Page 23 Switch Electronic Circuits

Switch Circuits
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Last Updated: November 30, 2017 01:36 PM

Circuits Designed by Dave Johnson, P.E. :

Simple Circuit for 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 . . . [Circuit by David A. Johnson P.E., 07/27/03]
Single Output 120VAC 200 Watt Touch Switch - This simple circuit uses a single IC to form an Ice touch switch circuit. A single transistor forms the remote active switch sensor. Multiple switches can be wired in parallel. The switch circuit can be located about 500 feet from the control circuit. . . . [Hobby Circuit designed by David Johnson P.E., 02/07/10]

Sink to Source Universal DC Converter - As illustrated below, many control systems use an open collector transistor to turn something on. Perhaps it is a LED light, a relay or a small motor. However there are othersystems which require a common ground connection instead of a common V+ supply connection . . . [Circuit by Dave Johnson P.E., 03/27/11]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Got Designs?
Please eMail if you want me to link to and/or post your original design. Thanks.

Signal Detecting Auto Power on Unit - For equipment to be turned on with the main amp. Detects signal and applies power. . .

Signal-Powered Switch Connects Devices - 05/10/12 EDN Design Idea Use a switch to selectively connect a terminal, personal computer, or any other originating device to one of four receivers. . . [by James Dean, National Research Council, Ottawa, ON, Canada]

Simple Circuit for 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 . . . [Circuit by David A. Johnson P.E., 07/27/03]

Simple Continuity Tester Fits Into Shirt Pocket - 10-Jan-08 EDN Design Idea A pocket-sized continuity tester responds quickly to shorts or opens and is protected against connection to a live circuit. . . [by Tom Wason, Phoenixville, PA]

Simple keypad operated switch - I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of situations where it will still be adequate. . . . [Circuit designed by Ron J]

Simple Method to Reduce DC Power Consumption in CDMRF Power Amplifiers Through the LMV225 & an Efficient Switcher - Application Note. . . [National Semiconductor]

Simple optical switch - . . . [by IQ Technologies Industry, unless otherwise noted online]

Simple Toggle Circuits Illustrate Low Power-MOSFET Leakage - 08/07/08 EDN Design Idea A novelty circuit demonstrates the low leakage of modern power MOSFETs. . . [by Tom Bruhns, Mukilteo, WA]

Simple Touch Switch - Similar to the CMOS based Touch Switch also on this site, this transistor based touch switch can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only a few commonly available transistors and a 12V supply, it is ideal for hostile environments where mechanical switches would be damaged. Using a latching relay and two of these circuits, a simple two pad "touch on/touch off" arrangement can be made.. . . [by Aaron Cake]

Simulate Contact Bounce - 05/08/97 EDN Design Idea The circuit in Figure 1a simulates contact bounce of electromechanically and mechanically actuated electrical contacts. The circuit generates contact-bounce pulses for contact closing and opening. You can easily program the. . . [by John Guy, Maxim Integrated Products, Sunnyvale, CA]

Single Control Switch for Fan and AC - Here is an electronic switch that can be used to switch on both the air-conditioner as well as fan of your room, one by one. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved]

Single Output 120VAC 200 Watt Touch Switch - This simple circuit uses a single IC to form an Ice touch switch circuit. A single transistor forms the remote active switch sensor. Multiple switches can be wired in parallel. The switch circuit can be located about 500 feet from the control circuit. . . . [Hobby Circuit designed by David Johnson P.E., 02/07/10]

Single 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]

Single 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]

Single 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]

Single 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]

Single-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]

Single-switch controls digital potentiometer - 02/07/02 EDN Design Idea The control of electronic potentiometers in most today's applications comes from controller-generated signals. However, a significant number of applications exist that require adjustments using manual, front-panel controls. The circuit. . . [by Chuck Wojslaw and Gary M Craig, Catalyst Semiconductor, Sunnyvale, CA]

Single-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]

Sink to Source Universal DC Converter - As illustrated below, many control systems use an open collector transistor to turn something on. Perhaps it is a LED light, a relay or a small motor. However there are othersystems which require a common ground connection instead of a common V+ supply connection . . . [Circuit by Dave Johnson P.E., 03/27/11]

Six-way Switch - The 40106 is a versatile CMOS IC containing six Schmitt trigger inverters. It can be used to implement a set of alternating-action switches with hardware contact bounce suppressionmust register on this site. . . [Published in Elecktor July/Aug, 2010]

Slave Switcher - There are many situations where two or more pieces of equipment are used together and to avoid having to switch each item on separately or risk the possibility of leaving one of them on when switching the rest off, a slave switch is often used. . . .

Sleep Switch Cum Wake Timer - This circuit can be used either as a sleep switch or as a wake timer. It provides a dual display for showing units and tens places of time in minutes or seconds format. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved]

Sleep Switch Cum Wake up Timer - . . .

Sleeping Aid - Based on electromagnetic-field radiation; Place it under the pillow - Built-in timer. . . [Flavio Dellepiane's web site]

Slot Termination Components for Pentium II & Xeon Processor-Based Multiprocessor Systems - Application Brief # 026. . . [Pericom Semiconductor]

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