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| Non microphonic, 1uF SMT cap in a high Z circuit? |
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| Kleinstein:
100 nF C0G is not so bad anymore. Mouser has quite a few of them, starting at some 20 cents (Qt. 10). When limited to SMT it becomes more tricky with MKS and PPS caps may be more expensive. |
| floobydust:
Why speculate when you can just listen to the capacitor microphonics. I use the circuit here: https://www.eevblog.com/forum/projects/gravity-wave-detector-radio-electronics-april-1986/msg1103545/#msg1103545 I've had surprising results, some parts are very microphonic at high (vibration) frequencies, like a drum compared to a low thump. |
| Yansi:
--- Quote from: Kleinstein on March 24, 2020, 08:56:20 pm ---100 nF C0G is not so bad anymore. Mouser has quite a few of them, starting at some 20 cents (Qt. 10). When limited to SMT it becomes more tricky with MKS and PPS caps may be more expensive. --- End quote --- Interesting. I have just looked and stay being corrected. Couple years back I have designed a space constrained lowpass filters for an 8 channel audio codec, where I have used C0G caps. The largest value required I think 22nF and cost a pretty penny. |
| dmills:
Yea C0G has finally gotten useful for audio in places other then opamp stability caps. |
| Zero999:
--- Quote from: dmills on March 24, 2020, 03:39:22 pm ---It is a fet input chopper 'zero drift' part. Most of these loops are actually just stripping offset and bias currents off other bipolar opamps to avoid switch clicks and pot wiper noises. It is a little annoying as for myself I would probably just throw 1,000uF 6.3V electrolytics in place of all the servos and call it good, but 'no electrolytics' is a marketing point (Audio, what can you do?). Regards, Dan. --- End quote --- What? You're not allowed to use electrolytic capacitors, even in the power supply? :palm: What's the: Budget? Volume? Size constraints? Surface mount of through hole? Tolerance? Digi-Key sell 1µF 16V capacitor in 1206 size, but they're only 20% tolerance and are not cheap, even in quantities of 2k. https://www.digikey.com/product-detail/en/cornell-dubilier-electronics-cde/FCA1206A105M-H3/338-4076-2-ND/4431988 |
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