Recent content by ttb

Thanks! I did that on the analog board so I believe the correct coding should be passed down to the logic board. The fact that it registers as 640x480 (though with a rolling image) makes me think it sees the sense lines in some capacity.

I have a Color Classic that I modified with the standard 68.4V VGA mod, as documented on https://powercc.org/640x480/ and elsewhere. This machine works perfectly with an LC575 logic board. I also have a Color Classic II and I'd like to standardize both with a VGA res. When I swap the CC2 logic...

I also run a 50MHz PowerCache in an SE/30. It runs A/UX 3.0 acceptably fast.

Haha, of course :)  I guess the only real reason to build one is if you want it to be long and/or thicker gauge. 

The standard ATX extension works great until you have to deal with one of the socketed logic boards. They have a capacitor next to the power connector that blocks the overhanging part of the connector. Unless folks have figured out a clever workaround I’m not aware of.    For crimping the...

Based on how jumbled those analog board capacitors are and the fact that they all appear to have a black marker dot on them I'd guess the analog board has already been recapped as well, but I usually mark them before removing them for recap so maybe someone was going to start the process and was...

What a thorough video, amazing. I can't be sure, but I believe that the Console 5 kits you mention at 48:00 likely include both the solid tantalum caps and Nichicon VX axial caps, hence their description. Someone who's actually bought the kit can chime in, though.

Edit: Now I see the OP hasn't replied for almost a year. Hope you've already figured it out! Are you saying the three middle pins closest to us in the second photo are not connected to the three vias because the little section of trace from the pad was obliterated? Just cut some short lengths...

Very interesting. Your peak voltage is similar to mine, but the your minimum appears to be much lower, resulting in the large p-p measurement. I believe that may be because you are pressing the interrupt switch repeatedly (e.g. from a sad Mac). The first signal captured by your scope is...

Alright, these measurements are from my other SE/30, recapped with the same caps. All are waveforms of the ascending tones played when the interrupt switch is pressed. I changed the system volume to 7/7 before testing.  Note: These are all with respect to ground. I also measured across the...

That should be even easier. To clarify, we're talking about probing C3, C4, and C5 voltages while playing the ascending tones? 

I'm just here to say that your desk/chair combination is a perfect match for the SE/30, great looking setup! 

If I have a couple hours this week I will open it back up and probe the rest of the circuit while playing the tone to provide the full picture. I'd imagine there is some difference from the fact that @aeberbach was playing a different sound, but that can't explain all of it.

I measured that 5.81 V p-p at the internal speaker header with the speaker connected. The measurement setup was the scope probe on the positive pin on the back side of J11 with the ground clip attached to a rear connector housing. The previous measurement I quoted was at the external headphone...

Alright, unfortunately I have bad news. The SE/30 with solid tantalum caps is my non-working unit, so I am unable to get the comparisons. My two functional SE/30s both have polymer tantalum capacitors. I did, however, measure the 1kHz waveform at the speaker jack (with the speaker plugged in)...