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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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25th June 2008, 08:08 PM
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4069 as variable resistor
I try to search the web on this (read about it a long time ago)->used a 4069 hex inverter as a variable resistor. Any idea on how this can be done?
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4th July 2008, 09:41 PM
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I don't see how it can be done, it's a buffer not a variable resistor.
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5th July 2008, 01:24 AM
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I've seem them used as a VCO and an analog amplifier, but never as a resistor. What are you trying to build?
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5th July 2008, 02:09 AM
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A long time ago the CD4007 was shown how it could be used as a variable resistor.
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Uncle $crooge |
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5th July 2008, 04:47 AM
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Switched capacitor filter?
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"Because I be what I be. I would tell you what you want to know if I
could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har." |
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5th July 2008, 05:17 PM
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Quote:
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I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez |
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5th July 2008, 07:19 PM
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Quote:
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Uncle $crooge |
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5th July 2008, 11:22 PM
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The neat thing about the CD4007 is that you have semi independent access to the individual MosFets in the IC and can operate both the P and N channel devices as open drain. Maybe prprog should use this IC or a discreet MosFet for his "voltage controlled resistor".
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--- The days of the digital watch are numbered. --- |
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6th July 2008, 01:11 AM
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He could also use a 4066 analog switch and has 4 bits to change resistor values.
Hans |
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