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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Swapping Op-Amps... you have checked to see it's stable haven't you ?
Swapping Op-Amps... you have checked to see it's stable haven't you ?
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Old 19th October 2011, 09:39 PM   #31
Audio Maniac is offline Audio Maniac  Brazil
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I wish I had a scope but a second hand one costs about $300 here. It's too much investment for a hobby. It's not cost-effective at all.
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Old 19th October 2011, 10:37 PM   #32
RCruz is offline RCruz  Switzerland
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Swapping Op-Amps... you have checked to see it's stable haven't you ?
Yes it is
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Old 19th October 2011, 10:56 PM   #33
Audio Maniac is offline Audio Maniac  Brazil
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Caro Cruz,

I am DIY newbie. For me, it's not. He he he!

Abrašo!
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Old 20th October 2011, 05:22 PM   #34
Bonsai is offline Bonsai  Europe
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If you are swapping op-amps in your equipment for upgrade purposes, I have put up a 10 point check list up on my website.

http://hifisonix.com/wordpress/wp-co...oint-Guide.pdf
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Old 20th October 2011, 06:44 PM   #35
Mooly is offline Mooly  United Kingdom
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Swapping Op-Amps... you have checked to see it's stable haven't you ?
Excellent Bonsai...
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Old 23rd October 2011, 03:30 AM   #36
Bonsai is offline Bonsai  Europe
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Thank you sir!
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Old 23rd October 2011, 03:54 AM   #37
Audio Maniac is offline Audio Maniac  Brazil
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Bonsai,

I copied your check list!

Thx!
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Old 23rd October 2011, 10:14 AM   #38
Bonsai is offline Bonsai  Europe
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That great Audio Maniac. Good luck with your designs!

Let me also thank Mooly here for originally posting some waveforms up that triggered the discussion!
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Old 24th October 2011, 06:28 AM   #39
qusp is offline qusp  Australia
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fantastic Mooly!!, i admit to once being one of those opamp rollers, in fact its one of the things that got me started in diy. but in the years since, I've spent most of my time in those opamp threads warning and arguing with people about dropping opamps (mostly wideband) into circuits blind (cranky chips exactly like and most notably ad797, or arguing about the audible difference between ad797arz and brz, seriously).

one of my personal favourites is people performing specific modifications to put chips like buf634 and lme49600/10 into wideband mode for headphone amps.

I haven't yet got a scope, but its the next piece of kit for purchase along with a variac, already have bench voltmeter, 5 dmms and a few Jerry rigged add ons for testing gM etc
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Old 24th October 2011, 06:35 AM   #40
qusp is offline qusp  Australia
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and yes i'll be linking to this thread, although it seems many of these same people discount scope pictures as the work of the devil
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