for the same series which uses a 12v rail derived from the battery and superimposes a greater signal over the tx pulse from where it derives its input, thereby hopefully increasing depth without affecting operation.Any thoughts or comments on this would be appreciated. </BLOCKQUOTE>
This was posted a while back, but on the idea of a "piggy back" power booster for the TX pulses.
Be aware that the SD2000 and 2100 have low power rated front end receive FETs and you will blow 'em up.
...as we don't seem to have many follow ups in to this post, I wonder whatever happened to Tony Wilton ?
If he needs some front end RX FETs, he better email me.lol <IMG SRC="/forums/images/biggrin.gif" BORDER=0 ALT="">