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I built my own scope with a B&W old mac. It works and the wave forms seen aren't great as they are perfect on a real scope. my question is how do I change the sync and how do I scope higher voltages. It can only go up to 3V. I tried a resistor divider and some transformers, although the transformers worked I can only use them for certain frequency ranges. And about the sync I compared the frequencies that worked on my scope with a real one and they were multiples of the 60Hz so I need to finde a whay to change that. If it is possible with a B&W TV though it may only work with a newer one.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
You need a variable frequency sawtooth generator (bipolar - swings +/-) for the horizontal sweep and some sort of amplifier for vertical (Y-amp). Then, to make it useful at all, you also need a triggering system, so it always starts draving the waveform from the same spot.
Do all that and you have a low bandwith scope. Might work up to some 100kHz if you're lucky. Nothing beats a real scope, though building one yourself is a great educational experience.
edit: A resistor divider should be fine... that's what they use on real scopes too.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
You'll need probes for higher voltages. If you're really serious about making a scope you'll have to get a real oscilloscope tube, otherwise you'll only be able to see low frequencies. TV tubes use magnetic deflection which is slow because of all the inductance, while scopes use electrostatic deflection, which is fast. I was going to build a scope once, but I couldn't find a scope tube, and once I got a real scope the project just wasn't interesting anymore. Heres a list of sites I found:
I have decided to get a scope but I am gona work on this for a learning purpose and thanks for all the help im taking it all in mined when making it better.
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Home made scope question
