|
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µC implements Pushbutton Light Dimmers - 06/18/98 EDN-Design
Ideas....A project required building a synchronous-demodulator circuit to
track a line drawn on paper. beauty of
synchronous-modulator/demodulator approach is its inherent noise rejection.
method rejects ….File contains several circuits, scroll to find this one....
[Design Idea by William Grill, Riverhead Systems, Littleton, CO] |
|
µC Provides Wireless Keypad Control - 10/08/98 EDN-Design
Ideas....Portable systems, such as telephone handsets, make extensive use of
low-dropout (LDO]regulators. se components provide noise-sensitive parts
with a stable power-supply line....Scroll to find this specific article....
[Design Idea by Lloyd Khuc, Motorola Inc, Austin, TX] |
|
1 oscillator drives multiple solid-state relays - 16-Mar-06 Issue
of EDN 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.... [Design Idea by
Juan Ramón Vadillo Pastor, SOR Internacional SA, Saint Quirze Del Valles,
Barcelona, Spain] |
|
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1.5v Touch Activated Switch - A single 1.5v silver oxide button cell powers
this complete touch activated switch circuit for 5 years. It features both a
normally open and a normally closed set of solid state switch thermals. It also
has an adjustable sensitivity, which can be set for a touch capacitance change as
small as 1 picofarad. …. [Designed by David A. Johnson] |
|
10 Reasons to Upgrade to a 16800 or 16900 Series Logic Analyzer -
....application note is....internal Xilinx and....packet level to....buses ...4
3....integrity by quickly....Trace Core) core....Interface, POS PHY....Agilent
Application Note 2007-12-03....[App Note] |
|
100 Seconds Duration On Switch with Touch Control - This is a touch control
switch which keeps the circuit on about 100 seconds after touching the plate connected
to the 2 numbered pin. At the end of this time duration, relay releases and the
circuit gets to off position. The impedance of the trigger input of the 555 timer IC
is very high and the inductive voltage on the human body is enough to trigger it. The
circuit works based on this principle. You can use a piece of metal as a plate. The
circuit can be used in toy circuits, buzzers or any project that is suitable. You can
adjust the duration time by changing the R1 and C1 values. ….... |
|
120VAC Touch Switch - This is a capacitance based touch on/touch off switch,
which can control power to a 200 watt 120vac load. (added 12/04) …. [Designed by
David A. Johnson] |
|
12v Light/Dark Lamp Switch - At night, this circuit will route current to a
12v lamp, turning it on. (added 7/06) …. [Designed by David A. Johnson] |
|
12v Light/Dark Switch - Often, for certain low voltage lighting systems; you
would like to turn off the lights during the bright light of the day. Most
commercial day/night switches are designed for AC lighting. The circuit below
was designed for a 12v DC system. But, it could be modified for other voltage as
well. It uses an inexpensive phototransistor as the light detector. An
n-channel FET is used to switch power to the lights. A transistor circuit is
included to provide some hysteresis. This keeps the circuit from fluttering the light
during the transition from day to night and night to day. It is recommended that
a plastic tube be placed over the transistor to prevent it from being illuminated by
the lights it is controlling. By selecting the appropriate power FET, the
circuit could control over 100 watts worth of 12v lighting. (July 27, 2008) ….
[Designed by David A. Johnson] |
2 Way IR Term - This unit provide 2 way IR communications using a numeric
keypad and an LCD display. Data is sent and recieved in ASCII with no regard to
what the data means to any particular device.
….... [Luhan Monat - Mesa Arizona] |
|
2 wire 4 by 4 key keyboard interface saves power - 08/17/06 EDN-Design
Ideas....Resistor matrix and microcontroller encode keypad.... EDN is migrating links.
This link is not verified. Google the "title" EDN for new link. |
|
20 Watt Simple Switcher Forward Converter - National Semiconductor
Application Note 01 May1998 (app note added 6/06) |
|
240VAC Touch Switch - This is another capacitance based touch on/touch off
switch, which can control power to a 200 watt 240vac load. (added 12/04) ….
[Designed by David A. Johnson] |
|
250kHz 1mA I Q Constant Frequency Switcher Tames Portable Systems Power -
DN108 Design Notes (Linear Technology) (app note added 1/06) |
|
27MHz AM/CW Transmitter - Electroinic design circuit…. [from Harry Lythall's
website] |
|
3.3V Bus Switches for PC100/PC133 DIMM Switching - Pericom Semiconductor
Application Brief # 032....[App Note] |
|
4 Digit Keypad - (electronic design added 9/02) |
|
49MHz Walkie-Talkie - Lots of people are requesting walkie-talkie and RF
remote control schematics, so here is some. Building se circuits needs special
equipment and expertise in RF circuits. If you are going to experiment with se
circuits, please note that I did not build.... [Peter Jakab, Electrical Engineer,
Engineer of Informatics] |
|
5 Volt Momentary Operation Touch Switch - This simple circuit uses a single
IC to form a nice 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.... [Designed by
David A. Johnson] |
|
555 Timer MonoStable Circuit using Pushbutton - The two circuits above
illustrate using the 555 timer to close a relay for a predetermined amount of time by
pressing a momentary N/O push button. The circuit on the left can be used for long
time periods where the push button can be pressed and released before the end of the
timing period. For shorter periods, a capacitor can be used to isolate the switch....
[Bill Bowden's website] |
|
556 Timer Stall-Motor Switch Machine Drivers - The circuits on this page are
switch machine drivers that can be used to operate Stall-Motor type switch machine
motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to
reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's
Model Train web site] |
|
5v Capacitance Touch Activated Momentary Switch - This circuit is discussed
in more detail in the section on Capacitance Proximity Switch Technology. The circuit
is powered from a standard +5v supply. It has both a source and sink output that
change state whenever a metal button connected to the circuit is touched. An earth
ground reference is required.... [Designed by David A. Johnson] |
|
5-Volt Momentary Operation Touch Switch - This simple circuit uses a single
IC to form a nice 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.... [Designed by
David A. Johnson] |
|
6 Bit µP's A/D Converter Decodes Keypad's Inputs - 10/13/94 EDN-Design
Ideas....Fig 1 shows a Mitsubishi M50927-XXXSP/FP 4-bit microcontroller decoding a 4×4
keypad using only four digital I/O lines instead of eight. Saving four of a 4-bit µC's
precious I/O lines couild be significant. 4-bit µC's ADC provides key to
savings. µC's output lines, F1 through F4, energize keypad's column lines
one at a time via 74HC4049 buffer/driver.... [Design Idea by Ryoden International
(Shanghai) Ltd, Shanghai, China] |
|
70m Ohm Protected Load Management Switch - DN117 Design Notes (Linear
Technology) (app note added 2/06) |
|
8 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. However,.... [Design Idea by
Chester Simpson, National Semiconductor, Santa Clara, CA] |
|
8 x 8 Audio Video Switch - (circuit / design added 8/03) [Peter Jakab,
Electrical Engineer, Engineer of Informatics] |
|
A 4-Digit Keypad Controlled Switch - This is a Universal version of the
Four-Digit Alarm Control Keypad. I have modified the design to free up the relay
contacts. This allows the circuit to operate as a general-purpose switch. I've
used a SPCO/SPDT relay, but you can use a multi-pole relay if you wish....(electronic
schematic added 05/09) [Designer Ron J.] |
|
A Clock Design using the PIC16c54 for LED Displays & Switch Inputs -
Microchip Application Note Published 26-Aug-97....[App Note] |
|
A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers Through the
LMV225 & an Efficient Switcher - National Semiconductor Application
Note....[App Note] |
|
AC continuity tester finds single ended faults in cables - 21-Feb-08 Issue
of EDN A continuity tester injects an AC signal into the conductors of a cable
to find circuit faults.... [Design Idea by Kevin Bilke, Maxim Integrated Products,
Fleet, Hants, UK] |
|
AC Switch circuit - An AC triggered switch for low frequency signals….
[Designer Andy Collison] |
|
AC Switching with TRIAC From TTL - The MC3032 is an optoisolator TRIAC
driver. The 180-ohm resistor sets the current for the LED emitter in the optoisolator.
Change the value of this resistor, if necessary, to get reasonable current ASCII
format (e.g., 15 mA). Note that you cannot test this circuit without a
load. The TRIAC will not switch unless connected to an AC voltage source, so you can't
test it for simple switching w/o applying AC and a load. Note the 500V ating on the
.01 cap. (ASCII format circuit / schematic design added 6/06) |
|
AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital
Potentiometer - AN-712 Analog Devices Application Notes....[App Note]
|
|
AD7416/AD7417/AD7418 Power-On Reset Circuit - AN-588 Analog Devices
Application Notes....[App Note] If a large number of decoupling capacitors are
used on VDD line, re-applying power before VDD has discharged to 0 V can cause
AD7416/AD7417/AD7418 to reset into an unknown. state. |
|
Add a grounded-switch feature for Topswitch on/off control - 21-Jun-07 Issue
of EDN Adding a couple of components to the control pin of a Topswitch switching
regulator enables on/off control.... [Design Idea by Robert N Buono, Aeolian Audio
LLC, Bloomfield, NJ] |
|
ADG794-a 2.5 V Input Signal Range Swithcing Solution for HDTV - AN-802
Analog Devices Application Notes (app note added 2/06) |
|
Advances in High Speed Design in Dispersively Attenuating Environments Circuit Boards
& Cables - ....deals with advances made in methods for....aiding the design
and analysis of high performance digital....through dipersively attenuating paths.
Agilent Application Note 2002-04-10 (app note added 06/06/06) |
|
Alternate Action Button - By pressing S1 momentary switch, the 4069
hex inverter will cause the relay to turn on. When S1 is pressed again it will cause
the relay to go off. This simple circuit can be used for the bases of many
projects. The transistor in the circuit provides enough current to drive the relay….
[Randy Linscott's circuit] |
|
Alternating on/Off Control - This circuit uses three easily available 555
timer ICs. All three work as astable multivibrators. The first 555 has an on period
and off period equal to 1 sec. This IC controls on/ off periods of
or 2 555s which are used to flash two bulbs through relay contacts.... [Tony van
Roon's circuit] |
|
AN-1095: Design of Isolated Converters using Simple Switchers - National
Semiconductor Application Note (app note added 2/06) |
|
AN-1438: A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers
Through the LMV225 & an Efficient Switcher - National Semiconductor
Application Note....[App Note] |
|
AN-213: Low Cost, Two-Chip, Voltage-Controlled Amplifier & Video Switch -
AN-213 Analog Devices Application Notes....[App Note] |
|
AN-251: Ron Modulation in CMOS Switches & Multiplexers - AN-251 Analog
Devices Application Notes....[App Note]What It Is and How to Predict Its Effect on
Signal Distortion |
|
AN-282: Fundamentals of Sampled Data Systems - AN-282-Analog Device
Application Notes....[App Note] |
|
AN-345: Grounding for Low-and-High-Frequency Circuits - AN-345-Analog Device
Application Notes....[App Note]Know Your Ground and Signal Paths for Effective
Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
|
|
AN-347: Shielding & Guarding - AN-347 Analog Devices Application Notes
(app note added 2/06)How to Exclude Interference-Type Noise. What to do and Why to do
it-A Rational Approach |
|
AN-348: Avoiding Passive-Component Pitfalls - AN-348-Analog Device
Application Notes....[App Note]The Wrong Passive Component Can Derail Even Best
OpAmp or Data Converter. Here Are Some Basic Traps to Watch For. |
|
AN-349: Keys to Longer Life for CMOS - AN-349 Analog Devices Application
Notes (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
|
|
AN-354: Ask the Applications Engineer 1-Multi Troubles - AN-354-Analog
Device Application Notes....[App Note]Addresses problems of ten encountered with LOG
Circuits, Time Division Analog Multiplexing, and ADC Power Strobing |
|
AN-355: Behind the Switch Symbol - AN-355 Analog Devices Application
Notes....[App Note]Use CMOS Analog Switches More Effectively When You Consider Them as
Circuits |
|
AN-447: Protection Schemes for BI-FET Amplifiers & Switches - National
Semiconductor Application Note (app note added 2/06) |
|
AN528: Implementing Wake-Up on Keystroke - Microchip Application Note
Published 26-Aug-97 (app note added 2/06) |
|
AN529: Multiplexing LED Drive & 4x4 Keypad Sampling - Microchip Application
Note Published 26-Aug-97 (app note added 2/06) |
|
AN552: Implementing Wake Up on Keystroke - Microchip Application Note
Published 26-Aug-97 (app note added 2/06) |
|
AN586: Macros for Page & Bank Switching - Microchip Application Note
Published 26-Aug-97 (app note added 2/06) |
|
AN-588: AD7416/AD7417/AD7418 Power-On Reset Circuit - AN-588 Analog Devices
Application Notes....[App Note] If a large number of decoupling capacitors are
used on VDD line, re-applying power before VDD has discharged to 0 V can cause
AD7416/AD7417/AD7418 to reset into an unknown. state. |
|
AN590: A Clock Design using the PIC16c54 for LED Displays & Switch Inputs -
Microchip Application Note Published 26-Aug-97....[App Note] |
|
AN-665: Channel Switching using Σ-Δ ADCs - AN-665 Analog Devices Application
Notes....[App Note]This application note refers to AD7708 and AD7718. Data
sheets specify update rate for Σ-Δ ADCs. |
|
AN-712: AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control
Digital Potentiometer - AN-712 Analog Devices Application Notes....[App
Note] |
|
AN-734: MF2 Compatible Keyboard with COP8 MicroControllers - National
Semiconductor Application Note (app note added 2/06) |
|
AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -
AN-772-Analog Device Application Notes....[App Note] |
|
AN-80-001 Using model PSW-1211 as a SPST switch - Application Note
MiniCircuits.com (app note added 2/06) |
|
AN-80-004 Using the RSW-2-25P switch - Application Note MiniCircuits.com
(app note added 2/06) |
|
AN-802: ADG794-a 2.5 V Input Signal Range Swithcing Solution for HDTV -
AN-802 Analog Devices Application Notes (app note added 2/06) |
|
AN892: Fail-Safe Monitoring & Clock Frequency Switching using the PIC16f684 -
Microchip Application Note Published 16-Dec-03....[App Note] |
|
Analog Switch Acts as DC/DC Converter - 01/20/00 EDN-Design Ideas....Many
low-current devices that require 65V supplies can operate reliably in a single 5V
power-supply environment if you use an appropriate localized dc/dc converter to
generate -5V bias. Often, capabilities and advantages of se 5V ICs far
outweigh minor inconvenience and added costs of an additional -5V-converter
function. Many.... [Design Idea by John P Skurla, Advanced Linear Devices Inc,
Sunnyvale, CA] |
|
Analog switch converts 555 timer into pulse width modulator - 15-Feb-07
Issue of EDN Added CMOS switch enhances a PWM oscillator.... [Design Idea by
Jordan Dimitrov, Tradeport Electronics, Vaughan, ON; Edited by Brad Thompson and Fran
Granville, Canada] |
|
Analog Switch Cuts Peak Detector Reset Time - 05/25/95 EDN-Design
Ideas....The schematic in Fig 1 is a basic configuration for a unity-gain peak
detector using the PKD-01FP monolithic peak detector from Analog Devices. The reset
time, tRES, is the time necessary to discharge the hold capacitor CH. tRES and
the acquisition time tACQ are functions of the IC's output-current capability. With
CH10 nF, this output-current limitation sets both tRES and tACQ to about 220 �sec....
[Design Idea by Gualtiero Bolognesi, Landis & Gyr, Peschiera Borronmeo, Italy] |
|
Analog switch expands I2C interface - 22-Nov-01 Issue of EDN Perhaps
the most effective way to gain board space and increase component density is to
minimize wiring on the board. A widely used architecture that allows such
miniaturization is the I2C bus. Comprising only a bidirectional data line, SDA, and a
clock line, SCL, this bus requires no chip selects or other additional connections....
[Design Idea by Luca Vassalli, Maxim Integrated Products, Sunnyvale, CA] |
|
Analog switch frees stuck I˛C bus - 26-Jun-03 Issue of EDN The
dual-channel PCA9540 I2C multiplexer often breaks up an I2C or SM bus or allows you to
use devices with the same addresses on the same bus. When the PCA9540 initially powers
up, it comes up in a state in which both channels are deselected. The I2 C- or SM-bus
master can then address the control register in the PCA9540 to select either Channel 0
or Channel 1, connecting the master to the ap.... [Design Idea by Bob Marshall,
Philips Semiconductor, Morgan Hill, CA] |
|
Analog switch lowers relay power consumption - 20-Dec-01 Issue of EDN
Designers often use relays as electrically controlled switches. Unlike transistors,
their switch contacts are electrically isolated from the control input. However, the
power dissipation in a relay coil may render the device unattractive in
battery-powered applications. You can lower this dissipation by adding an analog
switch that allows the relay to operate at a lower voltage (Figure 1].... [Design Idea
by Steve Caldwell, Maxim Integrated Products, Chandler, AZ] |
|
Analysis of NMR/MRI Coils using PIN Diode Switches - MicroNote 711 from
Microsem....[App Note] |
|
AN-H32: HT0640 for Electronic Line Switch - Supertex Semiconductors
(app note added 2/06) |
|
AN-H39: HT18 & HT19 for Electronic Line Switch - Supertex Semiconductors
(app note added 2/06) |
|
Anticipating timer switches before you push the button - 3-Apr-03 Issue of
EDN (Editor's note This Twilight Zone-worthy circuit will be the subject of an
upcoming network sitcom, My Big Fat Anticipating Timer.] It happens to almost everyone
that an apparatus or system should have been turned off a moment ago. The device in
question could be the car heater, the air conditioner, the lights.... [Design Idea by
Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland] |
|
Ask the Applications Engineer 1-Multi Troubles - AN-354-Analog Device
Application Notes....[App Note]Addresses problems of ten encountered with LOG
Circuits, Time Division Analog Multiplexing, and ADC Power Strobing |
|
Audio Activated Switch - This switch circuit is powered for years by a
single 3v lithium cell. Its transistor switch closes whenever the circuit
detects audio signals in excess of 50mv RMS. It can be used to trigger relays or
activate indicator lights. (added 12/04) …. [Designed by David A. Johnson] |
|
Audio Auto Shutoff - The purpose of this circuit is to automatically turn
off any device plugged into its power outlets after a certain period of time. Shutoff
is activated by an absences of an audio signal or by a standard timer function.
This unit would be connected to speaker terminals of a stereo system, tape outputs, TV
earphone jack or audio outputs etc. Once the audio signal drops below a predetermined
level a …. [Randy Linscott] |
|
Audio Controlled Christmas Lights - Here is a simple circuit to control
110VAC things such as Christmas Lights with low voltage audio. Be careful, high
voltage AC can kill you. “The basic Idea was to have Christmas lights flash with
the music. In my design I use an ordinary amplified computer speaker, a diode bridge,
and a ‘CRYDOM’ SSR (Solid State Relay). In order to increase the time that the lights
were on as well as protect the SSR I used a Diode Bridge to rectify the signal from
the amplifier circuit.”....(added 02/09) |
|
Audio Signal Activated Switch - Drawing only 2uA from a 3v lithium battery,
this circuit will turn on a transistor switch, whenever it detects an audio signal
greater than 0.035v RMS. [Designed by David A. Johnson] |
|
Audio Signal Detector/Switch - For some audio systems it is desirable to
have an automatic switch circuit turn on other devices, such as an amplifier, if an
audio signal is detected on one line. The hobby circuit below will activate a
transistor switch when it detects at least 50mv peak to peak of an audio signal.
The switch could be used to turn on a relay, routing the signal to where it is needed.
A single 3v lithium cell will power the electronic circuit for about 5 years. ….
[Hobby Corner Circuit by Dave Johnson] |
|
Audio Video Switch - This is an 8-input x-output audio/video switch module
to be controlled from a computer, for example from parallel port. Each
audio/video output can be switched to any of 8 inputs, separately.1-module
drives1-audio/video output and has a34-pin connector to plug into system
interface. You can use video OPA-s on 4051 output instead. Note that you can get full
integrated video multiplexers from Maxim.... [Peter Jakab, Electrical Engineer,
Engineer of Informatics] |
|
Audio Voice-Over Circuit - (electronic design added 6/07) |
|
Automatic Headlight Brightness Switch (Aaron Cake) - Driving the highway
with your high-beam headlights can really increase your visibility, but can be a
blinding hazard for other drivers. This simple circuit can be wired into your
headlight switch to provide automatic switching between high and low beam headlights
when there is oncoming traffic. It does this by sensing the lights of that traffic. In
this way, you can drive safely with your high-beams on without blinding other
drivers.... [Aaron Cake's design] |
|
Automatic Hen House Door Closer Opener - Find out how to put together a DIY
automatic hen house door opener and closer…. [REUK - Renewable Energy UK website] |
|
Avoiding Passive-Component Pitfalls - AN-348-Analog Device Application
Notes....[App Note]The Wrong Passive Component Can Derail Even Best OpAmp or
Data Converter. Here Are Some Basic Traps to Watch For. |
|
AVR 2x16 LCD & 4x4 keypad driver - A very simple circuit to experiment with
AT90S2313, 2x16 LCD display and 4x4 keypad. The clock based on 4 MHz crystal, but you
can use anyone crystal between 1-4 MHz. The keys with the name "A", "B"...."F" are
typed to the LCD with numbers 10-16. Because the AVR have only 15 I/O pins we are
working the LCD display with 4-bit databus. The 4 resistors (10K) are to protect the
AVR from the shortcuts as the coloumn of the keypad is change....(circuits added
05/09) |
|
Behavior of CMOS in hot insertion - Pericom Semiconductor Application Brief
# 039....[App Note] |
|
Big Endian to Little Endian Data Conversion using 3.3V Bus Switches -
Pericom Semiconductor Application Brief # 034....[App Note] |
|
Bipolar Transistor Boosts Switcher's Current by 12 times - 05/24/01 EDN-Design
Ideas....The circuit in Figure 1 uses a minimal number of external parts to raise the
maximum output current of a 0.5A buck switching-regulator IC to more than 6A. The
circuit accommodates input voltages of 15 to 60V and delivers output voltages of 3.3,
5, or 12V, depending on your choice of IC....PDf has several circuits, scroll to find
this one.... [Design idea by Wayne Rewinkel, National Semiconductor Corp, Santa Clara,
CA] |
|
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 - 8-Jul-04 Issue of EDN To
safely observe the 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], and one circuit, Y, which is closed only when both cylinders
are in a safe position (two normally open switches in series, Figure 1].... [Design
Idea by Jean-Bernard Guiot, Mulhouse, France] |
|
Brakelight hookup - This circuit is NOT a pulser or flasher! What's so
special about this circuit? Well, the first third-brake light I installed I had to
pull a wire from the Third Brake Light all the way underneath the carpet to the
brake-pedal-switch and I thought it would be easier to pluck the signal of both
brakelights via the trunk. Bench-test your circuit first and apply power to the
circuit,.... [Tony van Roon's circuit] |
|
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
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
|
Build a negative-voltage power side switch - 14-Oct-04 Issue of EDN
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 by
Michael English, Micrel Semiconductor, San Jose, CA] |
|
Build a simple one-chip phototimer - 8-Jul-04 Issue of EDN 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 by Abel Raynus, Armatron
International, Malden, MA] |
|
Build a simple, soft-action muting switch - 14-Oct-04 Issue of EDN 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 the on/off transition times roughly equal.... [Design Idea
by John Firestone, Bremerhaven, Germany] |
|
Bus Load Isolation using a High Density 3.3V Bus Switch - Pericom
Semiconductor Application Brief # 033....[App Note] |
|
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] |
|
Bus Switch in PCI Hot Plug Applications - Pericom Semiconductor Application
Brief # 019....[App Note] |
|
|
