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Old 28th November 2008, 06:27 AM   #21
Mooly is offline Mooly  United Kingdom
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Loads of possibilities really. Can be as simple or as sophisticated as you want.
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Old 28th November 2008, 07:03 AM   #22
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I built the Sine-to-Square circuit that jgedde drew/posted above.

Works well too. Possibly better in that it has "flatter" tops. The "comparator" version had a touch of a slope (but may do better if I tweaked some component values).

I have not measured output current drive, or bandwidth yet...gotta work tomorrow.zzzzzz
No need to show waveforms...imagine nice squares.
(both were unaffected by my fluorescent work lamp.)

Click the image to open in full size.




=RR=
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Old 28th November 2008, 07:04 AM   #23
Mooly is offline Mooly  United Kingdom
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That looks good
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Old 28th November 2008, 12:25 PM   #24
jgedde is offline jgedde  United States
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Quote:
Originally posted by redrabbit

Alright, I'll try those next.
Did you draw up those tonight ?
Thanks, I appreciate it !!
Yes, I did whip them up. Only took a few minutes. No sweat.

You will get better drive capability by changing the 10k pot to a 1k...
John
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Old 28th November 2008, 04:07 PM   #25
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Quote:
Originally posted by jgedde
Try this... It uses what you have in stock. Don't forget power and ground on the 4013 (not shown).


Cheers,
John

Replacing the 4013 with the 74HC393, does this look right?
(grounding the unused CLK and the two Master Reset pins ?)

Click the image to open in full size.


(this stuff is re-peaking my interest to finish my modular synth that's been collecting dust.)

=RR=
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Old 28th November 2008, 04:23 PM   #26
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maybe look at ICL8038 function generator chip by intersil.
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Old 28th November 2008, 04:58 PM   #27
PMA is offline PMA  Europe
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MAX038 is fine. I get about 10ns rise time.
Attached Images
File Type: gif hrana1.gif (41.8 KB, 150 views)
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Old 28th November 2008, 05:21 PM   #28
bwaslo is offline bwaslo  United States
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Take a look at the 74HC4046 (or similar variants) phase-locked loop chips. They make a very nice, very square, 50% duty cycle, frequency adjustable stand-alone square wave generator at trivial cost (under a buck) and very little effort.

Ignore all the "phase comparators" and just use the Voltage Controlled Oscillator (VCO) portion of the chip. Selecting a few resistors (make R2 a pot to make it variable over a huge range) and a capacitor is about all you need. Couldn't get much simpler, and you can even control the frequency by a DC voltage if you want. Only weak point is not the best jitter so don't use it to clock your DAC.

If you use the 74HC, -HCT, or -LV types you'll be limited to ~5V P-P (though you can go to tens of MHz, should you want). If you don't want to fool with power supplies and need under a few 100kHz, get a CD4046 (or other metal gate version) and power it from a 9V battery (it can run from up to 15V).

Just go to digikey, and search under "4046". You can download the data sheet there, too.
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Old 28th November 2008, 08:23 PM   #29
jgedde is offline jgedde  United States
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Yup. Looks right...

John
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Old 30th November 2008, 09:47 PM   #30
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Put one in a Pomona box, with a +5v regulator, and a 9v battery.

Pics:
http://i5.photobucket.com/albums/y17...t/DSCN3562.jpg

http://i5.photobucket.com/albums/y17...t/DSCN3565.jpg



Works good.
There is a very faint skinny overshoot at the leading and trailing edge of the square...don't know if that matters.

=RR=
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