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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Does yours work at 22MHz hazmatt?
As for how "good" a square wave something gives at these frequencies, remember that a 20MHz or even a 40MHz or 60MHz scope isn't going to give an accurate picture of what a 22MHZ square wave really looks like. We have a 400MHz analog scope in our lab at work, and if you prod a digital circuit with it, the waveforms look shockingly different to what you get with a regular scope. Not usually in a nice way!
*edit* I forgot the bit about modslapping Firkragg and BP into the middle of next week if they don't quit arguing about whose parents can or can't afford laser cutters.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
'regular' probes can own few hundred pf of capacitance as minimum, and this detoriates squarewave at such frequncies.
Maybe we could use just a small pece of coax cable with BNC connected directly to scope to minimize the capacitance for squarewave measuring (messy but may be useful sometimes).
*edit* I forgot the bit about modslapping Firkragg and BP into the middle of next week if they don't quit arguing about whose parents can or can't afford laser cutters.
Hey, I actually wanted to say that his CNC cutter is cool (including acrylic stuff cut with it). Didn't want you to think I'm all in jealousy or something and my emotions are leading me into evil. ^^ :)
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Steve, the chips can handle 40MHz without a prescaler
And I can count as high as I want, provided I have enough digits
My counter works great up to 100Hz standard timebase input. After that, reading the digits becomes a bit difficult. But with 100Hz, 8 digits, and a prescaler option, you have a sweet and simple versatile counter.
If you guys want, I can post details once im done with my DSP and Physics tedium.
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
That's nice BP! I started building one about two months ago, and so far the boards are just sitting there. All that's left is Assy, I even made a nice box out of aluminum.
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cheap thrills signal generator
(including acrylic stuff cut with it).