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Chip Amps Amplifiers based on integrated circuits

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Old 11th November 2019, 02:28 PM   #301
FauxFrench is online now FauxFrench  France
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Hi Chris,
Sorry for the delayed reply. I was traveling for a couple of days.

The 100pF capacitor should be of the foil type for best linearity and minimum noise.

Good systematic work (as always) when measuring the frequency response. 0.3dB at 17KHz is no problem.
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Old 11th November 2019, 08:10 PM   #302
chermann is offline chermann  Austria
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Thanks FF


have to look -actually nothing with 100pF in my box...just ceramic
chris
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Old 11th November 2019, 09:03 PM   #303
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by chermann View Post
Thanks FF
have to look -actually nothing with 100pF in my box...just ceramic
chris

The ceramic are fine for deciding the value. For your level of detailed listening, the type may be noticed.
I am not in my lab right now but as I recall, my storage is also ceramic.
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Old 12th November 2019, 07:10 PM   #304
chermann is offline chermann  Austria
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Hi FF


Thank you for your time and help. i try to get a foil type cap for this.
2nd i have to start up with the second amp for better SQ compare....
chris
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Old 13th November 2019, 01:32 AM   #305
rabbitz is offline rabbitz  Australia
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I've only seen ceramic NP0/C0G used in that location. Neurochrome used a TDK FG28C0Gxxx on one of their amps I have in that location and I've also used Murata C0G for similar use in op amp circuits. I don't know if silver mica would be suitable as I've used them on small pF applications as are said to be better.

This is only an observation as I'm only an amp builder.
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Old 13th November 2019, 06:14 PM   #306
chermann is offline chermann  Austria
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Thank you rabbitz for your observation to this topic.

your are not just an amp builder in my view
chris
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