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Old 11th April 2014, 11:23 PM   #1
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Default guitar pickup pre / phase flipper

hello

i am designing an instrument where i need a preamplifier stage for a guitar pickup, with a PIC controlled CMOS switch that can flip the phase of the buffered/amplified signal.

the switch needs to be a CMOS (i'm using a 4066) for various reasons - so i came up with this circuit combining ideas i found on the internet... it uses both channels of a TL072 IC.

http://i.imgur.com/HM4dIev.jpg

will this design be able to do what i want it to do? i'd love to hear your thoughts on the idea!

thanks for your help,
dataplex
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Old 11th April 2014, 11:43 PM   #2
Zero D is offline Zero D  United Kingdom
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Hi, i think this might be better !

I've drawn the switch as a mecnanical one, but i hope you can see how to transpose it to CMOS ones ?
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File Type: png Zero d 4 dataplex.png (3.4 KB, 41 views)
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Old 12th April 2014, 12:11 AM   #3
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hey zero d - that looks very cool! thanks!

is it really that simple? im not sure how to convert the 4066 to a spdt... thats what i need, right?

im really trying to understand these things, thank you so much!
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Old 12th April 2014, 12:21 AM   #4
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Yes, ZD's is much better than the one you found imho. His will work.
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Old 12th April 2014, 12:23 AM   #5
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yes it looks very simple and clean - however i don't see any amplification going on, should i change the feedback resistor to 100k?
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Old 12th April 2014, 12:25 AM   #6
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Do you want the same gain for both + and - phases? If so, then a little more design work may be required.

But you're right, as the circuit stands there is no gain either way.
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Old 12th April 2014, 12:29 AM   #7
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You can convert a 4066 to DPDT by using two switches with one control inverted from the other. You could also choose to use a 4052.
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Old 12th April 2014, 12:30 AM   #8
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yeah i need the same gain for both - and + phase signals. ideally amplification within the 20 - 40dB range using a (10k?) pot while i am fine tuning the rest of my circuit. at this point im not sure how hot i need the signal to be.

also, since the CMOS chips i'm using are the 4066 i'd have to configure them to do dual throw (which im not sure is even possible, maybe my brain needs some more coffee).

furthermore im concerned that a hi-z guitar input signal wouldn't pass nicely through a CMOS chip without some prior amplification......
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Old 12th April 2014, 12:31 AM   #9
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Put your preamp stage before ZD's circuit, then you have same gain, plus phase switching. There ya go.
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Old 12th April 2014, 12:31 AM   #10
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Quote:
Originally Posted by poynt99 View Post
You can convert a 4066 to DPDT by using two switches with one control inverted from the other. You could also choose to use a 4052.

oh! for instance using a "not" gate transistor ?

still think i'd have to amp up the low guitar signal before running the signal through the CMOS...
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