[sdiy] Weird Yamaha CS40M problem

[Antti Pitkämäki]

Hi,

I finally replaced the 4558. Somehow I wasn't surprised that it didn't fix
the issue :(

Well, I just have to continue chasing the source of this problem...

Antti

ma 20. syysk. 2021 klo 22.22 Antti Pitkämäki <antti.s.pitkamaki at gmail.com>
kirjoitti:

> Thanks, Steve! Generic 4558 it is, then :)
>
> I'll report the results!
>
> Antti
>
> ma 20. syysk. 2021 klo 18.06 Steve Lenham <steve at bendentech.co.uk>
> kirjoitti:
>
>> On 20/09/2021 13:05, Antti Pitkämäki via Synth-diy wrote:
>>
>> > How critical is for the 4458 to be exactly the same (NJM4458DV)? I
>> found
>> > a source for those for like 13 euros per part + postage, but my friend
>> > has generic 4485s that I could just fetch for free. The role for the
>> > 4458 is to buffer the input of the VCF.
>>
>> I know the CS40m schematics specify NJM4558DV, and that photos of
>> NJM4558DVs exist, but I cannot find any datasheet that assigns any
>> meaning to the final "V".
>>
>> If you just search for NJM4558D (and it is 4558, not 4458 or 4485!) then
>> you will find that they are still in production and cheaply available.
>> The D means it is in a DIL package as opposed to SIL or SOIC.
>>
>> But I would go further and say that in that circuit you would be safe to
>> use literally any version of the 4558 that fits. It is only acting as a
>> unity-gain buffer. Grab a generic one from your friend.
>>
>> Good luck!
>>
>> Steve L.
>> Benden Sound Technology
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>
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