pc based oscilloscope again

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uchwoody
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Joined: Fri Jun 18, 2004 1:01 am
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pc based oscilloscope again

Post by uchwoody » Tue Jul 20, 2004 6:16 am

I've got a circuit diag now. But i want 2 modify it a bit.I found an Ic , a display driver whose only purpose is just to signal when voltage level changes polarity. I thought of replacing it with something else, maybe an opamp,or voltage comparator. What d'u think?
Also, there's another ic (7402 I think) that has a 9v line going in, and a 5v line coming out. It looks like a power ic of some sort, but I can't identify it. Anybody have an idea what it is?

uchwoody
Posts: 11
Joined: Fri Jun 18, 2004 1:01 am
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Re: pc based oscilloscope again

Post by uchwoody » Wed Jul 21, 2004 8:40 am

I think I shd have used a different icon.
The power ic no is 7805(just that), it seems to have just 3 pins, one is 9v, the other is 5v, and 3 is common. The display driver is LM3914, I think it's used for a dot/bar display, cos it has output lines connected to leds.

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