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Help sourcing a inductors summing amp
Help sourcing a inductors summing amp
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Old 17th May 2020, 01:42 PM   #1
pw8888 is offline pw8888  France
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Default Help sourcing a inductors summing amp

HI Guys,
I have a question regarding a summing amp that I am about to build.
I am posting the schematics and a picture of the original card.
could you help me sourcing this inductors and from what type it is exactly ?
We talk about L9 and L10 here.
the value is 15 uH.
thanks a lot !!

P
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File Type: jpg 15uH PICT 3.jpg (80.5 KB, 42 views)
File Type: png SHEM.png (253.1 KB, 38 views)
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Old 17th May 2020, 01:58 PM   #2
MarcelvdG is offline MarcelvdG  Netherlands
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They look vaguely similar to the TDK / Epcos (formerly Siemens) B82141A1154J or B82145A1154J or B78108S1154J.

B82141A1154J000 TDK Electronics Inc. | Inductors, Coils, Chokes | DigiKey

B82145A1154J000 EPCOS / TDK | Mouser Europe

Then again, there are more companies making colour-coded axial inductors. As long as they have the right value and about the right size, they will probably all work well.

Last edited by MarcelvdG; 17th May 2020 at 02:07 PM.
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Old 17th May 2020, 02:23 PM   #3
Ketje is offline Ketje  Belgium
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Inductance sortie axiale 15 mH 2.8 Ω 145 mA LGA0307-15 1 pcs. |
Conrad.fr
Oubien,
https://fr.farnell.com/sigmainductor...ale/dp/1173903
Mona

Last edited by Ketje; 17th May 2020 at 02:27 PM.
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Old 17th May 2020, 02:32 PM   #4
MarcelvdG is offline MarcelvdG  Netherlands
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Please forget post #2, as the ones I found all have a ten times too large inductance. Besides, they have 5 % tolerance, while the photo shows a silver tolerance band.
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Old 17th May 2020, 03:53 PM   #5
pw8888 is offline pw8888  France
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thanks for all your great infos !

silver is 10% precision right ?
could different brand affect the sound in a huge way ?

I am adding an other older version where they use as well inductors... seems to. use the same brand (maybe I am mistaken) (and where they use MAT02)

do I need to be careful. about something ? except the size and tolerance of course.
is there different "type " or technologies ?
thanks very much !

P
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Old 17th May 2020, 04:19 PM   #6
MarcelvdG is offline MarcelvdG  Netherlands
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This one looks similar to the original, Epcos B78108S1153K000:

https://uk.farnell.com/epcos/b78108s...0mhz/dp/608506

Silver indeed means 10 % tolerance. Similar inductors with a smaller tolerance should, of course, also work.

The inductors should not be driven anywhere near saturation by the signal currents, their parasitic capacitance should not be so large that it destabilizes the amplifier and their losses should be small compared to those of R279 and R289. I expect that just about any 15 uH axial inductor of about the right size will meet these criteria.
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Old 17th May 2020, 04:48 PM   #7
pw8888 is offline pw8888  France
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could this one be a choice ? (would like to order from mouser)

78F150J-RC Bourns | Mouser France


thanks !

P
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Old 17th May 2020, 04:50 PM   #8
MarcelvdG is offline MarcelvdG  Netherlands
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Yes, I expect it will work fine.
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Old 17th May 2020, 05:01 PM   #9
pw8888 is offline pw8888  France
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thanks !!
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