I haz sammich

[Pete Brown]

Completed my sammichSID build. :) [insert dancing banana here]

http://10rem.net/blog/2011/10/22/just-completed-my-sammich-sid-build

I haven't used it a whole lot yet. I did notice that If I plug in a set of phones to the output, the SIDs are super noisy (I can hear the LFO sweep and the usual C64 noise). In the videos of the sammich, I don't hear any of that. What's the trick? Does regular amplification make it mostly go away, or do I need to do more work with the post processing? It was very loud, which I assume is some of it. I'll be able to tone it down a bit after I run to the store and get a proper stereo splitter cable. Not sure if that will be sufficient, though.

Pete

[Hawkeye]

Hi and congratulations to your build!

do you have standard 6581s?

They are fairly noisy... It is normal, that you always hear the oscillators, even if there is no note being played (SID specialty :)).

Also, depending on the patch/filter settings you can hear more or less noise, which is normal.

It could, of course also come from the PSU, which is more likely, if you employ a cheap switching PSU.

Greets,

Peter

[Pete Brown]

Hi and congratulations to your build!

Thanks :)

do you have standard 6581s?

They are fairly noisy... It is normal, that you always hear the oscillators, even if there is no note being played (SID specialty :)).

Also, depending on the patch/filter settings you can hear more or less noise, which is normal.

It could, of course also come from the PSU, which is more likely, if you employ a cheap switching PSU.

Greets,

Peter

Nope. I have the 6582As. I'll swap out the power supply for grins and see if that changes anything. The supply I've used isn't a particularly cheap one (it's a "medical quality" one from SL Power / Ault) with a three-prong grounded power cord, but you never know.

If you listen to my favorite sammich demo, there's no noise at all, not even when notes are playing (that I can hear, anyway), so I assume this isn't quite normal, and isn't just the result of turning off oscillators when not playing:

Pete

[Hawkeye]

Yes, i know that great demo in and out... :-)

You can employ a noisegate, which will create silence, when the sids are not playing... when they are playing, you won´t hear the chip noise... that is if there are no other problems... I once had a noisy PSU (due to a build error) which was not soo good, as it picked up stray noise from nearby switching PSUs from time to time.

Have fun with your new synth!

Bye,

Peter

Edited October 22, 2011 by Hawkeye

[Pete Brown]

I bought a proper splitter cable and plugged it right into my Motu 828. SID sounds much better now (through same headphones, but with the mixer in between)

Plugging headphones directly into the back is not a good idea: too loud and noisy.

Pete

PS. I can see on the front panel of the 828 that the SID is still throwing a fair bit of noise, but the 828 is filtering it out (gate or whatever). Nothing I ever set up, but nice to see it in play :)

Edited October 23, 2011 by Pete Brown