October 2013
Intermediate to advanced
312 pages
12h 10m
English
Content preview from The Maplin Electronic Circuits Handbook, 2nd Edition
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166 TIMERS
+
5
V
Input
from TTL
(logic 1 to enable)
Figure 7.18 Simple gated audible
tone generator
0 V
+
5
V
Figure 7.19 Pulsed alarm tone
generator
Precision timers
Unfortunately, when timing periods in excess of a few tens of seconds are
required, the humble 555 timer is somewhat limited in accuracy. This
limitation is directly attributable to the poor tolerance and excessive
leakage currents associated with large value electrolytic capacitors.
An obvious solution to the problem is that of using a short period time
standard (one that can be generated with a high degree of accuracy) and
dividing this using a chain of binary dividers to produc ...
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