Sammich sid + 6581R4AR

[anonyme-x22]

Hi,

I've just bought two piece of these.

I'm facing an issue in the filter section.

There isn't any cut off or resonance working in all filter mode.

The only thing i could get is a light volume increase at somepoint.

I use the 6581 motherboard setting and capacitors.

It's look like the filter section of these chip  are defective ?

Thanks in advance,

Have a good day,

Rgds,

[Hawkeye]

Hi,

do you have a classic C64 available for testing? With it you could relatively easily see if the filters are working. But you're right, there's a certain chance the filters are broken - these are by now quite old soundchips, the prices are inflated on ebay and people are probably also selling broken stuff (sometimes not even knowing it's broken, because they could not test it).

Best regards,
Peter

[anonyme-x22]

Hi,

Thanks for the answer.

After discussing with the seller. It seems he did sid bench test, but didn't record the signal, and don't used a spectrogram.

So i assume the end of the test was faulty and he didn't heard it.

What else cuould it be, i don't think the capacitor can completely remove the filter if set wrong, also putting back the swinn sid, no problem.

 

Does someone has experience with these one ?

Does it worth buying them,  do they all die with time, or certain can works endlessly ?

 

The sound of the real one is way ahed the swinnsid.

The mixed wave are totaly differents, specialy the tri+saw+pusle producing quite nothing while it does something on the swinsid!

Mathematical addition is not the same as analog addition i guess...

Why people are not doing new batch, it's not a difficult rechnology to reproduce!!!

sammichSID or whatever else without a real sid ar just bad vst...

Have a good day,

Rgds,

Edited September 23, 2020 by anonyme-x22