guitar pickup pre-amplifier / phase flipper

[dataplex]

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.

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

 

[Inquisitive]

Please post picture to this website. So that it may be permanently attached to this thread. Posting to third party sites often get severed and the thread meaning becomes vague.

Thanks

 

[audioguru]

Why invert the signal from a guitar? People cannot hear actual phase. Also the frequency from the guitar will not have perfect sync with any other sound.

The 0.1uF capacitor in the negative feedback cuts all frequencies above 16Hz so the maximum gain at DC is 101, at 16Hz it is 71, at 32Hz it is 36, at 64Hz it is 18, at 128 it is 9 etc.

 

[dataplex]

i am flipping the phase to change the behaviour of an electromagnetic feedback circuit. i am cutting off everything above 16hz to avoid nasty buzzing/artifacts in the signal.

 

[audioguru]

Then you have a guitar pickup but no guitar and no music.

 

[dataplex]

ok - thanks!