After my complaint about the noise floor on my mics, probably due to the usual phantom circuit, I spent some time breadboarding this afternoon. Doesn't seem...
... the ... does ... most ... look to ... There should be a Noise Figure on the datasheet. The 2n5087 is spec'd at 2dB and the NTE equivalent (NTE159) is...
I just now poked around some datasheets and figured it out. For some reason I ended up buying some BC558B, which have a higher noise figure but otherwise work...
... Those circuits use the FET inside the capsule in a "phase-splitter" circuit. This is neither a regular capsule nor a Linwitz mod, although it preserves the...
There has been a fairly long gap between our receiving the Transsound capsules and my having made any measurements on them. I spent some time yesterday...
... Interesting about the backplates. I have 9 of them (managed to ruin one, dont try soldering a wire directly to the capsule output) 6 have three holes...
... You must mean -105.7 dBV A-weighted here, right? ... Or 34.3 dB SPL equivalent A-weighted. Not very good at all. ... Do you have a signifigantly quieter...
... It would be very interesting to measure the ratio of front to back lobe of those and see if they were in fact tuned that way to be the same or if there is...
... Right. I meant dBV. It's not as though -106 dBV is noisy. It's that -46 dBV/Pa is not particularly sensitive. ... I'll post some very preliminary...
... Precisely. If it's gonna be that insensitive then a _really_ quiet FET is required. That relationship never struck me before. I wonder if it's as clear...
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Sep 5, 2004 12:45 am
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... Copyright is automatic - the authors don't have to assert it, although that does make things simpler. We should either contact them to ask, or simply...
... Really! So nothing I write and make available anywhere can be legally copied by anyone? I've got a couple of serious suits to file if that's the case. I...
... In general, yes. However, use of material is often acceptable so long as due credit is given to the author, and in the right circumstances. You cannot take...
... although ... So we have to draw a new schematic to drive WM-61A and Linkwitz mod with Phantom(P48) power? Is there anybody who drive them with Phantom?...
Copywrite is automatic and also automatically fuzzy. What you post here on a open public group you likely have lost the ability to control. And so you likely...
Well, not really. The original phantom circuits for these capsules (and still the ones some folks think are more correct* for various reasons) did use the...
... (and ... reasons) did ... now the ... also gets ... for the ... splitter ... showed ... I've got no ... issues ... members at ... mics for ... exposions,...
... Er, that might apply in the US, where I think the government takes the sensible view that the people have paid for it, so it belongs to them. Here in the...
A scary thing is hanging around this group and paying attention I am starting to understand the component level stuff here. That is a bit dangerous as I do...
You are right and the US gov is headed your way. Some of us in the US still believe that we have a gov that was founded on a principal that gov is by the...
... That won't work, the Zener noise is impressed on the supply voltage for the capsule. Back in the (pre-digital) day Zeners were used as noise generators for...
The zener noise is likely part of what I'm dealing with (problem #1 turned out to be noisy transistors). dayVel has basically just substituted 220uF for 10uF...
... turned ... 220uF ... might be ... are two ... I'm ... resistor ... bigger ... zener, just ... I've found that 220uF is probably overkill. I'm using 100uF...
... on the ... There's also a difference in the phantom cicuits we use that impacts the amount of zener noise. In the circuit you use, the zener connects to...
Dave, I've been meaning to ask you this for a while now, but never got around to it. Why does your phantom circuit not have a 10K resistor between the emitter...
... Aren't there any low cost, low noise, small footprint regulators that could replace the Zener in such a low current application? bob -- "Things should be...
... around to ... Your circuit is based on one that's been kicking around the internet for quite a while, but I didn't use that one. Mine is based on Scott ...
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