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Linear Capacitive Proximity Sensor

  • Rajkumar Sharma
  • 36 Views
  • moderate
  • Tested
  • SKU: EL144713
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The project presented here is an analog capacitive proximity sensor. The circuit is from Texas Instruments application note. Most conventional capacitive proximity sensors produce a “1” or “0” output, this circuit produces a DC output that is a function of the size and relative permittivity of an object passing between the sense capacitor plates. Different sized and density objects will produce a different output voltage. The oscillator input for this circuit is a 50Khz sine source. The low frequency and sine characteristics keep RFI problems at a minimum. This proximity detector may prove difficult to construct because of the small capacitances involved, parasitic capacitances in the sensor circuit, and noise pickup. The circuit requires an external 50Khz sinewave with 1Vpp Signal. The circuit operates with a dual 15V DC supply.

Features

  • Power Supply +/-15V (Dual 15V DC)
  • Header Connector for Sensor Inputs and Outputs
  • On Board Power LED
  • PCB Dimensions 60.17 x 16.19 mm

Connections

  • CN1: Pin 1 = +V 15V DC, Pin 2 = Frequency Input 50Khz Sine Wave 1V Peak to Peak, Pin 3 GND, Pin 4 = GND, Pin 5 = Sensor, Pin 6 = -V 15V
  • CN2: Pin 1 = +V 15V DC, Pin 2 = GND, Pin 3 = -V 15V, Pin 4 = GND, Pin 5 = Output
  • D3 Power LED

Schematic

 

Parts List

NO.QNTY.REFDESCMANUFACTURERSUPPLIERSUPPLIER PART NO
11CN16 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5319-ND
21CN25 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5318-ND
31C1680PF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
41C2220PF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
51C32.2nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
61C44.7nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
71C53PF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
810C6,C7,C8,C9,C10,C12,C13,C14,C15,C16100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
92C11,C1710uF/25V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
102D1,D21N4148 SMDMICROCHIPMOUSER494-1N4148UR-1
111D3RED LED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
121R18.66K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R278.7K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
141R39.76K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
151R4100K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
161R510M 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
171R61K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
184R7,R8,R10,R1110K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
191R95K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
205U1,U2,U3,U4,U5 OPA132 SOIC8TIMOUSER595-OPA132UA/2K5

Connections

Application Data

Gerber View

Photos

Video

OPA132 Datasheet

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