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| LM741 connections with signal generator |
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| iMo:
The Gain of your opamp is set to A = 1 + R2/R1 = 1+ 10k/2k = 6 With 9Vpp (??) input signal from your generator you overdrive the opapm. With +/-9V batteries the max opamp's output you may get could be 14Vpp (+/-7V) max for example. With A = 6 the max opmap input (your generator output) could be max 2.2Vpp (peak to peak) therefore. Also mind your generator's DC level must be 0V (your input signal must be centered around 0V) otherwise 2.2Vpp will not fit into 14Vpp output range. Better set the generator's output to 500mVpp at the beginning and watch the output. Also the generator shall be connected between + input and GND (GND is the middle of the +/-9V batteries). PS: in case it is your first experiment with 741 always use some protection resistors (1k-10k in series with input and output) at the opamp's input and output, or use coupling capacitors (as in my schematics above) in order not to smoke your 741. |
| Gazmon:
Ok I will adjust my connections And again apologies for the lack of info above at first Will post my results , Thanks again everyone |
| iMo:
For example: R3 and R4 are protection resistors (1k-10k). The input is 5kHz square, -0.5V to +0.5V, 1Vpp. Output is 6Vpp (-3V to +3V). PS: the second picture is 3kHz 2.2Vpp sine (-1.1V to +1.1V) input. The 3rd picture is the same 2.2Vpp sine signal but DC shifted to +0.5V (centered around +0.5V). You may see the output does not fit into the opamp's output range anymore (with +/-9V batteries). The output is clipped at +8V (the max swing). |
| Gazmon:
Ok I will add a 1k- 10k to the output connection in series then and at the input |
| iMo:
I've updated above the examples and pictures - with that settings you have to see the same on your o'scope screen.. |
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