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Last Updated:
Tuesday, May 01, 2012 07:11 AM
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Featured Circuit of the Week |
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Crystal Controlled 1KHz Signal
Generator
A while back I got
an email from a Discover Circuits visitor. He needed a way to calibrate a
RPM display for a big diesel engine. The engine had a tachometer output
which produced 12 pulses per rotation with an amplitude of about 5v RMS. The
full scale reading on the engine’s RPM speed display dial was 5,000. This
translates to a pulse frequency of 1KHz at full scale. To calibrate the
display, he needed an accurate 1KHz signal. The 32KHz crystal controlled
oscillator below performs this function. It uses a CD4060 binary counter,
which has internal inverters configured for a classic crystal oscillator.
The Q5 output divides the 32KHz crystal frequency by 32 yielding an output of
1KHz. The output is AC coupled to the input of the tachometer. |
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Hot
Links to Check Out! |
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Faraday Switches
are tiny one inch cube
electronic modules using a capacitance change technique. They draw very
low current and are ideal for battery powered applications.
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Hobby Corner has hobby circuits --
check it out. |
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Circuit
Solutions Dave Johnson shares solutions to
tricky electronic design problems. |
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Dave's
Circuits Special section with
circuits designed by David A. Johnson, P.E. |
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Call Dave
for your next consulting project |
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David A. Johnson, P.E. is an
electronics engineer with over 30 years practical experience in
the areas of analog & digital design, fiber optics and RFID. Electronics is his
vocation, hobby and passion. He is a published author with articles and designs in
EDN, Electric Design, Midnight Engineering and Popular Electronics. Throughout
his career, Dave's imaginative approach to design has resulted in applying new
technologies in creative and cost saving ways. October 23, 2003
Remembering Bob the Beagle
Beagle Photo Album |
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Dave's other websites to visit:
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collection of resources
for inventors, hobbyists,
scientists & engineers |
resource portal for information
regarding renewable, alternative
or sustainable energy |
Dave Johnson & Associates -
consulting services for new products from conception
to production or improving the
cost & performance of existing products |
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