|
Behavior of CMOS in hot insertion - Pericom Semiconductor Application Brief # 039
(app note added 02/05) |
|
Big Endian to Little Endian Data Conversion using 3.3V Bus Switches - Pericom
Semiconductor Application Brief # 034 (app note added 02/05) |
|
Bipolar Transistor Boosts Switcher's Current by 12 times - 05/24/01 EDN-Design
Ideas: (design idea added 8/03) |
|
Bistable Switch - This circuit shows how to implement a simple bistable (On/Off)
switch. You can also do this with a Schmitt trigger gate or inverter. Just set R1 and
R2 to bias input to center point of Schmitt trigger’s hysteresis.
Designed by Andrew R. Morris (added 6/06) |
|
Block power switching module - (circuit added 06/07/08) |
|
Boole helps simplify Wiring and save money - 07/08/04 EDN-Design Ideas: To
safely observe positions of two cylinders, you need two signals: one circuit, X,
which is open only when both cylinders are in a safe position (two normally closed
switches in parallel)….....(design idea added 1/05) |
|
Buffer switches analog or digital signals on/off - 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) |
|
Build a negative Voltage power side switch - 10/14/04 EDN-Design Ideas: When
you need to quickly connect a negative power supply under logic control, the negative
power-side switch in Figure 1 can help. Although originally intended for driving the
gates of high-current MOSFETs, the MIC4451 can assume a different role. It provides
complementary, low-on-resistance MOSFET switches to connect a system power-supply rail
to a negative input voltage or to ground, enable.....(design idea added
05/05//05) |
|
Build a simple one chip phototimer - 07/08/04 EDN-Design Ideas: Recently, I
needed to automatically switch on a lamp when it became dark and keep it on for a
given time. Trying not to reinvent the wheel, I looked through what was available on
the market, but I could not find an inexpensive device that satisfied the requirement.
Some products worked like a photoswitch, lighting a lamp when it becomes dark and
keeping it on while it is dark—in other wor.....(design idea added 11/05) |
|
Build a Simple Soft Action Muting Switch - 10/14/04 EDN-Design Ideas: The
circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a
line-level audio circuit. R4, C1, and JFET Q1 quietly ground a signal in 100 to 200
msec when you close S1 or release it when you open S1. Potentiometer R2, set to twice
Q1's cutoff voltage, makes on/off transition.....(design idea added 5/05) |
|
Bus Load Isolation using a High Density 3.3V Bus Switch - Pericom Semiconductor
Application Brief # 033 (app note added 02/05) |
|
Bus Switch Applications For Laptop Computers; Memory Modules; A/D Video; Etc -
Pericom Semiconductor Application Brief # 013 (app note added 2/05) |
|
Bus Switch for Memory Switching: PI5C16292 - Pericom Semiconductor Application
Brief # 018 (app note added 02/05) |
|
Bus Switch in PCI Hot Plug Applications - Pericom Semiconductor Application Brief
# 019 (app note added 02/05) |
|
Camera Switcher - This circuit can be used for multiple cameras with one monitor.
The circuit can be operated manually or automatically. (added 10/05) |
|
Capacitive Sensor - Special design for shop-windows animation. Useful for
many types of touch controls. (electronic circuit added 06/07/08) |
|
Capacitive touch switch uses CPLD - 05/29/08 EDN-Design Ideas: Using an
Altera MAX IIZ CPLD, you can implement a touch-switch decoder with no external
components.....(design idea added 06/07/08) |
|
Capacitor Discharge Power Supplies For Twin Coil Switch Machines - The schematics
on this page have sections that have heavier lines. These lines represent the portions
of the circuit that are subjected to large current surges when the switch machines are
operated. Careful attention to good wiring and soldering techniques should be used for
these sections to ensure good results....(circuit added 08/08/08) |
|
Car Alarm and Immobilizer - This circuit features exit and entry delays, an
instant alarm zone, an intermittent siren output and automatic reset. By adding
external relays you can immobilize vehicle and flash lights.....
(added 6/06) |
|
Cell-Phone-Controlled Audio/Video Mute Switch - (circuit / schematic design added
6/06) |
|
Channel Switching using Σ-Δ ADCs - AN-665 Analog Devices Application Notes
(app note added 6/06) This application note refers to AD7708 and AD7718.
Data sheets specify update rate for Σ-Δ ADCs. |
|
Charge Coupled MOSFET Relay #2 - This circuit acts as an AC/DC relay with a rating
up to 50 volts peak and up to 10 amps of current. The differential oscillator
supplies voltage to the gates of the two FETs with good isolation will drawing only
1.5ma of current. ….(designed by David A. Johnson) |
|
Cheap Pushbutton Replaces Rotary Switch - 10/26/00 EDN-Design Ideas: / The
problem of setting any one of four modes of a µC-operated process has a
straightforward solution: Have the µC check the states of some 4 bits of a µC register
or an input port and then execute one of the four predetermined subroutines according
to the result. The next question is how the operator sets these 4 bits or,
specifically, selects a desirable mode of operation.....(design idea added 05/02) |
|
Cheap pushbutton replaces rotary switch - 10/26/00 EDN-Design Ideas: The
problem of setting any one of four modes of aµC-operated process has a straightforward
solution: Have theµC check the states of some 4 bits of aµC....(design idea added
08/08/08) |
|
Circuit efficiently Switches Bipolar LED - 11/22/01 EDN-Design Ideas: The
circuit in Figure 1 represents one method to switch a bipolar, two-color LED using an
SPDT mechanical switch or relay. This circuit wastes power and does not work properly
if the power-supply voltage is not substantially more than the sum of the LEDs'
forward voltages. The circuit is, therefore, marginal, to the point of being unusable,
with a 5V supply and a red or green LED, which.....(design idea added 1/05) |
|
Circuit forms DC Motor Switch with Brake - 01/10/02 EDN-Design Ideas:
controlling a small dc motor without speed control sounds like a trivial task; a
switch or a relay should suffice. However, several problems accompany this approach.
For one, the switch, because of the inductive load and the low starting resistance of
the motor, tends to wear out prematurely (with all the related sparks and EMI
problems).....(design idea added 1/05) |
|
Circuit Protects from Battery Polarity Reversal - This simple circuit can protect
a sensitive electronic circuit from an accidental connection of a battery with a
reversed polarity. The N-channel FET connects the electronic device to the
battery only when the polarity is correct. The circuit shown was designed for a
device powered from a single 1.5 volts button cell battery. However, the circuit
will operate with higher voltages as well. ….(designed by David A. Johnson) |
|
Circuit removes relay contact Bounce - 11/27/03 EDN-Design Ideas: Advances
in semiconductor technology have allowed ICs to replace many mechanical relays, but
relays still dominate in high-current circuits that must stand off high voltages of
arbitrary polarity. Contact bounce in those relays, however, can prove troublesome to
downstream circuitry. One approach to contact bounce combines a relay with a hot-swap
controller.....(design idea added 1/05) |
|
Circuit Simulates Contact Bounce - 05/08/97 EDN-Design Ideas: (design idea
added 2/06) |
|
Clap Activated Remote - (circuit / schematic design added 6/06) |
|
Clap Relay - Clap sensitive on-off Relay. 3V Battery operated, small
portable unit, (added 03/05) |
|
Clap Switch - Circuit / schematic (added 02/05) |
|
Clean Switcher Powers 16 Bit A/D Converters - 07/04/94 EDN-Design Ideas: The
low-noise switcher in Fig 1 works much like a TV's horizontal-deflection circuit to
provide clean power for a 16-bit A/D converter. In operation, Q3 is a logic-level
gate-drive MOSFET driven by the same 100-kHz square wave that clocks the A/D
converter. When Q3 turns off, the primary of T1 resonates with C3 and flies back to
25V. Energy.....(design idea added 6/06) |
|
Clock Design using the PIC16c54 for LED Displays and Switch Inputs - Microchip
Application Note Published 26-Aug-97 (app note added 6/06) |
|
Clock Fail Circuit Switches to Alternate Clock - 10/24/96 EDN-Design Ideas:
(design idea added 6/06) |
|
Clock Switching Circuit Banishes Glitches - 12/19/96 EDN-Design Ideas:
(design idea added 6/06) |
|
CMOS Switches vs. PIN Diode and GaAs Switches - Application Note California
Eastern Laboratories Doc #959 (app note added 6/06) |
|
Cold Activated Switch - The thermistor used has a resistance of 15k at 25 degrees
and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin
catalogue. The 100k pot allows this circuit to trigger over a wide range of
temperatures. A slight amount of hysteresis is provided by inclusion of the 270k
resistor. This prevents relay chatter when temperature is near the switching threshold
of this circuit. (added 2/06) |
|
Cold Activated Switch zen22142 - A simple thermistor triggered cold switch with
adjustable threshold. (added 10/05) |
|
Combination Lock - (electronic schematic / circuit added 4/02) |
|
Combinational Conjuring Trick - The simple circuit of Fig.1 emulates a similar
conjuring trick which sells for hundreds of Pounds. The trick seems to do the
almost-impossible from an electronic point of view, let alone from the point of view
of common sense. It consists of a bank of three on-off switches (S19-S21), which
have three switch covers, each of a different colour. These switch a bank of three
lightbulbs(electronic schematic / circuit added 4/02) |
|
Connect a 2x16 characters LCD display to a 4x4 keypad - Connect some 2x16
characters LCD display and 4x4 keypad with AVR microcontroller (electronic
design added 03/04/05) |
|
Contact debouncing algorithm emulates Schmitt trigger - 07/07/05 EDN-Design Ideas:
Another approach to solving the ubiquitous contact debounce problem.....(design idea
added 11/05) |
|
control room light intensity - 11/11/04 EDN-Design Ideas: Many people favor
different light and temperature settings for different rooms depending upon their mood
or whether they are working or relaxing. The circuit in Figure 1 controls the
intensity of the artificial light in a room and monitors the temperature of two zones.
The two main circuit blocks are the PIC16C67 master controller and the ADT7516
temperature-sensor interface, which includes a.....(design idea added 11/04) |
|
Controlling a Light with Two Switches - a light or lights can be controlled by
more than1-switch (added 2/03) |
|
Counter with Doorbell - (electronic design added 6/07) |
|
CPLD automatically powers itself off - 04/13/06 EDN-Design Ideas: Add a few
discrete components to a CPLD to implement a battery-powered system's power-down
circuit.....(design idea added 11/06) |
|
CPLD autonomously powers battery powered system - 04/12/07 EDN-Design Ideas:
(design idea added 4/07) |
|
Current limit switch is digitally programmable - 08/17/00 EDN-Design Ideas:
(design idea added 11/05) |
|
Current Limit Switch is Digitally Programmable - Maxim Application Notes / 298 /
Dec-04 (app note added 5/08) |
|
Dark Activated 12v Power Supply Switch - Using an inexpensive phototransistor,
this circuit switches 12v to 24v power to a load, whenever the sun goes down. (added
7/06) ….(designed by David A. Johnson) |
Dark Activated Switch (Andy Collinson) - This circuit will activate a relay when
light falls to a preset level. Light level can be adjusted with VR1 and the relay
contacts may be used to operate an external light or buzzer.
….(schematic added 03/04/05) |
|
Dark-activated 230V Lamp - Compact circuitry using small-size parts only.
Can be wired in parallel to existing switches. (added 3/05) |
|
Dark-activated LED or Lamp Flasher - This circuit adopts the rather unusual
Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about
1Hz and is set by C1 value…..(electronic design added 6/07) |
|
DC Motor Control using a Single Switch - (circuit / schematic design added 6/06) |
|
DC Motor Reversing Circuit - A DC motor reversing circuit using non latching push
button switches. Relays control forward, stop and reverse action, and the motor cannot
be switched from forward to reverse unless the stop switch is pressed first…..(circuit
/ schematic added 6/05) |
|
DC Motor Reversing Circuit zen22142 - A DC motor reversing circuit using non
latching push button switches. Relays control forward, stop and reverse action, and
the motor cannot be switched from forward to reverse unless the stop switch is pressed
first. (circuit / design added 8/03) |
|
DC Push Button Motor Control Circuit - (circuit / design added 8/03) |
|
Debouncing Networks Make Reliable Selector - 06/05/97 EDN-Design Ideas:
(design idea added 3/03) |
|
Delayed Off Light Switch - This is an unusual design in that it uses plain metal
gate CMOS logic instead of the usual PIC or a custom chip. The 22uF capacitor charges
up during one half of the ac cycle, and supplies trigger current to the triac on both
halves. (added 2/05) |
|
Demonstrating the *set_report* Request: With PS/2® to USB Keyboard Translator Example
- Microchip Application Note Published 4-May-04 (app note added 2/06) |
|
Designing High-Speed Digital Systems for Logic Analyzer Probing - Agilent
Application Note (added 6/06) |
|
Designing USB 2.0 Interface using PI3USB20 Switch - Pericom Semiconductor
Application Note # 067 (app note added 2/05) |
|
Digital Combination Lock - (electronic schematic / circuit added 4/02) |
|
Digital Switching System - (electronic Circuit / Schematic added 10/04) |
|
Digital Timer Light Switch - Typical circuit representative of those used in most
light switch type digital timers. The timer module is normally a PIC or custom chip,
and it syncs to the AC line so that a trigger pulse can be supplied at the right
moment. (added 2/05) |
|
Digital VGA Switch - Digital VGA switch for switching between two PC monitors with
MAX465 IC. ….(electronic schematic added 11/08) |
|
Digitally control room light intensity - 11/11/04 EDN-Design Ideas: Many
people favor different light and temperature settings for different rooms depending
upon their mood or whether they are working or relaxing. The circuit in Figure 1
controls the intensity of the artificial light in a room and monitors the temperature
of two zones. The two main circuit blocks are the PIC16C67 master controller and the
ADT7516 temperature-sensor interface, which includes a.....(design idea added 11/04) |
|
Diode Matrix Systems for Stall Motor Switch Machines - (circuit / schematic design
added 6/06) |
| DIY remote control based on PIC - Control up to 8
devices by this easy constructable remote control. It can work as a radio or infrared
remote control, depending on the components. Each device output can be configured to
be momentary (turned on while you press the button) or latched. Latched outputs can be
toggled on/off by one button per channel, or turned on and off by two buttons per
channel….(circuit / design added 8/03) |
|
DMX PC keyboard interface - (electronic circuit added 4/05) |
|
Dog Whistle - It's well known that many animals are particularly sensitive to
high-frequency sounds that humans can't hear. Many commercial pest repellers based on
this principle are available, most of them operating in the range of 30 to 50 kHz.
From what I've read, dogs and other mammals of similar size behave much differently
than insects. They tend to respond best to frequencies between .... (added 11/05) |
|
Doorbell Indicator-Remote - (electronic design added 6/07) |
|
Doorbell with Counter - (electronic schematic / circuit added 4/02) |
|
Dual White LED Driver Features Integrated Switches and Schottky Diodes in 3mm × 3mm
Dfn Package - DN1010 Design Notes (Linear Technology) (app note added
6/06) |
|
Dual-Display with LED Driver with 3/2x Switched Capacitor Boost - National
Semiconductor Application Note LM2796 February 2004 (app note added 2/05) |
|
Eight Switcher Powers High Performance µPs - 04/13/95 EDN-Design Ideas: The
circuit in Fig 1 delivers 8A for driving as many as two of today's high-performance,
high-speed µPs. You can also optimize the design for lower current by changing a few
components. Most systems use a low-current 12V bias supply and a poorly regulated
high-current 5V to power the logic.....(design idea added 6/06) |
|
Electronic circuit replaces mechanical push push switch - 09/28/06 EDN-Design
Ideas: Toggle-action circuit uses a low-cost momentary-contact
switch.....(design idea added 9/08) |
|
Electronic Night Light - (circuit / design added 8/03) |
|
Electronic potentiometer system has pushbutton interface - 09/26/02 EDN-Design
Ideas: As systems grow smaller, it becomes increasingly
attractive to replace mechanical potentiometers with electronic potentiometers, which
are smaller and less expensive silicon equivalents. A common interface for such
devices comprises a Chip-Select, Increment and, Up/ line. CS activates the device and,
on a rising edge of steps the wiper in a direction that the U/ pin
indicates.....(design idea added 10/03) |
|
Electronic Toggle Switch No.1 - This simple circuit will energize and de-energize
a relay at the push of a button. Pushing the button once, will energize the relay. And
pushing it a second time, will de-energize the relay. The accompanying Circuit
Description offers a good introduction to the workings of the Cmos 4013.
(circuit design add 02/09) |
|
Electronic Toggle Switch No.2 - This simple circuit will energize and de-energize
a relay at the push of a button. Pushing the button once, will energize the relay. And
pushing it a second time, will de-energize the relay. The accompanying Circuit
Description offers a good introduction to the workings of the Cmos 4013.
(circuit design add 02/09) |
|
Enhanced 4-Digit Alarm Control Keypad - This Keypad is suitable for the Modular
Burglar Alarm. However, it has other applications. Pressing a single key will energize
the relay. Entering the Four-Digit code of your choice will de-energize it….(circuit
design added 08/08/08) |
|
Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital Potentiometer
- AN-712 Analog Devices Application Notes (app note added 6/06) |
|
Excessive Current Consumption Reduction for Switches with Undershoot - Pericom
Semiconductor Application Brief # 043 (app note added 02/05) |
|
External components provide true shutdown for boost converter - 03/16/06 EDN-Design
Ideas: An additional MOSFET and resistor solves the problem by opening the
unwanted current path during shutdown.....(design idea added 05/06/07) |
|
Fail-Safe Monitoring and Clock Frequency Switching using the PIC16f684 - Microchip
Application Note Published 16-Dec-03 (app note added 6/06) |
|
Fault Latch Circuit Protects Switchers - 02/19/04 EDN-Design Ideas: Many
power-supply designers like to have a regulator latch off in the event of an
overcurrent situation or other fault condition. Yet, many PWM controllers do not
internally support this latch-off function. Most do, however, have a power-good output
and an enable function. The circuit in Figure 1 adds that latch-off capability at low
cost in little additional space.....(design idea added 1/05) |
|
Finger Touch Activated Switch - It does not get any easier if you want a solid
state switch that is activated by the touch of a finger. Two small metal pins route
voltage through the finger skin to a MOSFET switch. The circuit is great for
situations where a membrane type mechanical switch is not desired. ….(designed by
David A. Johnson) |
|
Four Digit Keypad - (electronic design added 9/02) |
|
Frequency Switch - (electronic circuit added 4/05) |
|
Fridge door Alarm - Beeps if you leave open the door over 20 seconds. 3V
battery operation, simple circuitry. (circuit added 9/04) |
|
Frost Alarm (Andy Collinson) - The thermistor used has a resistance of 15k at 25
degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the
Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of
temperatures. A slight amount of hysteresis is provided by inclusion of the 270k
resistor. This prevents relay chatter when temperature is near the switching threshold
of this circuit. (added 2/06) |
|
Fundamentals of Sampled Data Systems - AN-282-Analog Device Application Notes
(app note added 2/06) |
|
Garden Light Switch - (circuit / design added 8/03) |
|
High Current MOSFET Flip Flop with Debounced Pushbutton - This circuit was
adapted from the "Toggle Switch Debounced Pushbutton" by John Lundgren. It is
particularly useful in controlling a load from several locations where the load may be
switched on from one location and switched off from another. Any number of momentary
(N/O) switches or push buttons may be connected in parallel. The circuit....(circuit /
schematic design added 6/06) |
|
High Efficiency Linear and Switching Solutions for Splitting a Digital Supply -
DN172 Design Notes (Linear Technology) (app note added 6/06) |
|
HIGH or LOW Power Switch For Lights or Small Motors - (schematic / circuit added
05/06/07) |
|
High side Current sensing switched mode regulator provides constant Current LED drive
- 04/14/05 EDN-Design Ideas: Drive LEDs with constant-current source.....(design
idea added 6/06) |
|
Hold Function for Telephone - ASCII format (circuit / schematic design added 6/06) |
|
Hot-Plug and Hot-Swap Bus Switches - Pericom Semiconductor Application Note # 052
(app note added 02/05) |
|
HT0640 for Electronic Line Switch - Supertex Semiconductors (app note added
2/06) |
|
HT18 and HT19 for Electronic Line Switch - Supertex Semiconductors (app note
added 2/06) |
|
Impact of Undershoot on Bus Switches and Corresponding Solutions in PCI Hot-Plug
Applications - Pericom Semiconductor Application Brief # 029 (app note added
02/05) |
|
Implementing Wake Up on Keystroke - Microchip Application Note Published 26-Aug-97
(app note added 2/06) |
|
Implementing Wake-Up on Keystroke - Microchip Application Note Published 26-Aug-97
(app note added 2/06) |
|
Improving the Accuracy of Optical Transceiver Extinction Ratio Measurements - AN
1550-9 - Agilent Application Note (added 6/06) |
|
Infra Red Switch (Andy Collinson) - This is a single channel (on / off) universal
switch that may be used with any Infra Red remote control using 36-38kHz. (This is a
very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be
used. (electronic circuit added 7/03) |
|
Infra Red Switch (Andy Collinson) - This is a single channel (on / off) universal
switch that may be used with any Infra Red remote control using 36-38kHz. (This is a
very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be
used. (electronic circuit added 7/03) |
|
Infrared Safety Switch - Using a slotted optical sensor, this circuit can be used
as a replacement for a large mushroom pushbutton safety switch. ….(designed by David
A. Johnson) |
|
Infrared Transmitter and Receiver Schematic Diagrams - (circuit / design added
8/03) |
|
Inline equations offer hysteresis Switch in PSPICE - 08/16/01 EDN-Design Ideas:
Smooth-transition switches are convenient devices in many Spice-based simulators.
Their action can greatly ease the convergence process. Unfortunately, these devices
lack inherent hysteresis, a helpful feature used to build UVLO (undervoltage-lockout)systems,
oscillators, and other systems. Intusoft's.....(design idea added 1/05) |
|
Interrupt Driven Keyboard for MCS 51 uses Few Components - 05/26/05 EDN-Design
Ideas: Interface keypad easily to a microcontroller I/O port. (added 10/05) |
|
Introduction, definition of terms, Q&As-sw13-2 - Application Note MiniCircuits.com
(app note added 04/05/06) |
|
IR Remote Switch - (electronic Circuit / Schematic added 10/04) |
|
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) |
|
Journal of Internet Test Methodologies - Agilent Application Note (app note
added 6/06) |
|
Key reading circuit saves I/O pins - 02/06/03 EDN-Design Ideas: Some
microcontroller applications usually use too many I/O pins to read keys or onboard
switches; in many cases, few pins remain available for other uses. Some alternative
ways to read keys yield more free pins. First, consider some ways to effect
key.....(design idea added 8/03) |
|
Keyboard Video Mouse KVM - Intersil Application Block Diagram (app note
added 6/06) |
|
KeyLock - Press four keys in specific order, and relay will turn on for about to 5
seconds and that is it. But first you must memorize your code following this way:
press and hold button (button on pin 3), so long until Led goes ON. Now, when
….(circuit design added 08/08) |
|
Keypad Controlled Switch No. 2 - This is a simplified version of the 4-Digit
Keypad Controlled 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 design added 08/08/08) |
|
Keypad Encoder ComMands Tape Transport - 09/02/96 EDN-Design Ideas: (design
idea added 3/03) |
