Hello, I need help to determine the value of VR2 and C12 (pin 6 and 7). For my project I need a base frequency of 400 rpm and a running speed of 4000 rpm. I also determine a R26 (pin 11) at 10k for a 100k VR1. With these values, what is the value for C12? Thank you, Miguel
On-board Oscillator with CMOS 4046
May 12, 2014
8 Replies
"Miguel Cardoso" schreef in bericht news: snipped-for-privacy@googlegroups.com...
Hello, I need help to determine the value of VR2 and C12 (pin 6 and 7). For my project I need a base frequency of 400 rpm and a running speed of
4000 rpm. I also determine a R26 (pin 11) at 10k for a 100k VR1. With these values, what is the value for C12? Thank you, Miguel*** You can find the datasheet at:
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petrus bitbyter
try 200 pF.
Try 12nF. I think the OP is after 400 - 4000 cycles per minute (rpm), not cycles per second (Hz).
Andy
right, so divide by 60 and you have your Hz.
looks like 6.666 to 66.666 Hz.
Jamie
Jamie
And then try something else. Perhaps a pattern will eventually start to show.
I do believe there are nomographs in the datasheet. ...Jim Thompson
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I love to cook with wine. Sometimes I even put it in the food.
But the spread about the typical value is slooooopppppyyyyyy.
Cheers
Phil Hobbs
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
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hobbs at electrooptical dot net
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Segunda-feira, 12 de Maio de 2014 10:48:52 UTC+1, Miguel Cardoso escreveu:
I had to change the speed to 1Hz (60rpm) and 10Hz (600rpm) With these values, what is the value for VR2 and C12?
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