DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
Frequency Comparator Draws 8 µA - 03/03/97 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title"
EDN for new link.
Frequency comparator has status output - 26-Dec-02 Issue of EDN
The original application for the circuit in Figure 1 was to check the number
of revolutions of an engine with only one LED as an indicator. The
measurement of the number of revolutions usually involves sensors with a
frequency output proportional to the number of revolutions. The circuit
compares the frequency output of such a sensor with a lower and upper limit
and gives a visual result, usi.... [Design Idea by Susanne Nell, Breitenfurt,
Austria]
Frequency comparer produces binary results - 09/29/94 EDN-Design
Ideas....Instead of resorting to full-blown frequency counters, the simple
circuit in Fig 1 uses four ICs to rapidly compare the frequency of two pulse
trains. The circuit produces a binary 0 if f1 is greater than f2 and a
binary 1 if f1 is less than f2. The circuit exploits the fact that
inevitably two consecutive leading edges of the higher frequency pulse train
will follow each.... EDN is migrating links. This link is not verified.
Google the "title" EDN for new link.
Frequency Window Comparator has hysteresis - 11/07/96 EDN-Design
Ideas....The frequency comparator in Figure 1 uses two VCOs. C1, R1+R2, and the
voltage at pin 9 determine the frequency of IC1 (900 Hz]. C3, R5+R6, and the
voltage at pin 9 determine the frequency of IC2 (1580 Hz]. If fIN is lower than
900 Hz, then the output P2 of phase-comparator 2 in IC1 is high and drives....
[Design Idea by W Dijkstra, Consultant, Waalre, The Netherlands]
Make a simple PC-based frequency meter. - 04/29/99 Issue of EDN A
simple, low cost, and precision frequency meter uses only two pins of a pc
parallel port (Figure 1]. The TTL-level periodic input signal with frequency fIN
connects to the ACK pin of LPT1. This input produces an IRQ7
hardware....Page includes several designs. Scroll to find this one....
[Design Idea by Radovan Stojanovic, University of Patras, Patras, Greece]
