|
Lamp Flasher - Simple photo-sensitive circuit 3V battery supply (added 9/04) |
|
LAN Switch in Ethernet Applications - Pericom Semiconductor Application Brief #
006 (app note added 2/05) |
|
Latching power switch uses momentary action pushbutton - 10/28/04 EDN-Design
Ideas: Most inexpensive pushbutton switches, particularly pc-board-mounting and
membrane types, have momentary action. Latching types are often larger and relatively
expensive, and they frequently are unavailable in the style you'd like to use. You can
thus have a problem if you need a small, inexpensive on/off switch for latching power
to a load.....(design idea added 11/04) |
|
Lattice Semi GDS Chip Programmer software - Generic Digital Switches are
in-circuit programmable devices made by Lattice Semiconductor that allow pin to pin
routing, buffering, and inversion. Perfect for making last minute circuit changes….
(added 11/05) |
|
LED Boost Switcher: Single AA Cell Powers Two LEDs at Constant Current -
(electronic design / schematic added 2/05) |
|
Light Control System - ….(circuit design added 08/08) |
|
Light Controlled Switch - output a control signal suitable for relay depending on
the light level (added 5/02) |
|
Light Detector Circuit (Mick Devine) - Variable resistor R1 adjusts the light
threshold at which the circuit triggers. R1's value is chosen to match the
photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as
the trigger, U1b and c form a latch. S1 resets the circuit. The output device may be a
low power piezo buzzer. (electronic schematic / circuit added 4/02) |
|
Light switch - ….(design added 08/08) |
|
Light/Dark Detector (Aaron Cake) - This handy little circuit can tell the
difference between darkness and light, making it very useful for switching on and off
signs, porch lights or other things when it gets dark or light. (circuit / schematic
design added 04/03/02) |
|
Lighting Third Brake Light - (Tony van Roon's electronic schematic / circuit added
4/02) |
|
Li-Ion Charge Termination IC Interfaces with PWM Switchers - DN242 Design
Notes (Linear Technology) (app note added 2/06) |
|
Live Insertion in High Speed Data Communications using 3.3V Bus Switches - Pericom
Semiconductor Application Brief # 031 (app note added 02/05) |
|
Load Sensing Automatic Switch - apply power to the entire audio system by turning
on1-item, simple circuit (circuit / design added 8/03) |
|
Logic offers complementary switch Control - 12/06/01 EDN-Design Ideas: The
complementary-switch controller in Figure 1 uses a few inverter gates to provide drive
signals for the complementary switches. Complementary-switch configurations find
widespread use in synchronous-rectification circuits, charge pumps, full-bridge
control circuits, and other circuits.....(design idea added 1/05) |
|
Low Power Keypad Consumes Only 100 Na - 01/24/02 EDN-Design Ideas:
Often in the use of products with keypads, one or more keys become "stuck" or are
being pressed. For example, a cell phone in the bottom of a purse or in a hip pocket
could have one or more of its keys inadvertently pressed and held.....(design idea
added 10/03) |
|
Low-cost ultra high isolation SPDT switch - Application Note MiniCircuits.com
(app note added 04/05/06) |
|
Macros for Page and Bank Switching - Microchip Application Note Published
26-Aug-97 (app note added 2/06) |
|
Measuring Jitter in Digital Systems AN 1448-1 - Agilent Application Note
(added 6/06) |
|
Memory Address Multiplexing using 3.3V Bus Switch - Pericom Semiconductor
Application Brief # 022 (app note added 02/05) |
|
Method provides automatic machine shutdown - 05/27/04 EDN-Design Ideas:
Some machines need to run for long periods and therefore may finish their work in the
middle of the night or during the weekend. For the time remaining, until the operator
returns, the machines stay idle, uselessly consuming.....(design idea added 1/05) |
|
Method to Reduce DC Power Consumption in CDMRF Power Amplifiers Through the LMV225 and
an Efficient Switcher - National Semiconductor Application Note (app note
added 6/06) |
|
MF2 Compatible Keyboard with COP8 Microcontrollers - National Semiconductor
Application Note (app note added 2/06) |
|
MicroController Multiplexes Dip Switches to I/O Port - 02/17/00 EDN-Design
Ideas:.....(design idea added 6/06) |
|
MIDI Controlled Switches - can drive up to128 individual relays, solenoids,
motors, etc. with a MIDI note-on and note-off messages (added 5/02) |
|
MIDI Controlled Switches - can drive up to128 individual relays, solenoids,
motors, etc. with a MIDI note-on and note-off messages (added 5/02) |
|
MIDI Controller Footpedal - (circuit / schematic added 6/05) |
|
MIDI keyboard - (circuit / schematic added 6/05) |
|
MIDI Switcher - (circuit / schematic added 6/05) |
|
Mixed Voltage Memory Module using PI5C16861 Bus Switch as a Translator - Pericom
Semiconductor Application Brief # 008 (app note added 02/05) |
|
MOSFET pair makes simple SPDT switch - 12/09/99 EDN-Design Ideas:.....(design idea
added 6/06) |
|
MOSFET Replaces Switch #1 - 01/20/94 EDN-Design Ideas: By using a cheap,
readily available MOSFET, you can use a single-pole switch to turn a bipolar power
supply on and off without consuming extra power. In Fig1, the switch simply controls
the MOSFET gate, which switches on the negative supply. Resistor R,.....(design idea
added 3/03) |
|
MOSFET Replaces Switch #2 - 02/03/94 EDN-Design Ideas: You can use a
single-pole switch to turn a bipolar power supply on and off without consuming extra
power.....(design idea added 3/03) |
|
MOSFET Switch provides efficient AC / DC conversion - 02/17/00 EDN-Design
Ideas:.....(design idea added 10/03) |
|
MOSFET Switch provides efficient AC/DC conversion - 02/17/00 EDN-Design
Ideas:.....(design idea added 10/03) |
|
Motor Reversing Circuit - (electronic design added 6/07) |
|
Motorcycle Brake Light Flasher - (Tony van Roon's schematic / circuit added 08/09) |
|
Motorcycle Low Voltage Warning - (Tony van Roon's circuit design added 08/09) |
|
Motorcycle Turn-signal System - (Tony van Roon's electronic circuit added 08/09) |
|
Multiple Remote Points Control on/Off Switch - 06/22/00 EDN-Design Ideas: /
Sometimes, you need to remotely turn on or off a two-state system, such as a light,
from multiple points. You could connect simple pushbutton switches in parallel to a
single-line bus. However, if the bus simply controls a toggle flip-flop, the system
must know its current state to positively ensure the new, desired.....(design idea
added 5/02) |
|
Multiple Switches with Single PIC Input - There are many techniques to implement
multiple switches into PIC microcontroller.This technique requires only one ADC pin to
detect voltage level when each switch for each state is pressed and each switch is
associated with a voltage. For example : If we need to connect 16 switches with 10 bit
PIC. ….(electronic schematic added 11/08) |
|
Multiplexing LED Drive and 4x4 Keypad Sampling - Microchip Application Note
Published 26-Aug-97 (app note added 2/06) |
|
NanoMount Switches for Microwave Applications - MicroNote 710 from Microsem
(app note added 6/06) |
|
Negative Voltage Load Switch - The good thing about this design is that i can make
use of the system i/o voltage to control the on/off and this is the whole idea.
However, there are many many type of load switches that turn of negative voltages….
(added 3.06) |
Negative Voltage Load Switch - The idea is simply to turn off the negative voltage
load. Some examples:-Bias votlages for LCD panels RF Amplifiers Audio
Amplifiers.
The good thing about this design is that i can make use of the system i/o voltage to
control the on/off and this is the whole idea. However, there are many many type of
load switches that turn of negative voltages. (added 11/05) |
|
New Switch Facilitates DisplayPort/PCIe Switching - Maxim App Note 4191 --
2/07/2008 -- (app note add 5/08) |
|
Night Light - (electronic design added 6/07) |
|
No Hassel Lighting Third Brake Light - (Tony van Roon's electronic schematic /
circuit added 4/02) |
|
On/off buffer switches analog or digital signals - 03/30/06 EDN-Design Ideas:
Use an op amp and a dual SPST to switch signals under digital control.....(design idea
added 05/06/07) |
|
ON/OFF with Microcontrollers - Here is a technique how to implement an ON/OFF
button using microcontrollers. (circuit added 11/06) |
|
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. ….(electronic schematic added 11/08) |
|
One Button On-Off Switch with 4093 and 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. ….(circuit design added 11/08) |
|
One oscillator drives multiple solid state relays - 03/16/06 EDN-Design Ideas:
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. (circuit.....(design idea added 6/07) |
|
On-Off Temperature Control Circuit - ….(circuit design added 08/08) |
|
Optical Toggle Switch using a Single Chip - (circuit / schematic design added
6/06) |
|
Optimizing Laptop Docking Station Designs using LAN Switches - Pericom
Semiconductor Application Brief # 041 (app note added 2/05) |
|
PC Power Switch - Simplest ever PC switching unit, turn on peripherals with the PC
(schematic added 6/07) |
|
PCMCIA Socket Voltage Switching Design Note 93 - DN93 Design Notes (Linear
Technology) (app note added 6/06) |
|
Perimeter Monitor - Using a single cable such as speaker wire or doorbell cable,
this circuit can be remotely positioned, for example, at the bottom of a garden or
garage, and used to detect all sound in that area. The cable can be buried in a
hosepipe or duct and is concealed out of sight. The mic is an ordinary dynamic mic....(added
4/02) |
|
Photovoltaic Switch disables unused LEDs - 03/18/04 EDN-Design Ideas: In
many applications, it's desirable to disable LEDs used for system verification. Many
options are available for the disabling function, including manual SPST (single-pole
single-throw)switches, enhancementand depletion-mode MOSFETs, bipolar-junction
transistors, and JFETs.....(design idea added 1/05) |
|
Piezoelectric Triggered Switch - Two different switch circuits are shown.
One sources current and the second sinks current. Both switches are connected to
a piezoelectric wafer. When the wafer is tapped, the switches are activated.
(added 7/06) ….(designed by David A. Johnson) |
|
Piezoelectric Vibration Sensor Activates Switch - An inexpensive piezoelectric
wafer is used to detect vibration and when the vibration is sufficient a switch is
activated. (added 7/06) ….(designed by David A. Johnson) |
|
Pine Racecar Victory Judge (Aaron Cake) - (circuit / schematic added 6/05) |
|
PINs and GaAs MESFET Switches-Effects On Linearity - MicroNote 703 from Microsem
(app note added 6/06) |
|
Polarity Reversal Switch - Switch the absolute polarity (180° phase shift) of
signals with this simple circuit (schematic added 6/07) |
|
Pop Free Microphone ON/OFF Switch Circuit - This circuit uses a simple technique
to eliminate the usual “pop” sound when an electret type microphone is switched on or
off. The circuit is completely passive and will work on dynamic and
electret type microphones. ….(designed by David A. Johnson) |
|
Porch light slave switch - This circuit turns on the porch light when a passive IR
security light is activated. Designed by Andrew R. Morris (added 09/05) |
|
Porch Light Switch - (electronic design added 6/07) |
|
Power-Off Time Delay Relay - The two circuits above illustrate opening a relay
contact a short time after the ignition or light switch is turned off. The capacitor
is charged and the relay is closed when the voltage at the diode anode rises to +12
volts. The circuit on the left is a common collector or emitter follower and has the
advantage of one less part since a resistor is not needed in series with the
transistor base. However the voltage across the relay coil will be two diode drops
less than the supply voltage, or about 11 volts for a 12.5 volt input. The common
emitter configuration on the right offers the... |
|
Printer Port Activates CMOS Switches - 05/02/02 EDN-Design Ideas: The
cost-effective design in Figure 1 provides control for CMOS switches without the need
for an external power supply. Analog switches such as those in the MAX4663 are ideal
for use in low-distortion applications. They are preferable to electromechanical
relays in.....(design idea added 1/05) |
|
Printer Sharing Switch - I had two computers, a Mac Mini and a generic Windows
computer. Both were on different networks, but in the same room, and I wanted to share
a Lexmark USB laser printer between the two of them. I ended up making this switch to
share the printer between the two computers....(schematic / circuit added 6/07) |
|
Protection Schemes for BI-FET Amplifiers and Switches - National Semiconductor
Application Note (app note added 2/06) |
|
Push Button Motor Control - (electronic design added 6/07) |
|
Push Button Switch Debouncer - (circuit / schematic added 6/05) |
|
Pushbutton Activated Service Request Beeper - A single press of a pushbutton
switch turns on a beeper for one second but can’t be activated again for 60 seconds.
(added 7/06) ….(designed by David A. Johnson) |
|
Pushbutton Switch Controls Power Supply and µC - 09/25/97 EDN-Design Ideas:
Switching handheld units on and off with a pushbutton switch is a desirable feature.
Thus, switching-regulator/ controller ICs for battery-powered applications provide a
logic input to switch the device to a shutdown mode. This type of shutdown pin can
require additional components.....(design idea added 6/06) |
|
Pushbutton Switch Debouncer - (electronic schematic / circuit added 4/02) |
|
Pushbuttons and digital potentiometer control boost converter - 02/17/05 EDN-Design
Ideas: Digitally controlled potentiometers are useful for generating analog
control voltages under the control of a microcontroller. In some applications, manual
pushbutton switches could replace a microcontroller and simplify product design.
Mechanical switches exhibit contact bounce, and, when a user actuates them, they may
open and close many times before reaching a stable state.....(design idea added 11/05) |
|
Quickly discharge Power supply capacitors - 07/05/01 EDN-Design Ideas:
A perennial challenge in power-supply design is the safe and speedy discharge, or
"dump," at turn-off of the large amount of energy stored in the postrectification
filter capacitors. This energy, CV 2 /2, can usually reach tens of joules. If you let
the capacitors self-discharge, dangerous voltages.....(design idea added 1/05) |
