Electronic Circuits by Tooley Mike

Author:Tooley, Mike
Language: eng
Format: epub
ISBN: 9781317572329
Publisher: Taylor and Francis
Published: 2015-05-21T16:00:00+00:00

Example 12.1

Design a timer circuit that will produce a 10 ms pulse when a negative-going trigger pulse is applied to it.

Solution

Using the circuit shown in Fig. 12.4, the value of monostable timing period can be calculated from the formula:

ton = 1.1 C R

We need to choose an appropriate value for C that is in the range stated earlier. Since we require a fairly modest time period we will choose a midrange value for C. This should help to ensure that the value of R is neither too small nor too large. A value of 100 nF should be appropriate and should also be easy to obtain. Making R the subject of the formula and substituting for C = 100 nF gives:

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