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eBay mono LM1875 kit
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Old Today, 05:57 AM   #221
chermann is online now chermann  Austria
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Join Date: Jan 2017
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Hi


measured direct on the +V -GND -V terminals at the amp board.i add 3300F on each rial.is not better 100Hz ripple with 188mV -before 220mv...so more caps = ripple gets down.....i will have a closer looka t my space in my mock up /housing


maybe rabbitz your are interesting to add some more caps ?...and report back about the changes = SQ




pic 1 +V
piv 2 -V



chris
Attached Images
File Type: png ripple L channel cap bank +V_3.png (55.6 KB, 23 views)
File Type: png ripple L channel cap bank -V_3.png (56.0 KB, 21 views)
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Old Today, 01:04 PM   #222
rabbitz is offline rabbitz  Australia
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Chris

I now use a supply with 50VA 18-0-18 and 2/4700uF caps (first pic). I can try the supply I use on the LM4780 which is 120VA 18-0-18 and 2/10000uF caps (second pic).

I'll have a listen over the next few days and see if there is a difference.

You are certainly getting into this. I just build and then listen and if it sounds good all is well. If not, it gets binned.
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File Type: jpg RZ50VA.jpg (212.6 KB, 15 views)
File Type: jpg RZ120VA.jpg (185.2 KB, 14 views)
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Old Today, 03:17 PM   #223
chermann is online now chermann  Austria
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interesting too should be what happened if you add caps at the V+ - 0 - -V Terminals
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Old Today, 05:28 PM   #224
chermann is online now chermann  Austria
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Quote:
Originally Posted by chermann View Post
yesterday i want to order the chips over the TI shop.
20 pcs -- with delivery 6,99 and TAX 18,55 !!! i should pay 84 euro !!!
sorry guys thats not acceptable !

over digikey i have 20psc about 52 euro - deliver cost not inluded but normally 20% = 64 euro !

chris



Today arrived TAX 11,60 +52 parts = 64 euro for 20pcs
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Old Today, 06:28 PM   #225
chermann is online now chermann  Austria
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Quote:
Originally Posted by chermann View Post
Today arrived TAX 11,60 +52 parts = 64 euro for 20pcs
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File Type: jpg digikey_LM1875_2.jpg (541.5 KB, 0 views)
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Old Today, 06:33 PM   #226
chermann is online now chermann  Austria
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Join Date: Jan 2017
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Hi rabbitz
here some titles to support the feeling of background music. these helsp a little bit..



Black Crow (europa live 1994) / Artist Cassandra Wilson
Peter and the Wolf by Prokofiev / Abbado


chris
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