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Sugarland

800 power supply caps replace

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1 hour ago, Sugarland said:

Thanks everyone for the advice and feedback!  Would the SCCC by tf_hh fix the wavy video produced by the TRACO TSR 1-2450 line converter?

Not an expert but I suppose so, since it includes UAV and UAV has a "clean" power supply for the video circuit. Best send a PM to tf_hh who should know best and can sell you one if you need it.

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5 hours ago, slx said:

Not an expert but I suppose so, since it includes UAV and UAV has a "clean" power supply for the video circuit. Best send a PM to tf_hh who should know best and can sell you one if you need it.

I dunno. The UAV's "clean" power is only as clean as the ground-plane of the system it's installed into. The 800 generally has a cleaner and better ground than the XL's and XE's, I think, so if that line converter is pruducing that much noise, it seems like a better long-term solution is simply remove those and go back to standard voltage regulators. I've NEVER had a bad VR in an A8, 5200 or 7800. I've had one marginal one on a 2600 Vader that I went ahead and replaced while I was replacing the chiclet caps anyway. 

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1 hour ago, DrVenkman said:

I dunno. The UAV's "clean" power is only as clean as the ground-plane of the system it's installed into. The 800 generally has a cleaner and better ground than the XL's and XE's, I think, so if that line converter is pruducing that much noise, it seems like a better long-term solution is simply remove those and go back to standard voltage regulators. I've NEVER had a bad VR in an A8, 5200 or 7800. I've had one marginal one on a 2600 Vader that I went ahead and replaced while I was replacing the chiclet caps anyway.  

 

Alright thank you DrVenkman! What voltage regulators would you use on a man-portable particle accelerator system that is used to create a charged particle beam composed of protons?

 

Edited by Sugarland

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6 hours ago, slx said:

Not an expert but I suppose so, since it includes UAV and UAV has a "clean" power supply for the video circuit. Best send a PM to tf_hh who should know best and can sell you one if you need it. 

 

Thank you. I got one yesterday in the mail. Very random (and awesome) device to get in the mail, too!

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No VRs for that application - you want as much voltage as possible to charge the accelerator. Just don't cross the streams. ;) 

 

 

Edited by DrVenkman

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1 hour ago, Sugarland said:

 

Thank you. I got one yesterday in the mail. Very random (and awesome) device to get in the mail, too!

Yeah, tf_hh‘s packaging is as neat as his designs. I didn‘t even know anti-static zip-locs existed before I bought stuff from him. 

 

When UAV was still in development someone (guitari?) designed a little add-on audio board to get a complete audio out and tf_hh incorporated that into SCCC as well rather ‚last minute‘. 

 

So I really do hope he goes ahead with his dual PAL/NTSC and maybe even 65C816 compatible Super SCCC. There‘s an 800 waiting here 😀

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Bryan did an Audio Companion board but only one run of them. I don’t think that got much community traction; certainly not as much as the UAV. 

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5 hours ago, DrVenkman said:

Bryan did an Audio Companion board but only one run of them. I don’t think that got much community traction; certainly not as much as the UAV. 

IIRC they were intended for use on the 400 only, as all other machines have a point to pick off audio. suitable to send to a standard monitor connector. I got two but didn't need them on my 400 as the SCCC contained the circuitry already.

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20 minutes ago, slx said:

IIRC they were intended for use on the 400 only, as all other machines have a point to pick off audio. suitable to send to a standard monitor connector. I got two but didn't need them on my 400 as the SCCC contained the circuitry already.

I know a few folks used them in the 7800 as well. Bran designed it to provide balanced signals for both TIA and POKEY without needing to balance things with a filter cap or discrete resistors. 

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7 minutes ago, DrVenkman said:

I know a few folks used them in the 7800 as well. Bran designed it to provide balanced signals for both TIA and POKEY without needing to balance things with a filter cap or discrete resistors. 

Great, then I might still have a use for them!

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Based on experience, you may still get noise/jail bars coming through the display even with the SCCC / UAV installed if you don't have clean power or a decent ground from the vertical block.

 

Once I fixed up the grounding issue, I had a very nice and clean picture on my 800 that surpasses the display in any of my other 8bits.

 

 

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No vertical banding, no bars, no video upgrades (other than R189), no nothing.... on basically stock 800. 

 

AAA57644-7E3A-44C2-89E0-220A9263101A.jpeg

 

Good video processor (or any other well implemented analog-to-digital video path) will take care of everything, with proper signal normalization and sharpening control.

 

Edited by Faicuai
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