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Old 5th Jul 2016, 9:16 am   #1
pedrwilliams
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Default Practical Electronics November 1988 - Oscilloscope

I would like to obtain a copy of the oscilloscope construction articles which were published in
Practical Electronics November 1988
Practical Electronics December 1988
Practical Electronics January 1989
Plus any other articles/corrections re this project.
Many thanks for any help
Pedr
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Old 5th Jul 2016, 6:11 pm   #2
KeithsTV
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Default Re: Practical Electronics November 1988 - Oscilloscope

Here are the three articles. There was a "points arising" which I've included in the January 89 article.

Keith
Attached Files
File Type: pdf PE 1288.PDF (796.3 KB, 227 views)
File Type: pdf PE 1188.PDF (980.9 KB, 170 views)
File Type: pdf PE 0189.PDF (1.26 MB, 257 views)
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Old 6th Jul 2016, 5:50 am   #3
MrBungle
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Default Re: Practical Electronics November 1988 - Oscilloscope

Interesting articles. Building my own 'scope is on my bucket list.
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Old 6th Jul 2016, 8:17 am   #4
pedrwilliams
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Default Re: Practical Electronics November 1988 - Oscilloscope

Many thanks. This will be very useful!
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Old 6th Jul 2016, 8:23 am   #5
Radio Wrangler
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Default Re: Practical Electronics November 1988 - Oscilloscope

I remember that one. It is very, very, low performance the Y amplifier uses an opamp, but I can't remember which one, the timebase a 555, and there's only a couple of hundred volts on the CRT.

If you want a scope to use, to do anything useful, I'd suggest you don't bother with this one. If you want to build a scope for the educational aspects of it, then it goes part way but it doesn't show you the sorts of circuits and techniques in mainstream scopes.

Sorry to pour cold water, but I wouldn't want to see anyone put in the effort of finding the awkward bits (like the CRT) and then be disappointed.

David
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Old 6th Jul 2016, 9:44 am   #6
MrBungle
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Default Re: Practical Electronics November 1988 - Oscilloscope

It's definitely a toy scope, you're right there.

However there are some very high slew rate and bandwidth opamps available these days that are viable candidates for such a device. I reckon you could get a few tens of MHz bandwidth with a simpler design at the moment. Just looking at RS, you can see op amps that will hit 300MHZ Gain-bandwidth product for ~ 3
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Old 6th Jul 2016, 9:59 am   #7
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Default Re: Practical Electronics November 1988 - Oscilloscope

Hi Gents, there was a solid state design in WW in the 80's that I used for apprentice training.
It used a VCR 97 or similar and about 2Kv EHT as well as op amps and had reasonable performance. If you want a valve unit there were some good Philips/Mullard educational designs.
I can support you with various parts such as transformers, high value pots and tubes if you decide to build one.

Ed
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