# Symmetrical signal with operational amplifier

I hope you can help me. I have a project with operational amplifiers. In this project I need to create a mirror signal (symmetrical signal) from this output:

To something like this:

The two requirements are:

• Only use operational amplifiers, resistances and capacitors
• The circuit must have two inputs, a square signal and a triangular signal

I've tried with many settings, but I have not succeeded.

I created this circuit with the original output, but I don't know how can I get the mirror of a symmetrical signal:

If someone can help me I will appreciate it.

• Are you looking for en.wikipedia.org/wiki/Operational_amplifier#Inverting_amplifier to do the "mirroring"? Commented Jul 13, 2021 at 4:33
• The simplest way is the standard inverting amplifier with G=-1… just use equal feedback resistors. By the way 20nF on the feedback of your first amp are a lot, do you need some heavy filtering? Commented Jul 13, 2021 at 6:13
• For first signal, just add the 2 generators ... For the second, just substract. Amplitude of square bigger than triangle. Use a more clear schematic. It help. :) Some resistance are "too lower". Use 10k, for example. Under 15 V there is a current of 1.5 mA max. If using 500 Ohm, it can be ...30 mA ! On board, add always decoupling capacitors nearest opamp. Commented Jul 13, 2021 at 8:07
• Thanks to everyone. I could solve the problem this is the solutions. Thanks @FlorianRagwitz, LorenzoMarcantonio and Antonio51 Commented Jul 13, 2021 at 18:17
• @bisonte Would you like to post an answer to your own question to help out other people with a similar problem searching the site in the future? Commented Jul 13, 2021 at 19:24