Hi Everyone,
This is my first project I've built the circuit and it's not working as I expected and have reached the point where I need some help.
Long story short, I am trying to build a circuit that will take a signal (hopefully either square or sine) with zero crossing of +/-6V and invert it (gain of -1). This is for an automotive application where my input is coming from a speed converter box that adjusts frequency and does level shifting to a zero crossing signal of a factory square wave signal.
I bought some components in and tried them out:
LT1057CN8 Op-Amp (+/-10V~18V) : http://www.analog.com/media/en/technical-documentation/data-sheets/10578fd.pdf
RD-0512D DC-DC Converter (+5V to +/-12V) https://www.recom-power.com/pdf/Econoline/RD.pdf
USB Phone charger to supply +5V to the DC-DC Converter.
two 1k Ohm resistors
setup and circuit looked like this:
First time I tried this it looked like no inversion happened but the output signal changed to an odd shaped square wave with about +1V and -3V instead of the +/-5V input. The negative side of the square wave developed an upward slope as well. This probably OK as the ECU I am trying to supply should only care about zero crossings but I was expecting an inversion...
The first time I checked my DC-DC output it showed +2V and -22V output. I did some more troubheshooting, tried switching + and - on the op amp etc. and seemed to make things worse. Now my DC-DC converter seems to just be putting out +24V. and 0V on the V- pin.
Does this circuit look OK to you?
Am I missing some components?
Does this sound like my DC-DC or other converter has been damaged?
Any help (in layman's terms!) would be greatly appreciated!
This is my first project I've built the circuit and it's not working as I expected and have reached the point where I need some help.
Long story short, I am trying to build a circuit that will take a signal (hopefully either square or sine) with zero crossing of +/-6V and invert it (gain of -1). This is for an automotive application where my input is coming from a speed converter box that adjusts frequency and does level shifting to a zero crossing signal of a factory square wave signal.
I bought some components in and tried them out:
LT1057CN8 Op-Amp (+/-10V~18V) : http://www.analog.com/media/en/technical-documentation/data-sheets/10578fd.pdf
RD-0512D DC-DC Converter (+5V to +/-12V) https://www.recom-power.com/pdf/Econoline/RD.pdf
USB Phone charger to supply +5V to the DC-DC Converter.
two 1k Ohm resistors
setup and circuit looked like this:
First time I tried this it looked like no inversion happened but the output signal changed to an odd shaped square wave with about +1V and -3V instead of the +/-5V input. The negative side of the square wave developed an upward slope as well. This probably OK as the ECU I am trying to supply should only care about zero crossings but I was expecting an inversion...
The first time I checked my DC-DC output it showed +2V and -22V output. I did some more troubheshooting, tried switching + and - on the op amp etc. and seemed to make things worse. Now my DC-DC converter seems to just be putting out +24V. and 0V on the V- pin.
Does this circuit look OK to you?
Am I missing some components?
Does this sound like my DC-DC or other converter has been damaged?
Any help (in layman's terms!) would be greatly appreciated!