+5 volts to +/- 5volts

AuDioMiRage · Joined: Jan 14, 2015 Posts: 9 Location: Wisconsin

Hello,
I've been trying to find an easy way to convert a 0 to +5 volt output signal from a CMOS gate to a signal that goes between +5 volt ( Logic 1 ) and -5 volt ( Logic 0 ). I have searched for a simple answer, to no avail. CMOS Cookbook (page 45) suggest using a CD4007 and a 10K resistor to -5 volts.
This uses the "P" channel on the CD4007, and there are only three.
I am looking to convert 8 signals, CD4007 solution would require 3 gates.
Pretty sure that somewhere on these pages I have seen a schemo that accomplished this same task using 2n3904's or something similar.
Short of it, can anyone point me in the direction of solving this?

Rolling Eyes

Thanks

piedwagtail · Posted: Sun Oct 11, 2015 8:28 am Post subject:

Possible avenue to follow, research, breadboard, report:

Rail to rail opamp (quad x2 = 8 ) set up as a comparator to fire on positive edge >1.5V with 5/-5 power supply.

http://www.electronics-tutorials.ws/opamp/op-amp-comparator.html

http://www.analog.com/media/en/technical-documentation/application-notes/AN-849.pdf

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For added fun, a dpdt switch can invert the response of the comparator.
A pot instead of the resistor divider will vary the firing point.
It can work with any varying signal ie.LFOs.

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R