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You are right about Q1-4, I was in a rush, will fix it tomorrow. I can test things with a simple current mirror, but I usually resort to a Wilson if I am not using matched parts. Just habit, perhaps a

Looks about right, except the PNPs appear upside down. If you're going with emitter ballast resistors in the mirror, then you probably don't need transistor matching or the Wilson configuration, and

Also, here is the dimensional drawing of the outline for my breakout board: https://drive.google.com/file/d/1axeTjjcMswiNkfJGYOcPmpCzqPjXmuZ-/view?usp=sharing it seems to fit well with the plug-in

Here is the schematic for the digitally controlled current sink: https://drive.google.com/file/d/1VkWHA87e2c0EbP7M8WMywmGa2pkLtviQ/view?usp=sharing That needs to be duplicated for each row/column.

I agree Harvey and Silicon Valley is close to Palo Alto/ Sunnyvale/ Mountain View area. oops back to the original thread. (I have a 575 just obtained that is going to need work the only one upon quick

Silicone diode for reference: https://forums.arcade-museum.com/attachments/breakout_flyback_rtv_repair-jpg.405006/ The picture doesn't show it, but I added plenty of RTV silicone to the diode too

Silicone valley is obviously located in Hollywood. Harvey

Ha! Oh dear... I wrote that on my phone so perhaps I can blame autocorrect.... either way it's a good case for proof reading one's work. Yes I'd imagine silicone valley is in a different part of

I haven't started using Kicad yet, however, I do use Eagle. I'd do the following in Eagle, which you may find reasonable to do in Kicad. Set the grid to the connector spacing, generally 0.156 or 0.125

Awesome that would be great. I am kind of out of my depth on this one. The connectors on the board are Large connector in the front of the scope - AMP 3-530662-0-8301 Small connector towards the back

Well, I am glad someone said it. All day I was wondering about diode implants.... Jeff KruthIn a message dated 7/27/2021 7:19:21 PM Eastern Standard Time, rickc@... writes:?Dom, Diodes are

Ke-Fong Line wrote: No problem, I entirely missed the post as well when I was doing research for building my own TM500 prototyping boards a few months ago. Oddly, now that I have had the chance to

Simple mistake on the prototype wiring was the cause of the poor TS pulse detection previously reported. Here is what it should look like:

You might be talking about the loose tube in a box at the bottom of the picture. I mean a rack mounted unit between the two PCs. There are two scopes and a third thing, in the rack, that also looks

Dom, Diodes are made from many materials, but silicone is not one of them. a note of correctness: Silicone is a polymer used to make things slippery, as in a lubricant. Some adhesives are also made of

If you could check your book I would be interested to know if that picture is actually in it - the copy of it on archive.org does NOT have that picture in it! I suspect there were multiple printings

I think you'll need at least two TS detectors (like maybe the first and last), so you can figure out the actual running frequency and interpolate the rest of the slots. In my readout exerciser, it is

I'll try and get a schematic into the computer tonight and show you what I am thinking of. I wasn't talking about changing the edges of the TS pulses, just my circuit's response to those intentionally

My bad, I thought it was a new topic.

Looking at the waveform picture, I see that you're looking at speeding up the response of the TS detector, which is OK. I think I misunderstood that you were considering speeding up the actual TS