Thursday, May 29, 2014

Capacitance Meter Circuit Schematic Diagram using IC4093

Eltronicschool. - We know that in electronic usually capacitance difficulty to measure. We think we must use special measurement to measure how many the value of the capacitance of capacitors. Usually we use capacitance meter to measure the capacitance of capacitor easily. 

A Capacitance Meter can be an useful tool for the electronics amateur, mainly to measure the value of capacitors obtained after dismantling old radios, PC cards and other electronics appliances. Good quality capacitors can be found frequently, but often their capacitance value is unknown because the lettering on the case is hardly readable: in some cases being partially or completely erased.

In here we will give you simple Capacitance Meter Circuit Schematic Diagram using IC4093 that you can use to measure capacitance capacitor like in figure 1 below:

Circuit Schematic

Figure 1. Capacitance Meter Circuit Schematic Diagram (Source: circuitdiagram.org)

Component List
  1. P1_____________470R Linear Potentiometer
  2. R1 to R6________47K 1/2W Cermet or Carbon Trimmers
  3. R7______________10K 1/4W Resistor
  4. R8_____________100R 1/4W Resistor
  5. C1_______________1nF 63V Polyester or Polystyrene Capacitor 5% Tolerance or better
  6. C2______________10nF 63V Polyester or Polystyrene Capacitor 5% Tolerance or better
  7. C3_____________100nF 63V Polyester Capacitor 5% Tolerance or better
  8. C4_______________1µF 63V Polyester Capacitor 5% Tolerance or better
  9. C5______________10µF 25V Electrolytic Capacitor (See Notes)
  10. C6______________47µF 25V Electrolytic Capacitor
  11. IC1____________4093 Quad 2 input Schmitt NAND Gate IC
  12. IC2___________78L05 5V 100mA Regulator IC
  13. SW1____________2 poles 6 ways Rotary Switch
  14. SW2____________SPST Toggle or Slide Switch
  15. J1,J2__________1 or 2mm. chassis sockets (See Notes)
  16. J3,J4___________4mm Output sockets
  17. B1_______________9V PP3 Battery

Description

Circuit schematic like in figure 1 above is Capacitance Meter Circuit Schematic Diagram using IC4093. In conjunction with a voltmeter, this circuit gives a direct reading of capacitance. IC1A and IC1B form an oscillator and buffer, the frequency being set by R1 to R6 trimmers and C1 to C5 capacitors switched by SW1A and B in six different ranges. 

Output goes to IC1D, one of whose inputs is inverted and delayed by the unknown component by time proportional to its value. At the output of IC1D, normally high, a negative-going pulse with a width proportional to the capacitance appears, the duty cycle of the output and, therefore, the average voltage indicating the value of capacitance. 

Supply voltage stability is required for accuracy: therefore, a small 5V voltage regulator IC was added. (Source:circuitdiagram.org)


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