Simulation made with Multisim. http://i.imgur.com/3Gsij5Z.png
As soon as I close the switch (simulation of an input signal) the circuit begins to oscillate at a very high frequenzy (705 khz), when i open the switch afterwards the circuit continues to oscillate. I also made a prototype of this circuit turns out the simulation was correct. I read that IC Amplifiers start to oscillate when theres is a phaseshift of 180° (my load are just 2 optocouplers?!).
Any ideas why it oscillates?
Data sheets: http://goo.gl/cbwYl1
https://goo.gl/QCDzeD
The whole circuit: http://i.imgur.com/K4tY2ae.png (the first picture just shows the part that oscillates)
As soon as I close the switch (simulation of an input signal) the circuit begins to oscillate at a very high frequenzy (705 khz), when i open the switch afterwards the circuit continues to oscillate. I also made a prototype of this circuit turns out the simulation was correct. I read that IC Amplifiers start to oscillate when theres is a phaseshift of 180° (my load are just 2 optocouplers?!).
Any ideas why it oscillates?
Data sheets: http://goo.gl/cbwYl1
https://goo.gl/QCDzeD
The whole circuit: http://i.imgur.com/K4tY2ae.png (the first picture just shows the part that oscillates)