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HEWLETT-PACKARD
JOURNAL
T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S
Vol. 14, No. 12
PUBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA AUGUST, 1963
A Wide-Range RC Oscillator
with Push-Button Frequency Selection
IN BOTH laboratory and production work lator tuning system to have high resetability
it is common to encounter measuring situa and simplified frequency selection is to design
tions in which it is necessary to make tests at one in which the desired frequencies are se
a relatively few test frequencies, but in which lected by push-button switches. Such a system
these same few frequencies are used again and gives quick selection of frequency, eliminates
again. When the need for operator dexterity in setting a
sec ALSO
this is the case, tuning dial, and all but eliminates the effect
An Oscillator for
Telephone Tests, p. 6 it is advanta of mechanical tolerances which degrade the
A O.I Nanosecond Pulser, p. 7
At Wescon, p. 8
geous if the resetability of the usual variable tuning sys
test oscillator tem. Consequently, the repeatability of a push
being used has not only a convenient means button system can be essentially that estab
for selecting the desired spot frequencies but lished by the short- and long-term stability of
also a high resetability of output frequency. the oscillator circuit, while the readability,
A logical approach in designing an oscil being that of a digital system, is high and at
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