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Old 18th October 2003, 11:18 PM   #1
sss is offline sss  Israel
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Default oscilator needed

i need a square wave oscilator with output voltage of 0 to 12V
50% duty cycle and an easy ay to change the freq , what is the easiest and cheapest way to do that ?
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Old 18th October 2003, 11:42 PM   #2
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maybe this can help you

http://www.kitsrus.com/kits.html#k101
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Old 19th October 2003, 12:38 AM   #3
leon is offline leon  Greece
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Maybe with a NE555
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Old 19th October 2003, 12:59 AM   #4
sss is offline sss  Israel
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thanx guys
the 555 can give only 5 volts right?
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Old 19th October 2003, 01:32 AM   #5
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Quote:
Originally posted by sss
thanx guys
the 555 can give only 5 volts right?
No, just checked the Fairchild datasheet and it can give you
12.5 V @ 200mA and 13.5 V @100 mA, asssuming 15V supply,
of course.

Lucky for you I suffer from insomnia.
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Old 19th October 2003, 02:32 AM   #6
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IMHO I found that the 555 a bit fiddley for keeping the duty cycle constant
I would be tempted to run the 555 at twice the frequency and use a flip flop cct behind the 555 to divide by two and keep the duty a constant 50 pct
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