Diagram WKQ muc pins, JDQ water level detection and relay, figure 1 would like to ask what is the use of the two diodes is stem what of, thank you

CodePudding user response:

The diode is used for clamping

CodePudding user response:

Circuit, R6 and R7 partial pressure of D1 and D2 are used to clamp, the R5 front end voltage U (namely WKQ) control between 0 to 5 v. When U is a negative pressure, D2 conduction, U is 0, when U is a positive pressure, 0 5 v, D1 conduction, U=5 v, R5 and C4 is equivalent to the RC filter circuit, the circuit is actually a voltage detecting circuit with protection,

CodePudding user response:

refer to the second floor weixin_44062350 response:

, R6 and R7 bleeder circuit, D1 and D2 is used for clamping the R5 front end voltage U (namely WKQ) control between 0 to 5 v. When U is a negative pressure, D2 conduction, U is 0, when U is a positive pressure, 0 5 v, D1 conduction, U=5 v, R5 and C4 is equivalent to the RC filter circuit, the circuit is actually a voltage detecting circuit with protection,

Thank you, little white circuit thank you very much,