@segor you’ll find the tda’s for 4,20€ in stock. i hope someones opens a bulkorder
well at voti.nl they still sell the desired TDA1543 for 2,50 Euro … so where is the problem?
no problem, just TK suggested that the sound quality of the PCM1725 was better.
@Puddingbrumsel - 4.20 is too expensive. Another possible source for a (european?) TDA bulk order: http://www.ts-audio.de/pr_NED0008303.html
S
There are in Poland for 1,93 euro
some say sound quality of a TDA 1543 is better that a thing you should decide for yourself and your taste of how the sound is… 
but an other thing is price … look with one TDA 1543 or whatever DAC you choose you can connect TWO AVR’s for Sound so the Calculation goes
better than any original SID Chip… the Cheapest SID Chip I can get here in Germany will be around 15 Euro for the old 6581
or 20 Euro for the newer 6581 R4AR or the 8580R5 … for that money you can get a lot of AVR’s and even the DAC Chips…
so stop crying about the DAC Price… and start building and using them ;D
btw. the AVR mega 8515 used in here is about 1,70 Euro bei Reichelt.de and the 24MHz Oscillator is about 1,55 Euro
so for the Dualcore or Stereo SwinSID you need one DAC one 24MHz Oscillator and two AVR mega 8515 … do the math…
hey crisp,
I didn’t see anyone crying about prices?? I only said you can get the TDA cheaper than from Segor :). Actually I don’t see the SwinSid as a replacement for a real Sid because I expect a broken and dirty sound from a real Sid while I’d spend even more than for a TDA pr PCM1725 to get a really good sound from a SwinSid - for me the whole Midibox experience is absolutely not about saving money
S
over here in the US, i’m having a hard time finding the TDA1543… can i join a Euro bulk order if you guys start one? :-[
Small update:
* added swinkels’ C64/mb mod
* left TDA1543 in there for now
* size is now standard core size (holes match as well, well 3 of them at least)
* GND and +5V connections not shown (planes)
Could it be, that J2 isn’t 1:1 compatible to MBHP_SID:J2 and MBHP_CORE:J10? (10 pins instead of 8 pins)
Best Regards, Thorsten.
Could it be, that J2 isn’t 1:1 compatible to MBHP_SID:J2 and MBHP_CORE:J10? (10 pins instead of 8 pins)
Yes that’s correct. Two pins are unused, but 2x5 DIL headers/cables are just more common than 2x4 
This is not a “final” version, and what you just mentioned is one of the things I need to check and see if it needs adjustment.
Doesn’t anything go unnoticed in here?
How about using a half-can oscillator so you can move up IC4 and make room for a fourth screw hole? C14 could be moved somewhere else if you don’t want to be limited to a half-can. Also, something I like doing with oscillator footprints is make them capable of accepting either a half-can or full-can.
Uh-oh, this is turning into a hijack. Could a mod please split the thread?
Davo: Among the things I plan to change is adding a second footprint for the oscillator. Since the small ones are not really available everywhere, I will not remove the big one.
Also a design suggestion for the DualCore PCB, I would put the 24MHz Oscillator as near as possible to the CLK in,
so you may flip the AVRs and put the Oscillator to the left bottom side and the TDA to the right up-side…
This would minimise the RF noise of the Oscillator … I my desgin for the C64 I just put the Oscillator under the AVR but that reguires a thinner socket for the AVR
Just my thoughts … Maybe you share your schematic file? For playing around with the Parts position.
Also a design suggestion for the DualCore PCB, I would put the 24MHz Oscillator as near as possible to the CLK in
It sorta is - the whole thing is relatively small, so ideal placement is not really possible with my inferior newb-eagle-skills.
so you may flip the AVRs and put the Oscillator to the left bottom side and the TDA to the right up-side…
Feel free to do that
This would minimise the RF noise of the Oscillator … I my desgin for the C64 I just put the Oscillator under the AVR but that reguires a thinner socket for the AVR
If I did this, bugfight would *whack* me. Works well for crystals, kinda hard to do with oscillators as they tend to have a higher profile.
Just my thoughts … Maybe you share your schematic file? For playing around with the Parts position.
Just take the swinsid schem from swinkel’s site and merge it with the mbSID schematic and you’re good to go.
Small update:
* added J14 connector to allow for 1:1 cable
* separated ground planes (for analog part)
* added alternative footprint for the oscillator
* canged footprints of the caps from 2.54 mm to 5.08 mm
* some clean up
The master AVR is actually slave and vice versa. Both are ATMEGA8515, not AT89S8515 , therefore change their names to avoid confusion.
Already noticed and fixed. I tend to notice mistakes *after* I upload a screenshot I had the CS lines mixed up as well, right?
Yes they are swapped but no big deal.
Hmm, I’d scoot IC4 left a bit to avoid the mounting hole. Looks a little too close.
Syracuse Semiconductor on ebay USA have two potential deals: 100 TDA1543 for $350, or 500 for $500.00.
Edit: Both Digikey and Mouser have the PCM1725, both at $1.82 for 100 quantity, but both are SOIC. Mm, 14-pins, too. Choices…
Sorry to post that here; move or delete if appropriate…if I had the money, I’d just buy it and pass around the goodness..
Edit to crisp’s reply: You know how this goes; I’m hoping that someone will buy bulk for the inevitable 8 chip synth… The SwinSid sounds a bit less chunky than the SID, and has a silkier high end, perfect for polysynth applications. Congrats to the designers and developers!
Under Item number: 130202520908
they also offer now single TDA 1543
so you can grab as much as you need now…
Happy Soldering ;D
nILS, what is current status of your PCB layout? Is it finished yet?
Small building tip: New AVRs are running with internal 1MHz oscilator. To use external 24MHz oscilator please set ‘clock source’ fuse bits to 0000 (all bits programmed).