开云体育

Stretched Alice

[email protected] All Messages By This Member #36760 (First post) Hi,? I have been experimenting with small electret microphones (from Primo) mounted on goosenecks as violin pickups for busking (including classical repertoire). Visibly similar to a DPA 4099 but orders of magnitude cheaper.... Results are quite good: not as nice as my external SDC in the optimal position (and probably not as nice as the DPA!) but way better than any piezo I've tried.? I'm considering a next version with a slightly larger, FET-less capsule and an Alice circuit. The circuit would likely be too big to fit immediately next to the capsule, so would be distanced by around 15-20cm (6-8"). I am wondering how this separation of capsule and preamp would impact performance (e.g. noise, stability). Would it be better to stretch Alice by putting the 1G resistor and first FET with the capsule and the rest of the circuit downstream? I've seen the discussion on FET availability and the resulting OPA Alice. Are the 2N4416 and 2N 5087 still available (September 2024)? Would it be better to switch to an OPA circuit after the initial FET? For this application, it's a balance of sound quality (trying to amplify a good quality violin), directivity (to minimise feedback from amplifier), and practicalities (not getting in the way of the violin bow). Thanks for any comments! Jeremy
Scott Helmke All Messages By This Member #36761 开云体育 Hi Jeremy, I’ve done this sort of thing many times, putting the FET and 1G resistor right on the back of the capsule. Mogami makes some nice thin mic cable with two conductors and shield.? Thanks, -Scott? Sent from a mobile device. Please excuse my brevity.? toggle quoted message Show quoted text On Sep 3, 2024, at 7:20?AM, jeremy@... wrote: ? (First post) Hi,? I have been experimenting with small electret microphones (from Primo) mounted on goosenecks as violin pickups for busking (including classical repertoire). Visibly similar to a DPA 4099 but orders of magnitude cheaper.... Results are quite good: not as nice as my external SDC in the optimal position (and probably not as nice as the DPA!) but way better than any piezo I've tried.? I'm considering a next version with a slightly larger, FET-less capsule and an Alice circuit. The circuit would likely be too big to fit immediately next to the capsule, so would be distanced by around 15-20cm (6-8"). I am wondering how this separation of capsule and preamp would impact performance (e.g. noise, stability). Would it be better to stretch Alice by putting the 1G resistor and first FET with the capsule and the rest of the circuit downstream? I've seen the discussion on FET availability and the resulting OPA Alice. Are the 2N4416 and 2N 5087 still available (September 2024)? Would it be better to switch to an OPA circuit after the initial FET? For this application, it's a balance of sound quality (trying to amplify a good quality violin), directivity (to minimise feedback from amplifier), and practicalities (not getting in the way of the violin bow). Thanks for any comments! Jeremy
kennjava All Messages By This Member #36764 For the purposes of busking (... sound reinforcement) I don't know whether you'd hear any measurable benefit from the complexity of a FETless capsule plus full Alice circuitry, compared to a FET-equipped electret of the same size. ? How did your initial experiments go? Did you try any capsules with built-in FETs? Did you try omni as well as cardioid capsules? Omnis would be less susceptible to wind noise, but as you mentioned, feedback could be worse, unless the omni was really close to or under the strings. ? Interesting stuff. Tell us more!
[email protected] All Messages By This Member #36765 That may well be true. I'm also thinking of something compact that can go in the violin case and capture decent recordings when I don't have an external mic or stand handy.? An omni (EM172) right behind the bridge still picked up some feedback, so I'm experimenting with a cardioid (EM264) aimed at the soundhole, but currently working on improving the shielding of the capsule. Both 10mm capsules with built in FET. I didn't busk on windy days yet!? I'll let you know when I have some conclusions.
Arjay1949 All Messages By This Member #36766 I find the 16mm Primo cardioid capsules -- the EM200 and EM204 -- signifcantly better than the smaller capsules.? At 127dB the EM204 might not have a sufficiently high maximum SPL? level ? -- The EM200 is better in that regard, but needs a 3 wire connection.? ? I suspect you will need some wind protection, when using those capsules outdoors though....

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