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# A capacitance meter.

Extracts from this document...

Introduction

THE CAPACITANCE METER

The block diagram shows the basic arrangement for the design of a capacitance meter.    Range resistor   ## Astable                 Monostable               Display         Multivibrator             Multivibrator           Cx Unknown capacitance

Middle

=11544

## (8) ## Monostable multivibrator often called a one shot

Conclusion

Output To calculate Rs I will use OHMS law.

Rs=V/I

Rs=9/0.0125

Rs=720Ω

(13) The zener fails to regulate when the current through it drops to 0. the current through Rs will then be 2.5mA.

a)VRs=2.5mA*Rs

VRs=2.5mA*720Ω

VRs=1800

b) The minimum voltage the battery can drop to and still provide 5V across the capacitance meter circuit is 5V.

c) Rs=VRS/2.5mA

Rs=1800/2.5

Rs=720

(14) This is the pin out diagram for the TO92 type regulator.                (15)                 R=V/I

R=2/0.005

R=400Ω

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