Monday 6 March 2017

resistors - What did I do wrong? Inverting amplifier 1:1 ratio



schematic Board


I'm getting a non inverted output. The resistors I used were two 100ohm 1/4watts. Signal was 4v peak to peak 600hz.



Answer



Quad op-amps require pin 4 and pin 11 connected to Vsupply+ and Vsupply- for them to work. For your circuit to work (inverting Vcc to -Vcc) you need a negative supply on pin 11 that is greater in magnitude than Vcc for this to work.


Once you have this right you need to choose resistor values that are higher than 100 ohms because 100 ohms will take 50 mA from the op-amp output if Vcc is 5 volts.


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