| Electronics > Projects, Designs, and Technical Stuff |
| How to drive 20V digital signals? |
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| ebastler:
--- Quote from: FenTiger on October 04, 2019, 09:02:26 pm ---VFD driver? https://www.maximintegrated.com/en/products/power/display-power-control/MAX6921.html It'll take some software work on the non-legacy side. --- End quote --- Hmm, that's an interesting thought actually. I had come across VFD drivers in my search, but always skipped them when I saw the SPI interface. But come to think of it: I need to update my outputs at approx. 130 kHz, so I have a few µs to send the contents. There is only one fast bit which I need to set more quickly in response to new inputs from the LGP-30, but I could deal with that one separately. The rise times and propagation delays of the MAX6921 are still marginal, but I will have a close look at that chip and other VFD drivers. Thanks! |
| SiliconWizard:
--- Quote from: ebastler on October 04, 2019, 07:08:07 pm --- --- Quote from: RoGeorge on October 04, 2019, 07:03:28 pm ---What vintage interface/computer has had a 20V digital signals? --- End quote --- The LGP-30 from Librascope/General Precision. --- End quote --- https://en.wikipedia.org/wiki/LGP-30 Damn. Even @legacy will appear to work with cutting-edge technology now... 120 kHz, 1500 W. Hehe. Reading the "Starting the machine" was entertaining too. ;D |
| ebastler:
--- Quote from: SiliconWizard on October 04, 2019, 09:21:18 pm ---https://en.wikipedia.org/wiki/LGP-30 Damn. Even @legacy will appear to work with cutting-edge technology now... 120 kHz, 1500 W. Hehe. Reading the "Starting the machine" was entertaining too. ;D --- End quote --- Yes, great fun! :) The LGP-30 has an amazingly tight architecture. The actual CPU only uses 24 tubes! Bit-serial operation, tightly integrated with a magnetic drum, which serves as the working memory and provides some clock and timing signals. All designed by one man, Stan Frenkel, and it really shows in how close all the components are intermeshed. I originally dug into this building an FPGA replica: http://e-basteln.de/lgp30/. But now I get to play with and restore a real one here: https://www.technikum29.de/en/computer/lgp30 |
| SiliconWizard:
--- Quote from: ebastler on October 04, 2019, 09:27:47 pm ---The LGP-30 has an amazingly tight architecture. The actual CPU only uses 24 tubes! --- End quote --- Yes, I was amazed to see the specs and then look at the size of the machine. Even the power draw was still not that bad for such a machine... |
| ebastler:
--- Quote from: SiliconWizard on October 04, 2019, 09:35:08 pm ---Yes, I was amazed to see the specs and then look at the size of the machine. Even the power draw was still not that bad for such a machine... --- End quote --- It sits on casters, and just needs a regular wall outlet for power. The first "mobile" computer which you could roll over to your desk! :-+ |
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