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Control
Circuits Page 4c
Control Circuits:
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Last Updated on:
Thursday, November 30, 2017 01:24 PM |
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Circuits Designed
by Dave Johnson, P.E. : |
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Isolated Remote Switch Circuit
There are many applications when a remote switch’s on/off status needs to be
monitored. Reed relay sensors, toggle control switches and security alarms
contacts are just a few examples. Routing a switch directly to a computer
system hundreds of feet away can often lead to erratic operation and noise
problems. If such a control switch is required, a fully isolated circuit
is strongly recommended. The circuit below provides such isolation.
When properly wired, it will have 5000 volts of isolation and can be positioned
1000 feet away....
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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[ad-DAJ-FS-split.htm] |
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Inverted bipolar transistor doubles as a signal Clamp -
06/07/01 EDN-Design Ideas A number of circuits, such as level
detectors and AM demodulators, benefit from a rectifier with a low
offset voltage. Silicon diodes have an offset of approximately 0.6V
and do not work well in low-level circuitry. A Schottky diode is a bit
better.... [Design Idea by Art Hogrefe, Puma Instrumentation, State
College, PA] |
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IR Extender Mk 5 - The latest addition to my collection of
Infra Red (IR) Repeater circuits. The Mark 5 is a much improved
version of the Mark 1 circuit and has increased range and sensitivity.
It is also immune to the effects ofambient light, daylight and other
forms of interference. In addition it works with IR modulation
freuencies in the range 30 to 120kHz making the Mk5 circuit the best
choice for compatibility with remote controls....(schematic added
01/2010) |
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IR Proximity Sensor - It is the same principle in ALL
Infra-Red proximity sensors. The basic idea is to send infra red light
through IR-LEDs, which is then reflected by any object in front of the
sensor. Then all you have ….(electronic schematic added 11/08)
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IR Remote Control - Volume and mute are provided by this simple but
functional circuit. Suitable for all preamps. (schematic added 6/07)
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IR remote control - I have received a number of emails requesting
schematics for infa-red remotes. So here is one. This remote transmits a
tone using an infa-red LED. This tone is decoded by the receiver. Since
the receiver only switches when it "hears" the tone, there are no accidental
activations. [Aaron Cake's design] |
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IR Remote Control Extender - This circuit is used to relay signals
from an Infra Red remote control in one room to an IR controlled appliance in
another room [Andy Collison's design] |
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IR Remote Control Extender Circuit - sorry, site is under
construction, check back] |
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IR Remote Control Extender Circuit Mark 2 - (electronic circuit
added 4/05) |
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IR Remote Control Extender Circuit Mark 3 - (electronic circuit
added 4/05) |
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IR Remote Control Jammer (Aaron Cake) - Don't like your little
brother's TV channel selection? Hate the volume your wife sets the stereo at?
Want to just annoy someone? This circuit does all that and more by jamming
most IR remote signals. The circuit releases a flood of pulsing IR light that
confuses the receiver by corrupting the data stream....(added 4/02)
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IR Remote Control Tester - A simple IR receiver to facilitate in
testing of Infra Red Remote Control handsets…. [Circuit design by Andy
Collison] |
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IR Remote Switch - (circuit / schematic design added 6/06)
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IR Remote Volume Controller - ….(Circuit design added 08/08) [Site
is under construction right now] |
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Isolated Driver Forms Solid-state Circuit Breaker - 03/02/98
EDN-Design IdeasThis circuit allows standard TTL logic levels to safely drive
a high-power dc load, circuit provides also overcurrent circuit breaker
functionality.…File contains many circuits, please scroll to find this one....
[Design Idea by Bob Watson, Corley Manufacturing Co, Chattanooga, TN] |
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Isolated Remote Switch Circuit - There are many applications when a
remote switch’s on/off status needs to be monitored. Reed relay sensors,
toggle control switches and security alarms contacts are just a few examples.
Routing a switch directly to a computer system hundreds of feet away can often
lead to erratic operation and noise problems. If such a control switch
is required, a fully isolated circuit is strongly recommended. The
circuit below provides such isolation. When properly wired, it will have
5000 volts of isolation and can be positioned 1000 feet away.... [Designed by
David A. Johnson] |
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Control Circuits:
#-B
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T
U-V
W-Z |
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