- This topic has 5 replies, 4 voices, and was last updated 4 years, 5 months ago by Guenther.
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2020-January-17 at 15:32 #8145GuentherParticipant
First Mr. Birett mentioned an oscilloscope built by Mr. Guerth to visualize the peak when a ferrite core (one part of a ferrite core memory matrix, the very first permanent memory for early computers…) was magnetized.
I asked later Mr. Guerth and he remembers “his” unit, but he had no schematics or photos. In 2017 – I believe – we found in the archive of RWO the photos of this development – what a surprise!
The used display tube must have been a DG3-12A – this is hard to find and so I purchased the monitor of a VHS camera. My Lectron block looks like this:
…but to be honest: I have no knowledge how to drive the monitor as an oscilloscope… needed: horizontal / vertical deflection stages, trigger functions and the like… So it’s in my “Incubator” for future developments.
Meanwhile I purchased a DSO (PRoC) for extreme little money incl. shipping, built a Lectron-like block and did first measurements like this:
Quite nice, isn’t it?
The original ready-built unit in a acryl case looks like this:
Best,
G.
- This topic was modified 4 years, 9 months ago by Guenther.
- This topic was modified 4 years, 9 months ago by Guenther.
- This topic was modified 4 years, 9 months ago by Michael. Reason: Changed font and size styling for easier reading
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2020-January-18 at 14:03 #8150MichaelKeymaster
Great stuff Günther! You are always the premier innovator 🙂
Best,
M. -
2020-January-19 at 05:55 #8151GuentherParticipant
To complete this topic I built the sawtooth generator (see photo #1) and connected the DSO:
The DSO display more in detail:
… and so the oscilloscope display from photo #1 may have been looked like (diameter ~ 2.75 cm = 1.1 inch):
Best,
G.
- This reply was modified 4 years, 9 months ago by Michael. Reason: Changed font and size styling for easier reading
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2020-January-24 at 19:45 #8207LectronFanModerator
Wow Guenther, this looks neat and nifty !
A perfect add-on for all oscillator circuits.
You also made a great looking Lectron block for it !
Greetings
- This reply was modified 4 years, 9 months ago by Michael. Reason: Changed font and size styling for easier reading
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2020-May-11 at 23:50 #8654bodgerParticipant
Magnetic deflection is tricky, as the deflection coils have significant inductance. I have quite an assortment of small electrostatic CRTs, I might be able to supply one that’s appropriate if you wish to try.
I have also been experimenting with magnetic core and have been able to observe the pulse coupled into the sense wire when it changes state.
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2020-May-14 at 15:31 #8664GuentherParticipant
Electrostatic CRT – That sounds good, but I am currently being filled with a lot of work, so I may come back to your offer later this (or next) year.
Mr. Max Guerth (external “Lectroneer” 1968 – 1971) experimented a lot, e.g. with ferrite core like circuits like this:
Best,
Guenther
- This reply was modified 4 years, 5 months ago by Guenther.
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