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Re: Alternative HFEQ for Alice/Schoeps Circuits
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Sergei Steshenko
And smaller in size (6mm x 8mm) 100mH inductors: For some reason AliExpress switched language to French and currency to EUR. In USD the price is $1.27 for 10pcs - free shipping. --Sergei
On Tuesday, January 8, 2019, 4:14:50 PM GMT+2, Sergei Steshenko sergstesh@... [micbuilders] wrote:
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Anyway, since the public is interested in taming the 10Khz peak - here is a three component solution. Three elements should be connected in series in whatever order: 30mH choke, 8200pF capacitor and, say, 2.2K resistor. The LC value gives resonance frequency of 10.15KHz, and the R value determines the Q factor. I haven't simulated this, so the R value will have to be adjusted according the desired dip. The two free nodes of the three elements in series should be connected to source and drain of the FET respectively. If a narrower dip is needed, then try L=100mH and C=2500pF. Even the 100mH inductrors are small and affordable, e.g. . --Sergei.
On Tuesday, January 8, 2019, 11:55:50 AM GMT+2, Sergei Steshenko sergstesh@... [micbuilders] wrote:
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"one might want to start dumping HF at 5KHz and get the worst of the
hump and NOT chop off above 10-12K where the hump is rolling off
anyway?? A poor Man's wide-notch filter, or effect." - why not use equalizer after the mixer ? On can have an equalizer for a number of not so perfect microphones and write down slider positions for each microphone. I.e. it will take, say, a minute or two to readjust the equalizer according to stored values, but one doesn't switch microphones in real time. --Sergei.
On Tuesday, January 8, 2019, 2:04:36 AM GMT+2, ▌ P@T ▌ enjoybiking@... [micbuilders] wrote:
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HL, whenever this comes up I consider the two reasons I would use? it: - the economical 34mm capsules [taming that hump you can have a not-too-bad mike for very little $] and - The stock 16mm Chinese Mike capsules found in most donor-bodies [in private shoot-outs they have won some rounds as-is, but the have a HF rise or hump that can be cured somewhat].? I often think about the growing list of mods to tame the stock Chinese mikes.? and a third reason - I bought some crystal mike elements that have a pretty sizeable HF hump too.? So the shape or skirts of the filter, I have no sweeps in front of me but one might want to start dumping HF at 5KHz and get the worst of the hump and NOT chop off above 10-12K where the hump is rolling off anyway?? A poor Man's wide-notch filter, or effect.? Working with a economical donor body, a hump-dump switch could be employed too. -P From: "homero_leal@... [micbuilders]" To: micbuilders@... Sent: Monday, January 7, 2019 5:16 PM Subject: Re: [micbuilders] Alternative HFEQ for Alice/Schoeps Circuits
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I remember that in the original Jule's Pimped Alice Schematics, 470p caps where to ground. I have used them in both ways, with no aparent differences. Anyway, I just did a quick comparsion graph between Ricardo's LFEQ aproach using 750R and 8.2n, and the proposed alternative approach using the 18nf cap between JFET source and drain (470p and 22n also in place on both). Here is the FR graph: Ricardo's approach seems to be a little bit more agressive starting at 2kHz, but softens over 16kHz. Both have -3dB at about 16-16.5kHz. Kind regards! H
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