Fred Salles Posted November 13, 2023 Report Share Posted November 13, 2023 Hello, this is the second shoot in a raw where I encounter issues with Battery eliminator from Lectrosonics from rental house equipment. Woobling noise in the receivers. Both problem solve by switching to batteries. Strange thing is that the transmitters and their problematic battery eliminator were both different models. Last month an old UM200 with its 9v batelim (rx R1a) and this month a more recent SMDWB and its SM batelim (rx IFBlue) Both almost similar noise although much louder on UM200. It happened at any voltage stage of my power system: switt VLock 180wh on vlock plate and xlr4 output. The vlock plate output is point to point here but it also provide regulated voltages on usb C and DC 2.5. I have sennheiser G3 TX and lectrosonics LR RX running with battery eliminator without problem at all. Recorder SD888, powered by the same circuit. it seems to me that some battery eliminators have switching regulator with a frequency that somehow generate audible artifact in some situation and not others. I still have to explore the issue further but I am on set on a feature for now so no time. Any idea welcome Quote Link to comment Share on other sites More sharing options...
Mungo Posted November 14, 2023 Report Share Posted November 14, 2023 Happens with many battery eliminators from any brands, as long as different components are supplied by one power source. You're quite lucky not having this issue with G3 as I had (Sennheiser DC2 converter). You can get rid of this by isolating. Meaning on the one hand with a balanced audio connection (not always possible and not always working) or on the other hand using a DC/DC converter with galvanic isolation. DC/DC converters in a chain, meaning first isolating with one converter and after that converting voltage with another device unfortunately may also not work. For me, I ended up making my "own" battery eliminators by soldering in parts from Traco Power THB series. That always works with any audio device, even with the cheapest consumer Bluetooth dongle. Quote Link to comment Share on other sites More sharing options...
pt Posted November 14, 2023 Report Share Posted November 14, 2023 One of these will do the trick https://www.audioroot.fr/product/gle-12w/ Quote Link to comment Share on other sites More sharing options...
Fred Salles Posted November 14, 2023 Author Report Share Posted November 14, 2023 Thanks for your inputs. Mungo you must be right, I assumed the Lectrosonics were all isolated. These ones might not be. 10 hours ago, Mungo said: You're quite lucky not having this issue with G3 as I had (Sennheiser DC2 converter). Indeed I made these ones myself, with miniature isolated dc regulators. Do not remember which brand I used but either Traco or XP power. Actually they might even be simple linear dc regulators, if I remember correctly. And linears do not need isolation isn’t it? Quote Link to comment Share on other sites More sharing options...
Mungo Posted November 15, 2023 Report Share Posted November 15, 2023 13 hours ago, Fred Salles said: linears do not need isolation isn’t it? Guess so. GND/minus is connected, so there are just 3 pins: in, out, GND. Isolated ones have at least 4 pins: in+ in- out+ out- Quote Link to comment Share on other sites More sharing options...
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