Electronics > Projects, Designs, and Technical Stuff
Circuit distorting AC signal from CT
Red_Micro:
Picture 1 shows a 60Hz signal from a CT only with the burden resistor connected. Picture 2 shows the signal when I connect it to the opamp circuit. Picture 3 shows the op amp circuit. Some points on it:
x1,x2 - z1-z2 are analog switches: SN74LVC2G66DCUR
L1 L2 are two identical secondaries (same turn ratio) from the same CT. One is used for primary sensing and the other is occasionally used for testing.
D12 sets the DC offset to Vcc/2
My guess is that the culprit here is related to the analog switch. Any light on this?
pardo-bsso:
What makes you think it's the analog switch?
Have you tried replacing it with jumpers?
coppice:
If you ran this without a burden resistor across L2, didn't it blow up the analogue switch Z1/Z2?
Red_Micro:
--- Quote from: coppice on August 27, 2020, 12:16:50 am ---If you ran this without a burden resistor across L2, didn't it blow up the analogue switch Z1/Z2?
--- End quote ---
But if there's a burden across L1, doesn't this load get reflected across L2?
wraper:
--- Quote from: pardo-bsso on August 27, 2020, 12:13:00 am ---What makes you think it's the analog switch?
--- End quote ---
How about what's written in datasheet?
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