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Old 27th December 2019, 08:07 PM   #2241
Peter Daniel is offline Peter Daniel  Canada
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No need to balance any bias currents, just use 1K for R3 and keep everything else the same.
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Old 28th December 2019, 06:55 AM   #2242
M M is offline M M  Sweden
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Quote:
Originally Posted by Peter Daniel View Post
No need to balance any bias currents, just use 1K for R3 and keep everything else the same.
Thanks Peter!

Short follow-up question:
If I were to increase R1, would that require any bias balancing? I was simply looking at this from a standard op amp perspective, perhaps incorrectly.

/M
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Old 28th December 2019, 01:15 PM   #2243
Peter Daniel is offline Peter Daniel  Canada
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No problem changing R1 value, I usually bypass that resistor completely.
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Old 26th January 2020, 09:43 AM   #2244
slungu is offline slungu  Germany
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I got a 3875 standard kit and was wondering if I could use some 1000uF Panasonic caps instead of the provided ones that are 2700uF. I saw in the opening posts that C1/C2 were specified to 4.7uF-100uF and wanted to know what lead to higher capacitance in between back then and today.
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Old 26th January 2020, 04:13 PM   #2245
Peter Daniel is offline Peter Daniel  Canada
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Yes, no problem using 1000uF Panasonic caps.
C1/C1 are not recommended to be used any longer.

The main caps, Panasonic FC 1500/50, are sometimes on backorder, and then I need to substitute them with something else not to further delay order shipment.

Some people tried those 2700uF Chemicons in the past and claimed they sounded better then stock caps.
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Old 7th March 2020, 07:43 AM   #2246
MATJH1 is offline MATJH1
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I wondering if it would be possible to build a 3 channel power amp without a volume control to be used with a surround preamp?
or are there better suited amps for this?
Matthew
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Old 31st March 2020, 07:34 PM   #2247
M M is offline M M  Sweden
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Quote:
Originally Posted by Peter Daniel View Post
Yes, no problem using 1000uF Panasonic caps.
C1/C1 are not recommended to be used any longer.

The main caps, Panasonic FC 1500/50, are sometimes on backorder, and then I need to substitute them with something else not to further delay order shipment.

Some people tried those 2700uF Chemicons in the past and claimed they sounded better then stock caps.
Hi,

I'm in the process of building a second LM3875 kit right now; Hope you have time for a few questions:

- Should I now leave C1/C2 empty, not even use the 10uF caps?

- How would you recommend adding more capacitance nowadays if need be, only directly on the amp board?

- Is there any downside to mounting the led on the psu board since it is only driven by one of the rails, any risk for asymmetry between the rails somehow?

/M
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Old 31st March 2020, 10:40 PM   #2248
Peter Daniel is offline Peter Daniel  Canada
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Yes, leave those empty, or if you like, put some small caps there and listen if it makes any difference.
You can install big caps on rectifier board as per attached pic.
No problem with LED being powered from one of the rails.
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Old 31st March 2020, 10:42 PM   #2249
Peter Daniel is offline Peter Daniel  Canada
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Quote:
Originally Posted by MATJH1 View Post
I wondering if it would be possible to build a 3 channel power amp without a volume control to be used with a surround preamp?
or are there better suited amps for this?
Matthew
If 50W/channel is enough, it would be hard to find better amps for your application.
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Old 1st April 2020, 07:43 AM   #2250
M M is offline M M  Sweden
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Quote:
Originally Posted by Peter Daniel View Post
Yes, leave those empty, or if you like, put some small caps there and listen if it makes any difference.
You can install big caps on rectifier board as per attached pic.
No problem with LED being powered from one of the rails.
My ambition is to make this one better in terms of hum and noise. I am improving the wiring and ground handling significantly this time around. What should I do to improve hum and noise and achieve a more 'black' background?

Can the cap selection on the rectifier board and amp board somehow be made to improve this?
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