Max voltage on sd2200v2?

Hello, i'm new here! I Bought a sd2200v2 and i want to upgrade with lipo battery.. i read in some forum and i want to know what's the best voltage for reach the best depth and stability.. i read something about 8.3v... is this ok? I'm afraid to break something..

Thank you!

Hi BetaGod, I can tell you a SD2200d will handle just short of 8.0v and 7.3 is the optimum for it, as far as the V2 is concerned, I'm not too sure but being the blue box, I would bet it's regulated inside and maybe only be able to handle 6.7v, but let's see what others have to offer.

Ok thank you! so i'm going to use 7.3v I hope i'll get better treshold stability and a bit of depth (i'm a relic hunter!)

Hi Betagold
Its almost certain to be regulated so you should be fine,you can also call minelab or contact link technologies I'm sure woody will help.

Sorry i don't understand i don't talk english very well ).. you want to say that there is an internal voltage regulator? I'm making an external voltage regulator

Betagold, the SD2200d is a different box to the SD2200v2, the "d" was the first version and is a green box, the "v2" is a blue box and was the 2nd version. The green box wasn't overly regulated so you could run a higher voltage and hence more current to the coil, increasing it's depth, but this also increased noise from the machine. 6.7v was it's correct voltage but it could handle 7.95v but it would be quite noisy so "they" found that 7.3v was it's best balance between depth and noise. The blue box is an early GP design and GP machines had internal regulators so that people couldn't increase the voltage too much and possible "cook" the internal components - they were regulated to 6.7v so it didn't matter how much voltage you tried to pump in (to increase depth), the max the regulator would let through was 6.7v. If you are making a power supply for your "v2", it wouldn't hurt setting it to 7.3v but know that anything above 6.7v is probably going to get wasted. Also be sure that your power supply can deliver 1A and if possible up to 1.5A of current to cover the possibility of using larger coils, and you should have all your bases covered to be able to use the "v2" to it's maximum potential.

i'm going to use a 11.1v (regulated) lipo with 6000mAh.. i think is ok

11.1v, that's quite high and that would mean the internal regulator in the v2 will have to do a lot of trimming and as such get quite hot and maybe cook itself - I don't think that I would be using anything quite as high as this myself. Why would you want such a high voltage input when the detector requires 6.7v to 7.3v? The 6000mAh should give you about 5 hours of use I would imagine before they'll need re-charging. Personally, if you're adamant in building your own power source, then I would be looking for something a little less in output, maybe a camcorder battery which can be bought quite cheaply on fleebay that have between 7.3v and 8.4v, and if you can afford to splurge out, the Coiltek Pocket Rocket was a fantastic power source that used camcorder batteries that are readily available on fleebay for about $25-$30 each. After all, the last thing you would want to do is cause some internal damage to the detector - who would have the expertise to repair it in Italy?

Hello, i got an external voltage regulator which regulates the voltage at 7,3v so there is no problem! I prefer 11.1 because 7.8 lipo when is flat supplis something like 6-6.5v and i want to supplis 7.3 constansly! the 11.1 when is flat supplis something like 9-10v!

Hi Guys,

The 2200v2 is still basically the same as the 2200 original. It has no regulation for the coil operating voltage(battery voltage) so whatever you put in goes to the coil. If you apply too much voltage, the detector will either shut down or won't turn on(safety mechanism) and if too too much (don't know how much this is and don't want to find out!) is applied the magic smoke will escape!
The detector will run fine between 6~7.8v.
Regulating using switchmode power supplies will cause noise and make the detector unstable.
Best to use a higher output battery(eg 12v) and regulate down using an ldo regulator of some sort.

Cheers Mick

It is exactly what I will do! ;D

Hello Mechanic, this is ok for you?

- input voltage     from 4V to 40V;
- output voltage   fopm 1,3V to 37V;
- Max 3Ah
-Module: DC-DC LM2596

Hi Betagod,

No, this is an SMPS and the output voltage is very noisy and will cause the detector to be unstable.

Look up lm317 on ebay, there are many modules available, make sure it's output can handle >900mA. You will need a decent heat sink on it.

Cheers Mick

http://www.ebay.it/itm/DC-DC-Convertitore-lineare-LM317-Step-Down-Buck-modulo-Low-Ripple-alimentazione-/191106637075?pt=LH_DefaultDomain_101&hash=item2c7ed7dd13 this is ok?

I tried to mount the voltage regulator that I had already bought (Module: DC-DC LM2596).. I tried it at 7v and the threshold seems more stable then the i used the Pb battery..

you told me it would become less stable.. why is more stable at this moment?

I have already ordered the LM317 but i don't know if i really need it!

HI Betagod,

In my experience I have found that smps power supplies make the detectors more noisy. It isn't always constant noise(like emi) but will come in waves, so it might be perfect for a bit then after a bit of time will go noisy for a little bit then quiet again.
Are you testing somewhere that you can get a quiet, smooth threshold? It is very hard to recognise the noise when you are testing at home where the detector doesn't run stable because of electrical interference. However, if it works for you, then go for it

And yes that is one of the lm317 boards I looked at, it should be fine, just make sure the heatsink doesn't get too hot.

Cheers Mick

Yes i tried it out of the city without EMI or something else! Anyway i tested it for a short time.. i think i can test better soon! And on Thursday i'll try the LM317 too.. i think i'll remove the heatsink and i connect it with an alluminium plate who can dissipate more!

Little answer.. my friend got a sd2200d.. i can do the same for him?

Yes it will be a good idea to use a better heat sink. You could mount it in a di-cast aluminium box

Yes this will work for the 2200D also...

Cheers Mick

thank you!!

Today i tried with the LM2596 for 2 hours.. 100% stable without any noise.. i'm happy for this! I tried also the lm317 and is stable too but heats a lot!

HI Betagod,

Interesting!

It could be due to the different front end pre-amp arrangement in the 2200, in that it uses an AD797, whereas the other detectors I have tried this on used the matched transistor pair, LM394 which are perhaps more susceptible to noise from the voltage supply.

If it works as you say, then I'd be using the lm2596 as it will be much more efficient than the lm317.

Cheers Mick

i'll try again if it will be stable i think is the best for no heat generation!