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Old 1st June 2004, 12:08 PM   #11
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My scheme is split passive RIAA.
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Old 1st June 2004, 12:22 PM   #12
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Quote:
Originally posted by peranders
Nice work! Nice looking hand drawn schematic also.

Just wondering about C5 When You have gain more than 5-10 or this capacitors isn't very necessary, my opinion, but what is your reason for it?. Have you seen my LT1115/1028 vinyl amp.

P-A,

There happen to be 2 capacitors in the diagram called C5. I guess you mean the one on the 1st opamp?

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Old 1st June 2004, 12:26 PM   #13
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Quote:
My scheme is split passive RIAA.
Apologies. I should try keeping my eyes open
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Old 1st June 2004, 12:31 PM   #14
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Quote:
Originally posted by janneman
There happen to be 2 capacitors in the diagram called C5. I guess you mean the one on the 1st opamp?
This cap is only for trimming bandwidth (stability reasons) with low gains and in this situation is totally useless (my opinion). When you are going to use this pin, it's 100's of pF or even nF's.
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Old 1st June 2004, 12:41 PM   #15
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HA

Sorry, my mistake.

There is no significant influences at gain-bandwidth and slew rate with this capacitor here. Isn't very necessary to use this.

That was an experiment before and I forget to erase this.
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Old 1st June 2004, 12:48 PM   #16
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Oh but there is influence. That cap when left in will degrade the performance. BTW, the other C5 (1uF) is that part of the RIAA? Like low-freq roll-off?

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Old 1st June 2004, 12:52 PM   #17
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No with 10 pF, maybe with 100 pF or more.
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Old 1st June 2004, 12:53 PM   #18
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Quote:
Originally posted by janneman
Oh but there is influence. That cap when left in will degrade the performance. BTW, the other C5 (1uF) is that part of the RIAA? Like low-freq roll-off?
The size of the cap now will do nothing, not negeative either.

C5 along with the other resistors creates a drop at 50 Hz and a lift at 500 Hz. The last 2122 Hz is acheived by C4.
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Old 1st June 2004, 01:07 PM   #19
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C5 trim offset.

R7, R8 and C2 creates a drop at 50 Hz and a lift at 500 Hz.
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Old 1st June 2004, 01:17 PM   #20
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Treble pole is little higher than 2122 Hz maybe at 2170. Those sound better. If you want exactly 2122 Hz, R12 will be 7,5 kohm.
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