Electronics > Projects, Designs, and Technical Stuff
Understanding this signal conditioning circuit
graybeard:
--- Quote from: Red_Micro on February 22, 2020, 02:55:44 am ---What's the purpose of C4? It is obviously reducing the original amplitude of the signal.
--- End quote ---
C4 is just a DC blocking capacitor. I creates input high pass roll-off corner at about 3.6 Hz. It should have no significant effect on the 60 Hz input signal.
It is shown as a polarized capacitor being used in a AC circuit. This is not good practice since it will see reverse bias.
By inspection:
C1 & C5 make the amplifiers act as ~670 Hz low pass filters. Becasue of the diodes C1 appears to only a low pass for negative inputs, it does nothing for postive inputs. Since the circuit is non-liner there may be subtle effects that a simulation would reval that a quick look does not.
D4 & D5 are input protection diodes
R5 || R6 || C3 create a single pole low pass at ~339 Hz
The final stage in absolute value circuit. The 500K resistors seeem a bit large to me.
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