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ON OFF Touch Switch
with 555 - This ON OFF touch switch
circuit is based on the well known timer IC 555 (IC1), which drives a relay that acts like a switch. The metal
surfaces can have what form we want, but it should be clean and very close to the circuit. . . . [Circuit posted
by Popescu Marian]
On/off buffer switches analog or digital signals - 03/30/06 EDN Design Idea Use an op amp and a dual SPST to switch
signals under digital control. . . [by Liviu Pascu, Kepco, Flushing, NY]
On/Off Latch Circuit - Often you want to turn on and off power to a device with a single
pushbutton switch. The circuit below performs this logic function with just a few parts and can operate from DC
supplies between +3v to about 15v. It uses two inverters within a 74C14 or a CD4069 hex inverter package. Each
press of the button toggles between the two on/off logic states. . . . [Circuit by David Johnson P.E.,
01/09/10]
On/Off Power Switch - NOTE: Must register on this site. . . [Published in Elecktor July/Aug,
2010]
On/off Pushbutton Switch with
30 Minute Timeout - I received an
email from a Discover Circuits visitor. He wanted to control power to a LED camping light he was building. He
wanted to turn the light on and off with a small pushbutton switch. He also wanted a timer so the light would not
stay on longer than 30 minutes at a time. It seems that his kids often turned lights on when going to bed and
then forgot to turn them off . . . [Circuit by Dave Johnson P.E., 01/08/12]
On/Off Switch With
Latching Relay - The circuit below
switches AC or DC power to a load using an ultra low power 3v latching relay with two coils. The relay can handle
about 10 amps of current, up to 250vac. Each time the small pushbutton is pressed, the circuit either latches the
relay . . . [Circuit by David A. Johnson P.E., 12/24/09]
ON/OFF with MicroControllers - Here is a technique how to implement an ON/OFF button using
microcontrollers. . . . [Jose Pino]
One Button Digital On-Off
Switch - The load is driven by the
MOSFET IRFZ44 and 4093 AND gates are used in the circuit. The output of the 4093 IC drives the MOSFET. Only one
button allows you to change the on-off state of the electronic circuits in which you use this switch. The circuit
schematics is above. Click image to see the larger schematics diagram. . . .
One Button On-Off Switch with
4093 & IRFZ44 - The load is driven by
the MOSFET IRFZ44 and 4093 AND gates are used in the circuit. The output of the 4093 IC drives the MOSFET. Only
one button allows you to change the on-off state of the electronic circuits in which you use this switch. The
circuit schematics is above. Click image to see the larger schematics diagram. . . .
One oscillator drives multiple solid-state relays - 03/16/06 EDN Design Idea A conventional electromechanical relay often
makes sense for switching large amounts of load current on and off and when proportional control of the load’s
current or voltage is unnecessary. . . [by Juan Ramón Vadillo Pastor, SOR Internacional SA, Saint Quirze Del
Valles, Barcelona, Spain]
One processor pin controls on/off function - 04/29/04 EDN Design Idea A recent Design Idea prompted me to offer
the simpler solution that I used in a recent project (Reference 1]. We needed a momentary power switch with
processor supervision. This supervision would allow the processor to delay a power. . . [by Michael Sirkis,
Radio Systems, Logan Township, NJ]
One switch controls digital potentiometer - 09/19/02 EDN Design Idea This Design Idea is an evolution and
simplification of another (Figure 1, Reference 1]. Replacing the three inverted-input NOR gates with their
logical equivalents, positive-input NAND gates, makes these three gate symbols consistent. . . [by im Bach,
Delphi Delco Electronics Systems, Kokomo, IN]
One
switch selects one of three signals -
03/02/06 EDN Design Idea Total cost is less than $1 - Low-cost, easy-to-use design allows monitoring of
peripherals, sensors. . . [by Felix Matro, JL Audio Corp, Phoenix, AZ]
One switch serves dual duty in small, microprocessor-based system - 03/30/06 EDN Design Idea Low-cost, easy-to-use design allows
monitoring of peripherals, sensors. . . [by Steve Hageman, Windsor, CA]
One-IC-based electronic circuit replaces mechanical switch - 03/15/07 EDN Design Idea Flip-flops debounce pushbutton switch - sample
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. . . [by Santosh Bhandarkar, Bangalore,
India]
One-Watt White LED
Night Light - This simple circuit
is designed to plug into a standard AC electrical outlet. It uses four super bright white light emitting diodes
(LED) in conjunction with a capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are
angled slightly . . . [Hobby Circuit designed by David A. Johnson P.E., 11/06/08]
One-wire keypad interface frees microcontroller-I/O pins - 03/31/05 EDN Design Idea Using this interface topology, you can reduce
the number of keypad interface wires to just one and thus save critical microcontroller I/O ports. . . [by
Israel Schleicher, Prescott Valley AZ]
Optical Filter using
Color Film Negative - This isn’t an
electronic circuit but the file shows the curve for an optical filter made from exposed color film. The material
blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool
white" fluorescent light for about 5 seconds . . . [Hobby Circuit designed by David A. Johnson P.E., 01/01/98]
Optical Remote
on/off Switch - Using this optical
remote control, you can switch on/off any electrical or electronic load. Like any remote control system, it has a
mini transmitter unit and a receiver unit to activate the relay. . . . [© EFY Enterprises Pvt. Ltd. All rights
reserved]
Optical Toggle
Switch using a Single Chip - . . .
Optimizing Laptop Docking Station
Designs using LAN Switches -
Application Brief # 041. . . [Pericom Semiconductor]
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