XLR to Minijack Repair
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From: Chris on 25 Mar 2010 18:26 I have two and 1/2 stereo adapters that take mic/line level inputs and match impedance (not sure on this one) to a 8/32" stereo phono jack for a video camera. We suspect that some of the x-formers are bad in the unit. Would this most likely be Low to high Z x-former or just 1:1 isolation transformers. The 1/2 side that works shows almost a short circuit on both sides of the x-former. However several of the ones that don't work show 5~600Ohms pure DC resistance. The 500Ohms sounds more normal for a small signal x-former than nearly zero. I plan on tracing the circuit with a scope and an injected sine wave to see where my signal disappears. However I am not able to find the x- former on the net. It has BEI MA392 R.2 RoHS stamped on the side. No other info. Thanks, Chris Maness
From: Gerard Bok on 26 Mar 2010 06:35 On Thu, 25 Mar 2010 15:26:18 -0700 (PDT), Chris <christopher.maness(a)gmail.com> wrote: >I have two and 1/2 stereo adapters that take mic/line level inputs and >match impedance (not sure on this one) to a 8/32" stereo phono jack >for a video camera. We suspect that some of the x-formers are bad in >the unit. One other possible source of confusion stems from the fact that there is no standard XLR wiring schema. So next to some units being faulty, you may be looking at wiring discrepancies. There is balanced vs unbalanced. And USA (2 cold, 3 hot) versus European (2 hot, 3 cold) -- met vriendelijke groet, Gerard Bok
From: Ron on 26 Mar 2010 06:39 On 26/03/2010 10:35, Gerard Bok wrote: > On Thu, 25 Mar 2010 15:26:18 -0700 (PDT), Chris > <christopher.maness(a)gmail.com> wrote: > >> I have two and 1/2 stereo adapters that take mic/line level inputs and >> match impedance (not sure on this one) to a 8/32" stereo phono jack >> for a video camera. We suspect that some of the x-formers are bad in >> the unit. > > One other possible source of confusion stems from the fact that > there is no standard XLR wiring schema. > So next to some units being faulty, you may be looking at wiring > discrepancies. There is balanced vs unbalanced. > And USA (2 cold, 3 hot) versus European (2 hot, 3 cold) > The standard for XLR wiring is 1 ground, 2 hot, 3 cold. It wouldn't make much difference if 2 and 3 were reversed as long as pin 1 was always ground Ron(UK)
From: Dave Plowman (News) on 26 Mar 2010 10:06 In article <XK-dnZnmXt9eEzHWnZ2dnUVZ8g-dnZ2d(a)bt.com>, Ron <ron(a)lunevalleyaudio.com> wrote: > The standard for XLR wiring is 1 ground, 2 hot, 3 cold. It wouldn't make > much difference if 2 and 3 were reversed as long as pin 1 was always > ground It certainly would if using two mics close together...;-) -- *Just give me chocolate and nobody gets hurt Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Ron on 26 Mar 2010 10:42
On 26/03/2010 14:06, Dave Plowman (News) wrote: > In article<XK-dnZnmXt9eEzHWnZ2dnUVZ8g-dnZ2d(a)bt.com>, > Ron<ron(a)lunevalleyaudio.com> wrote: >> The standard for XLR wiring is 1 ground, 2 hot, 3 cold. It wouldn't make >> much difference if 2 and 3 were reversed as long as pin 1 was always >> ground > > It certainly would if using two mics close together...;-) > Well yeah, on the other hand, two mikes close together may require the polarity of one to be reversed. But lets not complicate matters <grin> Ron |