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Bistable Multivibrator or Flip/Flop
Circuits - Page 4
Bistable (Flip-Flop): #'s-D
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Last Updated on:
Friday, March 23, 2012 04:35 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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TIME TO DUST INDICATOR
I thought about this circuit when I heard that a lot cleaning personal in hotels
were either dusting rooms more often than necessary or not enough. I have not yet
built and tested this circuit completely but in concept it should work. The circuit
draws very low current from a +3v battery and could be housed in a package similar
to a small ashtray. The assembly might be placed in a suitable out of the way area
to collect dust. It would alert a maid when it was time to dust the room. The
circuit detects dust with an infrared LED that is pulsed so its light shines onto a
smooth flat plate. Any dust settling onto the surface is detected by a
phototransistor, mounted at a 90-degree angle from the LED. When the dust reaches a
particular level, sufficient light is reflected into the phototransistor to change
the logic state of the circuit to an alarm condition. The alarm output could be
connected to a beeper, a flashing LED or to one of the LED flashing circuits in this
hobby circuit section.
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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SCR Flipflop for Alternating Flashing Light Bulbs - Schematic
only, no circuit description |
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Set/Reset Flip Flop - This is an example of a set/reset flip
flop using discrete components. When power is applied, only one of the
transistors will conduct causing the other to remain off. The conducting
transistor can be turned off .... |
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Single-IC-based electronic circuit replaces mechanical switch -
03/15/07 EDN-Design Ideas mple and inexpensive electronic circuit
uses a low-cost pushbutton switch to toggle the electrical power on and
off. The circuit replaces a more costly and bulky push-push mechanical
switch. The pushbutton switch triggers a monoshot circuit. The monoshot
circuit’s.... [Design Idea by Santosh Bhandarkar, Bangalore, India] |
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Soft On/Off Switch - Modern electronic equipment incorporate
"push-to-on-push-to-off" switches that do not make noise as with old
equipment. An example of this is the power button on a ATX computer
cabinet. Here is a circuit that does the same. It can be used to turn
on/off.... (added 7/02) |
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Sound Controlled Flip Flop - Described here is a very inexpensive solution to
many phono-controlled applications like remote switching on, for instance, or activating a
camera, tape recorder, burglar alarms, toys, etc. The circuit given here employs a
condenser microphone as the pick-up. A two-stage amplifier built around a quad op-amp IC
LM324 offers a good gain to enable sound pick-up upto four metres. …. (added 10/05)
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Spare flip-flop stretches WR strobe for DSP - 07/20/95 EDN-Design Ideas A
74LS592 programmable counter (not available in high-speed F or ACT versions) is a
convenient IC to use in DSP applications, such as in an ADSP-2101 design running at 10
MHz. However, a close inspection of the counter's worst-case timing specifications and the
WR strobe width reveals that the 74LS592 fails.... [Design Idea by Dhananjay Gadre, IUCAA
Instrumentation Lab, Pune, India] |
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Spare gates form edge triggered flip-flop - 03/16/95 EDN-Design Ideas
[Design Idea added 2/06] EDN migrating links. This link is not verified. Search the
"title" EDN for new link. |
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Telephone Line Based Audio Muting & Light on Circuit - FAIR WARNING -THIS SITE
HAS ANNOYING POP UP ADS. (added 4/02) |
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Telephone Line Based Audio Muting & Light-On Circuit - (electronic Circuit /
Schematic added 10/04) |
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Time to Dust Indicator - I thought about this circuit when I heard that a lot
cleaning personal in hotels were either dusting rooms more often than necessary or not
enough. I have not yet built and tested this circuit completely but in concept it should
work. The circuit draws very low current from a +3v battery and could be housed in a
package similar to a small ashtray. The assembly might be placed in a suitable out of the
way area to collect dust. It would alert a maid when it was time to dust the room. The
circuit detects dust with an infrared LED that is pulsed so its…. [Designed by David A.
Johnson] |
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Verilog Program Models metastable flip-flop - 05/12/94 EDN-Design Ideas
The Verilog HDL program in Listing 1allows you to simulate the behavior of a set-reset
(SR] flip-flop that has both its set and reset inputs high simultaneously. The outputs of
a physical SR flip-flop become indeterminate in this condition. This property is the
basis of circuits such as random-number and pseudo-noise-sequence (PSN] generators.….
[Design Idea by Swapnajit Mittra, Wipro Infotech Ltd, Bangalore, Karnataka, India] |
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Bistable (Flip-Flop):
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