Vincent R. Posted December 13, 2014 Report Share Posted December 13, 2014 Putting together a DIY battery eliminator for a G2 TX I use in the bag for IFB. Core of it is a Swadj3 regulator, it can bring down up to 35v to the required 3v. The G2 uses les than a watt, and this device can give you up to 25 watt max, so you can use one of these things to power multiple sennheiser RX/TX, thus ruling out buying a couple of official Sennheiser eliminators ($69). The thingy goes for about $25. It's small enough to fit in the battery compartment of the G3/G2 by the way. Quote Link to comment Share on other sites More sharing options...
osa Posted December 15, 2014 Report Share Posted December 15, 2014 Love it - bought a similar one of these to power another 3v device - possibly a zoom for transcription? But never got around to it and later never use the zoom like i used to. Now you got me thinking outside of the zoom box what else i can use that little gadget on... -Ken Quote Link to comment Share on other sites More sharing options...
Derek H Posted December 15, 2014 Report Share Posted December 15, 2014 Please let us know how it goes. I used one of those same switching regulators on a mixer rig years ago to power a zoom h2 and it introduced a lot of noise into the audio on the zoom (not exactly a shocker given it was a $200 recorder). I'm most interested in the physical construction you end up with. Good luck! Quote Link to comment Share on other sites More sharing options...
RadoStefanov Posted December 15, 2014 Report Share Posted December 15, 2014 I have 2 battery eliminators for g3 I want to sale. Quote Link to comment Share on other sites More sharing options...
vale Posted December 15, 2014 Report Share Posted December 15, 2014 Rado I've sent you a pm. Vale. Quote Link to comment Share on other sites More sharing options...
vidman Posted December 15, 2014 Report Share Posted December 15, 2014 Hello everyone, I'm an production sound mixer from Lithuania. Maybe you will be interested, my DIY battery eliminator. Wireless - Sennheiser 2000, DIY plastic box-holder for receivers, two units NP1 battery, one - wireless, second - mixer. The sound bag - Petrol Pegz-2 (sorry my poor english) Vidas Quote Link to comment Share on other sites More sharing options...
Vincent R. Posted December 15, 2014 Author Report Share Posted December 15, 2014 Hey Vidas, looks good! Like the battery blocks! How did you make them? About the regulators: why you used 4? Are they low wattage rated? Basically I want to do about the same: I have to power a mixer (12v), Micron Tx (7.2v) and a G2 for iFB (3v). I will use Sony np-f batteries (7.2v), about 50 watt they are so swap at lunch and you are good. so I have to regulate the output for the mixer and IFB. Keep you guys posted. Quote Link to comment Share on other sites More sharing options...
Rick Reineke Posted December 15, 2014 Report Share Posted December 15, 2014 Nice work Vidman! I personally don't see any need for G2/3 external power since 2.4 Ah (rechargeable) AAs run them for 12+ hours. However I only have four (100 series) and mostly use them for seconds and spares. Quote Link to comment Share on other sites More sharing options...
SeeKai Posted December 15, 2014 Report Share Posted December 15, 2014 Hello everyone, I'm an production sound mixer from Lithuania. Maybe you will be interested, my DIY battery eliminator. Wireless - Sennheiser 2000, DIY plastic box-holder for receivers, two units NP1 battery, one - wireless, second - mixer. The sound bag - Petrol Pegz-2 (sorry my poor english) Vidas That's some damn fine looking work! A tip of the hat to you sir. Quote Link to comment Share on other sites More sharing options...
berniebeaudry Posted December 15, 2014 Report Share Posted December 15, 2014 Beautiful work Vidman! Quote Link to comment Share on other sites More sharing options...
vidman Posted December 15, 2014 Report Share Posted December 15, 2014 Thank you all for your kind attention Vidas Quote Link to comment Share on other sites More sharing options...
Rasmus Wedin Posted December 21, 2014 Report Share Posted December 21, 2014 Damn nice work man, my hat off to you! Quote Link to comment Share on other sites More sharing options...
indrasetno vyatrantra Posted January 1, 2015 Report Share Posted January 1, 2015 Nice idea sir vidman.... Quote Link to comment Share on other sites More sharing options...
Dave Williams Posted May 17, 2015 Report Share Posted May 17, 2015 This seems like the best place to post this little bit of show and tell! Recently finished making my first G3 battery eliminator for in-bag use. It uses three Traco TMR 1210 DC converters (isolated), and locking toggle switches, and locking DC plug/jacks; all protected by a 2.5A poly fuse. The belt clip comes from an old tape measure I had lying around. It was quite a tight fit and fiddly to get it all in the enclosure, but I'm quite happy with the results Quote Link to comment Share on other sites More sharing options...
fieldmixer Posted May 21, 2015 Report Share Posted May 21, 2015 Very nice Quote Link to comment Share on other sites More sharing options...
Cedric Akins Posted August 12, 2016 Report Share Posted August 12, 2016 I really like the work on these battery eliminators. How did you construct the fake batteries that fit inside of the G3s? I understand the voltage regulators and wiring for the most part, but the issue of fitting the fake battery on the inside of the units are my biggest concerns. Quote Link to comment Share on other sites More sharing options...
sisal Posted August 13, 2016 Report Share Posted August 13, 2016 I made some battery eliminators myself as well, I got empty AA placeholders from here:https://www.fasttech.com/products/0/10001920/1171900 They are made like real battery shells, i.e. the tip is isolated from the shaft, but they have a spot welded lug connecting the shaft with the tip - they can very easily be opened with a rotary tool, just rip out the lug and connect your own wires. I was surprised how easy soldering was, i expected it to be aluminium that needs a little agressive flux and some effort, but standard electronic soldering tin stuck right away. I rubbed it in anyways just to be sure You only need to work one, the second one can go in unmodified. For the first one I made, I cut open and soldered two placeholders together, and put a DC buck converter and a linear voltage regulator in it. As I tested the second one without voltage regulator, it turned out that for what I do the twenty-something dB RF attenuation the voltage regulator adds is not as important as battery efficiency. So the approach of having 4 of what I guess vidman used: https://www.fasttech.com/products/0/10002934/1219200 is not as bad as it seems. They are cheap, but if you put more than 1A on them they get pretty hot. So if you have more than 500mA load, just add some more and they stay cool... Quote Link to comment Share on other sites More sharing options...
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