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Here's another newly-uploaded Circuit Design Idea designed to give circuit building inspiration (click on the circuit diagram to expand it).It covers developing a voltage proportional to the value of a capacitive sensor and transmitting these readings via a LVDS interface.
The Design Idea begins:
In some applications of capacitive sensors, the instrument's front end must be small enough to fit into a narrow space. Figure 1 shows a precision capacitive-sensor interface for such use. The square-wave output from a low-voltage 555 timer, IC1, constantly triggers the precision one-shot, IC2, to produce quasistable outputs for time periods T1 and T2, which are proportional to external timing capacitance: T1=KR0(CS+C0), and T2=KR0CS, where K is the multiplier factor.Read the full Circuit Design Idea
It is courtesy of Jiaqi Shen and Xiaoshu Cai, University of Shanghai for Science and Technology, Shanghai, China.
View all the Design Ideas on Electronics Weekly
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