Oscilloscope trace doubler. Real or magic?

Thread Starter

Insertname

Joined Mar 15, 2011
12
Hi,

has anyone come across this beauty before? The basic idea behind it is to use a single input of an oscilloscope and display two waveforms with it from two separate inputs.

http://www.vk6fh.com/vk6fh/tracedouble.htm

The only other source I've seen for this is Newnes passive and discrete circuits by R.M. Marston on p. 167. This can be viewed on Google Books.


Thanks again for any input. This seems like it would be very handy for cheap DIY work.
 

bertus

Joined Apr 5, 2008
19,944
Hello,

The circuit is well known.
As the chopping frequency is only 30 kHz, the signals upto 3 kHz will be shown rather well.

Most circuits use a much higher chopping frequency and make use of "alternate" for higher frequencies.

Bertus
 

lightingman

Joined Apr 19, 2007
374
Yep.

Thandar did an eight way scope expander and a storage unit to go with the SC110.

Daniel.
 

Thread Starter

Insertname

Joined Mar 15, 2011
12
Excellent, thanks guys. A few more questions

Presumably, the 2 inputs you have can only have half the frequency of the main oscillator?


What's an eight way oscilloscope expander? It sounds interesting :)
 
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