Search found 24 matches

by fwachsmuth
Sun 2019-01-13 19:20
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

I found it! It was too high load on GBUF. I use the MAX4741 switch and apparently some of the boards had a teeny tiny short between two pins because of a dent in my stencil! And since the MAX4741 is buried under a display, I missed that during visual inspection. Interestingly, some 1053 caused the h...
by fwachsmuth
Sun 2019-01-13 4:07
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

Hey guys, I have soldered ~30 boards so far (quite some work!) and about 15% don't work. The symptom is always the same: Right after powering on, the load on the 1.8V CVDD line is so high that my power controller shuts down after a second or two (it's peak current is 250 mA). I have failed so far to...
by fwachsmuth
Fri 2019-01-04 16:10
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

I did! The biggest challenge was fine tuning the PID controller in the end... to catch up timely, oscillate as little as possible and don't make changes which are too audible. BTW: Your Audio/Ground Considerations where gold. The thing sounds amazing. The MAX4741 is a bit pricey, but it was worth to...
by fwachsmuth
Fri 2019-01-04 10:17
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

Just so you know, I was finally able to finish this super niche project and soldered the first small batch of 10 boards. They sold within 3 hours! Not bad for a hobby project. :) The final result is here: https://www.filmkorn.org/synkino/?lang=en Thanks to all the great VLSI peeps for the thorough h...
by fwachsmuth
Mon 2018-04-09 10:23
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

That sounds promising. I guess tweaking a SCI_WRAM register should do the trick, similar as with 1053 playback?
I'll get my hands on a 1063 BoB soon to play with this. :)
by fwachsmuth
Fri 2018-04-06 8:29
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

I want to record Audio in sync to old film cameras — such as Super 8 or even using a (wind-up) spring motor. These cameras don’t run perfectly stable, often +/- 10% off the desired frame rate, and then not even steady due to mechanical challenges. My idea is to take the actual camera Speed (measured...
by fwachsmuth
Wed 2018-04-04 16:30
Forum: VSIDE
Topic: PCB design and ground layout considerations
Replies: 6
Views: 9505

Re: PCB design and ground layout considerations

Thanks, that helps big time for the next PCB revision.
by fwachsmuth
Tue 2018-04-03 20:46
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

Any hint or insight for me regarding Samplerate Finetuning while recording? Would be much appreciated :)
by fwachsmuth
Tue 2018-04-03 20:45
Forum: VSIDE
Topic: PCB design and ground layout considerations
Replies: 6
Views: 9505

Re: PCB design and ground layout considerations

Any hint regarding the ground plane? Seems I need to get a "Rev B" of my PCB made soon anyway...
by fwachsmuth
Sun 2018-03-18 22:47
Forum: Slave Decoder Applications
Topic: Can I change 1053 playback speed with a DDS as XTAL?
Replies: 35
Views: 3970

Re: Can I change 1053 playback speed with a DDS as XTAL?

Guys, thanks once again for all your great support. I finally managed to get everything going as intended and spent the last nights of my spare time on routing the PCB for my (currently three Breadboard spanning) project. Can't wait to get it delivered and see if it works. I'll keep you posted once ...