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Old 29th December 2012, 07:00 AM   #21
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Join Date: Jun 2005
Location: Zürich
Also, when it asks for a time marker voltage with a repetition time of 1 us and an amplitude of 80 mV p-p, do I just need to convert the repetition time to a frequency for the oscillator?

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Old 29th December 2012, 08:20 PM   #22
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Join Date: Sep 2011
Location: Texas
Also, I hate to bother you guys again but my scope's crt light filter has been bleached by the lights at the top of the screen. Is there any inexpensive source of new colored plastic light filters? I guess that I could cut one to fit.

2X Com-tech 400, Improved Headphone Amplifier
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Old 30th December 2012, 04:39 PM   #23
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Location: New York State USA
Originally Posted by techbiker View Post

By the way, I have attached a picture of the front knobs with the blue tips removed. Notice the gray plastic pieces on top of the collet nuts. I cannot seem to remove these easily without destroying the knobs themselves. Let me know if you need more pictures.
Odd. Very odd indeed.

How about taking the covers off some of the small knobs and see what is in there?

I don't recognize what looks like some sort of button head nylon thing in the pictures. I have no idea what that is. My Phillips scopes all have brass collet nuts in that spot. Is it nylon, or did someone throw epoxy in??

Oh, afaik that is just thin colored plastic. Usually about 0.68" or less... approximately. Blue green type color.
Polycarbonate would be nice.
_-_-bear -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]

Last edited by bear; 30th December 2012 at 04:41 PM.
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Old 2nd January 2013, 05:36 AM   #24
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Join Date: Sep 2011
Location: Texas
Hi again!

Sorry about the slow reply. Those plastic pieces appear to be nylon as they are virtually perfect circles. I wonder how they can be removed without destroying the knobs? I ordered a new blue plastic optical filter from edmund optical Anchor Optics - Optical Cast Plastic Color Filters Hopefully this will be a big improvement over the nasty old browned one. I will let you know how it looks!

Elvee, does the 74hc390 itself provide divider networks? Could I use a different IC to pick a different set of networks?

Thanks again
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Old 2nd January 2013, 07:46 AM   #25
Elvee is offline Elvee  Belgium
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The 74HC390 is a digital divider, not a network (you need both). You could use a 74HC4040 instead, the ouput values would just be less convenient for mental calculations
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