|
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 nearly….....(design idea added 08/05) |
|
µC Provides Wireless Keypad Control - 10/08/98 EDN-Design Ideas: Scroll to
finde specific article. 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.....(design idea added 5/02) |
|
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 added 6/06) |
|
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. ….(circuit design added 11/08) |
|
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.
….(design added 08/08) |
|
2 wire 4 by 4 key keyboard interface saves power - 08/17/06 EDN-Design Ideas:
Resistor matrix and microcontroller encode keypad.....(design idea added 10/06) |
|
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 - (circuit / schematic design added 6/06) |
|
3.3V Bus Switches for PC100/PC133 DIMM Switching - Pericom Semiconductor
Application Brief # 032 (app note added 02/05) |
|
3rd Brakelight hookup - (Tony van Roon's electronic circuit added 08/09) |
|
4 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.....(design
idea added 3/03) |
|
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 ...(electronic design added 6/07) |
|
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....(circuit /
schematic design added 6/06) |
|
556 Timer Stall-Motor Switch Machine Drivers - The circuits on this page are
Switch Machine drivers that can be used to operate slow motion Stall-Motor type switch
machine motors. The circuits use LM556 dual timer chips to provide a
PUSH-PULL…(circuit added 04/05/06) |
|
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) |
|
70mOhm 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.....(design idea added 6/06) |
|
8 x 8 Audio Video Switch - (circuit / design added 8/03) |
|
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) |
|
A Clock Design using the PIC16c54 for LED Displays and Switch Inputs - Microchip
Application Note Published 26-Aug-97 (app note added 6/06) |
|
A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers Through the
LMV225 and an Efficient Switcher - National Semiconductor Application Note
(app note added 6/06) |
|
AC continuity tester finds single ended faults in cables - 02/21/08 EDN-Design
Ideas: A continuity tester injects an AC signal into the conductors of a cable
to find circuit faults.....(design idea added 02/08) |
|
AC Switching with TRIAC from TTL - 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 added
6/06) |
|
AD7416/AD7417/AD7418 Power-On Reset Circuit - AN-588 Analog Devices Application
Notes (app note added 6/06) 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 - 06/21/07 EDN-Design
Ideas: Adding a couple of components to the control pin of a Topswitch switching
regulator enables on/off control.....(design idea added 6/07) |
|
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
and 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….(added 08/08/08) |
|
Alternating on/Off Control - (Tony van Roon's electronic schematic / circuit added
4/02) |
|
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 and an Efficient Switcher - National Semiconductor Application
Note (app note added 6/06) |
|
AN-213: Low Cost, Two-Chip, Voltage-Controlled Amplifier and Video Switch - AN-213
Analog Devices Application Notes (app note added 6/06) |
|
AN-251: Ron Modulation in CMOS Switches and Multiplexers - AN-251 Analog Devices
Application Notes (app note added 6/06)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 added 2/06) |
|
AN-345: Grounding for Low-and-High-Frequency Circuits - AN-345-Analog Device
Application Notes (app note added 2/06) Know Your Ground and Signal Paths
for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just
Resistance.... |
|
AN-347: Shielding and 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 added 2/06) 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 added 2/06) 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 added 6/06)Use CMOS Analog Switches More Effectively When You Consider Them
as Circuits |
|
AN-447: Protection Schemes for BI-FET Amplifiers and 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 and 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 and 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 added 6/06) 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 and Switch Inputs -
Microchip Application Note Published 26-Aug-97 (app note added 6/06) |
|
AN-665: 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. |
|
AN-712: AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control
Digital Potentiometer - AN-712 Analog Devices Application Notes (app note
added 6/06) |
|
AN-734: MF2 Compatible Keyboard with COP8 Microcontrollers - National
Semiconductor Application Note (app note added 2/06) |
|
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package LFCSP
- AN-772-Analog Device Application Notes (app note added 2/06)
|
|
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 and Clock Frequency Switching using the PIC16f684 -
Microchip Application Note Published 16-Dec-03 (app note added 6/06) |
|
Analog Switch Cuts Peak Detector Reset Time - 05/25/95 EDN-Design Ideas:
(design idea added 6/06) |
|
Analog Switch expands I 2 C interface - 11/22/01 EDN-Design Ideas: Perhaps
most effective way to gain board space and increase component density is to minimize
wiring on board. A widely used architecture that allows such miniaturization is
I2C bus. Comprising only a bidirectional data line, SDA, and a clock line, SCL, this
bus requires no chip selects or or additional connections.....(design idea added 1/05) |
|
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 added 05/03) |
|
Analog switch converts 555 timer into pulse width modulator - 02/15/07 EDN-Design
Ideas: CMOS switch enhances a PWM oscillator.....(design idea added 9/08) |
|
Analog Switch Cuts Peak Detector Reset Time - 05/25/95 EDN-Design Ideas:
(design idea added 5/03) |
|
Analog Switch frees stuck I˛C Bus - 06/26/03 EDN-Design Ideas: The
dual-channel PCA9540 I2C multiplexer often breaks up an I2C or SM bus or allows you to
use devices with same addresses on same bus. When PCA9540 initially
powers up, it comes up in a state in which both channels are deselected. The I2 Cor
SM-bus master can n address control register in PCA9540 to select eir
Channel 0.....(design idea added 12/04) |
|
Analog Switch Lowers relay Power consumption - 12/20/01 EDN-Design Ideas:
Designers often use relays as electrically controlled switches. Unlike transistors, ir
switch contacts are electrically isolated from control input. However,
power dissipation in a relay coil may render device unattractive in
battery-powered applications. You can lower this dissipation by adding an analog
switch that allows relay to operate at a lower voltage (Figure 1).....(design
idea added 1/05) |
|
Analysis of NMR/MRI Coils using PIN Diode Switches - MicroNote 711 from Microsem
(app note added 6/06) |
|
AN-H32: HT0640 for Electronic Line Switch - Supertex Semiconductors (app
note added 2/06) |
|
AN-H39: HT18 and HT19 for Electronic Line Switch - Supertex Semiconductors
(app note added 2/06) |
|
Anticipating timer Switches Before you push the Button - 04/03/03 EDN-Design
Ideas: (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 added 12/04) |
|
Ask the Applications Engineer 1-Multi Troubles - AN-354-Analog Device Application
Notes (app note added 2/06) 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
….(added 4/2002) |
|
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 Detector/Switch - This circuit will activate a transistor switch when
it detects at least 50mv peak to peak of an audio signal. It could be used to
turn on a relay, routing the signal to were it is needed. (added 7/06)
….(designed by David A. 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. (added 6/06) |
|
Audio Voice-Over Circuit - (electronic design added 6/07) |
|
Automatic Headlight Brightness Switch (Aaron Cake) - (circuit added 03/03/03) |
|
Avoiding Passive-Component Pitfalls - AN-348-Analog Device Application Notes
(app note added 2/06) The Wrong Passive Component Can Derail Even Best
OpAmp or Data Converter. Here Are Some Basic Traps to Watch For. |
|
AVR 2x16 LCD and 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 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) |
