|
Radio Controlled 3way Light Switch - (electronic design / schematic added 2/05) |
|
RC Receiver hosts two independent Switches - 06/06/96 EDN-Design Ideas:
Typical inexpensive radio-control (RC)systems have servo-motor outputs, but no on/off
switch outputs. You can add two independent RC switches to a system without making any
transmitter or receiver modifications.....(design idea added 5/05) |
|
Receiver Circuit-Ultrasonic Switch - The circuit described generates (transmits)
ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control
system this cirucit comprises of a mini transmitter and a receiver circuit.
Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from
the transmitter and switches on a relay |
|
Reflected Infrared Light Switch - Infrared light reflected off a finger is used
to activate this switch circuit. (added 7/06) ….(designed by David A. Johnson) |
|
Relay driver saves substantial power - 07/02/98 EDN-Design Ideas: Using
the circuit in Figure 1, you can digitally control the light intensity of a lamp. The
control loop is based on a PLL, in which the VCO comprises a light-to-frequency
converter (TSL220)coupled to a light source that derives its drive from a switching
regulator (L4970A). The output.....(design idea added 2/06) |
|
Relay Toggle Circuit - This toggle circuit operates by using a couple 555 timers
wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first
timer and pin 5 is the output. The output at pin 5 will.... (added 05/06/07) |
|
Relay Toggle Circuit Using a 555 Timer - ….(circuit design added 05/09) |
|
Relay Toggle Circuit using a Dual 555 timer 556: This is probably the best toggle
circuit. - (circuit / schematic design added 6/06) |
|
Relay Toggle Circuit using a Single Transistor and Push Button - (circuit /
schematic design added 6/06) |
|
Remote Control turns Battery on and Off - 09/12/97 EDN-Design Ideas: (design
idea added 4/05) |
|
Remote Doorbell Indicator - (circuit / design added 8/03) |
|
Remote Doorbell Warning Switch - This circuit should only be used with the
solenoid type chime doorbells, the electronic type that play tunes will not work here.
The hardest part for this circuit was the title. It is quite easy to miss the sound of
a doorbell if you are watching TV , this circuit gets round the problem by providing a
visual indication, i.e. a lamp....(added 2/06) |
|
Remote Switch uses No Power Fiber Optic Link - 10/10/96 EDN-Design Ideas:
(design idea added 4/05) |
|
Route Control for Stall Motor Switch Machines - (circuit / schematic design added
6/06) |
|
RS-232 DB-9 Switch-to-Flip between Two Serial Ports - (circuit / schematic design
added 6/06) |
|
RS232c Powers and Reads 8 Bit Switch Matrix - 04/11/96 EDN-Design
Ideas:.....(design idea added 6/06) |
|
RS232C Serial Port Scans Remote Keypad - 12/04/97 EDN-Design Ideas: (design
idea added 3/03) |
|
Safe Universal Mains Switching Box (Silicon Chip magazine, May 2006) - I (Bob
Barker) didn't design this. Bill De Rose (ex Dick Smith Electronics Kits Dept) came up
with this brilliantly simple project which allows any low voltage switch or switching
circuit to safely control any 240V mains-powered appliance up to 10A. The uses are
nearly endless. |
|
SB-100: Subscriber Line Card for Central Office Telephone Switching Equipment -
National Semiconductor Application Note (app note added 6/06) |
|
Scalable Latch Requires No Capacitors or Clock - 08/19/04 EDN-Design Ideas:
Circuits that latch one-of-N switches usually use a digital approach. Such circuits
are often useful in human-interface situations, such as audio-mixing consoles,
video-feed selection, or current-loop-control redundancy systems. In high-precision
analog systems, such as high-fidelity audio or video,.....(design idea added 1/06) |
| Scanmate Audio Activated Recorded - (Tony van Roon's
schematic / circuit added 10/02) |
|
Scheme improves on Low cost keyboard - 10/30/03 EDN-Design Ideas: You can
easily improve on a previous Design Idea to produce a slightly simpler resistor
arrangement with better timing balance between switches, using a single resistor value
(Reference 1, Figure 1). The use of a single resistor value, RS, in a series chain for
the switch resistors gives the timing parameters.....(design idea added 1/05) |
|
Security Circuit Eschews Sophistication - 05/26/94 EDN-Design Ideas: Because
of the many states involved in implementing sequential combination locks, most
designers use a microcontroller or a PLD. But for those die-hard discrete designers
who don't want to bother with debugging programs, here's a dead-simple circuit that
verifies a security code's entry from a 10-digit keypad.....(design idea added 3/03) |
|
Sequential State Machine Aids in Automatic Control - 09/02/04 EDN-Design Ideas:
Creating a sequential state machine is a common approach for automatic-control design.
The method finds wide use for controlling sequential processes in industry, robotics,
and measuring. The concept of a state machine is simple: A number of states describe a
process under control; each state.....(design idea added 1/05) |
|
Ser-Key 10-Key Serial Keypad Encoder - (circuit / schematic added 6/05) |
|
Shadow Activated Motion Detector Circuit - There are many ways one can detect
nearby human or object motion. This circuit demonstrates one way. It
detects motion by noting the changes in the shadow cast by the moving object. The
hobby circuit below works quite well in typical indoor room lighting. I would
not recommend its use in direct sunlight. Two small PIN photodiodes positioned
about one inch apart form a shadow detector. With no shadow cast on the devices,
both devices produce nearly identical current levels. The current is converted
to a voltage with a load resistor in parallel with the photodiode.... ….(designed by
David A. Johnson) |
|
Signal Detecting Auto Power on Unit - For equipment to be turned on with the main
amp. Detects signal and applies power. (circuit / design added 8/03) |
|
Simple continuity tester fits into shirt pocket - 01/10/08 EDN-Design Ideas:
This Design Idea describes a handy continuity tester with two modes of operation: It
may sound if it detects continuity between its two probes, or it may sound when it
detects no continuity. The second option permits testing for intermittent cable
breaks. Response must be.....(design idea added 02/08) |
|
Simple 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) |
|
Simple MIDI Switcher - (circuit / schematic added 6/05) |
|
Simple optical switch - ….(circuit design added 08/08) |
|
Simple toggle circuits illustrate low power MOSFET leakage - 08/07/08 EDN-Design
Ideas: A novelty circuit demonstrates the low leakage of modern power MOSFETs.....(design
idea added 09/08) |
|
Single IC based electronic circuit replaces mechanical switch - 03/15/07 EDN-Design
Ideas: Flip-flops debounce pushbutton switch.....(design idea added 9/08) |
|
Single Processor Pin Controls On/Off Function - 04/29/04 EDN-Design Ideas: 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-down request from a press
of the power switch until all routines exited properly.....(design idea added 1/05) |
|
Single Switch Controls digital potentiometer (2/02) - 02/07/02 EDN-Design Ideas:
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 in Figure 1 uses
one IC, one switch, and 10 discrete components.....(design idea added 10/03) |
|
Single Switch Controls digital potentiometer (9/02) - 09/19/02 EDN-Design Ideas:
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 with the fourth,
which........(design idea added 10/03) |
|
Single switch selects one of three signals - 03/02/06 EDN-Design Ideas:
Total cost is less than $1.....(design idea added 05/06/07) |
|
Single switch serves dual duty in small microprocessor based system - 03/30/06 EDN-Design
Ideas: Low-cost, easy-to-use design allows monitoring of peripherals,
sensors.....(design idea added 10/06) |
|
Single wire keypad interface frees microcontroller I/O pins - 03/31/05 EDN-Design
Ideas: (design idea added 5/05) Using this interface topology, you can
reduce the number of keypad interface wires to just one and thus save critical
microcontroller I/O ports. |
|
Sleep Switch Cum Wake up Timer - (circuit / schematic design added 6/06) |
|
Sleeping Aid - Based on electromagnetic-field radiation Place it under the
pillow-Built-in Timer (added 9/04) |
|
Slot Termination Components for Pentium II and Xeon Processor-Based Multiprocessor
Systems - Pericom Semiconductor Application Brief # 026 (app note added 02/05) |
|
Smart Foot Switch - (electronic Circuit / Schematic added 10/04) |
|
Smart switch cuts transformer turn on Current - 04/23/98 EDN-Design Ideas:
[Note: File contains multiple circuits scroll to find this circuit.]
Transformer-core saturation can cause inexplicable fuse blowing, system crashes, or
premature switch and relay failure. When a core saturates, it loses its inductive
characteristics; primary winding.....(design idea added 11/05) |
|
Soft On/Off Switch - Modern electronic equipment incorporate
"push-to-on-push-to-off" switches that do not make noise as with old equipment. An
example of this is the power button on a ATX computer cabinet. Here is a circuit that
does the same. It can be used to turn on/off .... (added 14/02) |
|
Solenoid trip circuit Works at Battery's end of life - 07/08/04 EDN-Design Ideas:
This Design Idea involves a low-power motion-detector circuit that operates from
battery power for extended times. Part of the design includes a solenoid-operated trip
mechanism that triggers whenever it detects motion. The drive circuit for the solenoid
in the original design worked fine as long as the battery was fresh but failed as the
battery got into the middle of its life, even though suf.....(design idea added 1/05) |
|
Solid State Relay Saves Battery's Life - 09/01/94 EDN-Design Ideas: The
circuit in Fig 1 uses a low-resistance p-channel FET, Q4, to disconnect a load from
the battery when the battery's voltage drops below a certain value. After you
disconnect the circuit, it remains off until you remove and replace the
battery.....(design idea added 5/02) |
|
Solid State Switch for DC Operated Gadgets - (electronic Circuit / Schematic added
10/04) |
|
Sound Activated Toy - This circuit makes a flower bop to the beat of music. The
flower stem contains a crooked wire which is spun by the motor. The circuit is a
microphone driven peak-detecting one-shot and works very well. The microphone is in a
sponge mount to insulate it from the vibration of the running motor. Similar circuits
are used to drive rock'n coke cans (added 2/05) |
|
Sound Operated Switch - This sensitive sound operated switch can be used with a
dynamic microphone insert as above, or be used with an electret (ECM) microphone. If
an ECM is used then R1 (shown dotted) will need to be included. A suitable value would
be between 2.2k and 10kohms. The two BC109C transitors form an audio preamp, the gain
of .... (added 2/06) |
|
Sound triggered flash - If you wish to take a picture of a fleeting event which
generates a sound, you can do it with this sound activated trigger. It does not
require any power supply: it feeds on the high voltage available on the flash trigger
terminal. Any economic ceramic microphone is suitable for the purpose....(added 9/07) |
|
SPST pushbutton switch combines power control user input functions - 09/28/06 EDN-Design
Ideas: One control serves multiple functions.....(design idea added 9/08) |
|
Stereo amplifier IC's outputs drive multiple loads - 11/21/05 EDN-Design Ideas:
Reference provides constant bias voltage regardless of supply-voltage
variations.....(design idea added 10/06) |
|
Stop Light Switch Circuit - When the brake pedal is on depressed, battery positive
voltage normally applies through the STOP fuse and stop light switch to terminal STP–
of the ECU, and the ECU turns the cruise control off…..(electronic design added 6/07) |
|
Switch Circuits - collection of Switch Circuits for temperature, light level and
button controlled switching (added 5/02) |
|
Switch Debouncer - (electronic design added 6/07) |
|
Switch Debouncer uses Only One Gate - 05/30/02 EDN-Design Ideas: The
circuit in Figure 1 produces a single debounced pulse each time you press S1.
Moreover, the circuit uses only logic power from the remote pull-up resistor, R2. You
can use the circuit to detect when a key is pressed in a nonenergized device, such as
a device in a system that's just coming up from standby.....(design idea added 10/03) |
|
Switch De-bouncer Using a 555 Taken from Forrest Mims Mini Notebook. - (circuit
design added 10/06) |
|
Switch Intelligently Controls Current - 03/30/00 EDN-Design Ideas: This
circuit can intelligently control ac or dc current when connected in series with a
load.....(design idea added 6/06) |
|
Switcher improves overVoltage protection circuit - 06/10/04 EDN-Design Ideas:
Overvoltage-protection circuits often protect electronic devices from power-supply
transients, such as a rise from plugging in batteries or an external power adapter.
Although these devices traditionally find use as hysteretic switching controllers, you
can reconfigure one to provide a robust overvoltage-protection circuit.....(design
idea added 1/05) |
|
Switching System - (electronic Circuit / Schematic added 10/04) |
|
TB056: 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) |
|
Telephone Hold Button (Aaron Cake) - (circuit / schematic design added 04/03/02) |
|
Test System Signal Switching - Agilent Application Note (added 6/06) |
|
The Behavior of CMOS in hot insertion - Pericom Semiconductor Application Brief #
039 (app note added 02/05) |
|
Thermal Switches provide circuit disconnect - 09/04/03 EDN-Design Ideas: A
single temperature sensor can provide an interrupt to a microcontroller when the
measured temperature goes out of range. You need multiple temperature sensors when you
have to monitor more than one hot spot. A microcontroller implements the proper
protective action when one of the temperature monitors detects an overtemperature
condition.....(design idea added 1/05) |
|
Thermostat With Adjustable Hysteresis - This small thermostat allows you to select
the size of its hysteresis. You can set both the temperature at which the relay will
energize, and the temperature at which the relay will de-energize. The difference
between these two temperatures is the hysteresis. |
|
Three parts provide tenfold increase in Switcher Current - 08/22/02 EDN-Design
Ideas: Industrial-control circuits often derive their power from widely varying
sources that can exceed the 40V maximum rating of popular switching ICs. This Design
Idea presents a simple, flexible, and inexpensive buck switcher that converts an input
voltage as high as 60V to 5V at several amps. The circuit is.....(design idea added
1/05) |
|
Three state switch interface uses one microcontroller pin - 02/21/08 EDN-Design
Ideas: A single microcontroller I/O pin senses the state of a three-position
switch.....(design idea added 09/08) |
|
Through Glass Push Button Switch - This simple technique allows a mechanical
pushbutton switch assembly to activate a reed type relay through a pane of thick
glass. Pushing the button moves a magnet near the reed relay, closing the relay
contacts. ….(designed by David A. Johnson) |
|
Throughput Expansion with FET Based Crossbar Switching - Pericom Semiconductor
Application Note # 045 (app note added 02/05) |
|
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) |
|
Tiny RGB Video Multiplexer Switches Pixels at 100MHz - DN205 Design Notes
(Linear Technology) (app note added 6/06) |
|
Toggle Switch Control of Twin Coil Switch Machines - These circuits allow an ON-ON
type DPDT toggle switch to control a twin coil switch machine motor. The handle of
switch can then be used to indicate the route selected. The circuits are also able to
control LEDs that could be used to indicate the selected route....(electronic circuit
added 7/03) |
|
Touch Activated Alarm (Tony van Roon) - (electronic schematic / circuit added
4/02) |
|
Touch activated timer switch extends battery life - 07/10/08 EDN-Design Ideas:
Designed to fit into the battery compartment of an optical mouse, this circuit
automatically shuts off the battery after a time delay.....(design idea added 09/08) |
|
Touch Dimmer - (electronic Circuit / Schematic added 10/04) |
|
Touch Keypad - This board layout was created using the SOIC version of a
PIC16F627A without drawing the usual schematic first. Most of the part values
are etched on the Layout. The SIP resistor packs I used are 10k ohm, some
experimentation with this value may be useful....(circuit added 08/08/08) |
| Touch Switch (Aaron Cake) - A touch switch is a
switch that is turned on and off by touching a wire contact, instead of flicking a
lever like a regular switch. Touch switches have no mechanical parts to wear out, so
they last a lot longer than regular switches. Touch switches can be used in places
where regular switches.... (circuit added 08/08/08) |
|
Touch Switch (Randy Linscott) - This circuit uses a 555 timer as the bases of the
touch switch. You can learn more about 555 timers in the Learning section on my site.
When the plate is touched the 555 timer is triggered and the output on pin 3 goes high
turning on the LED and the buzzer for a certain period of time….(added 05/08) |
|
Touch Switch Circuits - All the circuits and projects we describe in these
articles consist of very important "building blocks" that you can add to other
designs. This time we describe the concept of touching a plate (or two plates
separated by a small gap) and turning a circuit ON or OFF. A TOUCH PLATE is classified
as a high impedance device....(electronic designs added 08/08/08) |
|
Touch Switch II - ….(electronic schematic added 08/08) |
|
Touch switch needs no DC return path - 02/03/05 EDN-Design Ideas: Common
designs for touch switches detect a decrease in resistance when a user's fingertip
either connects a contact to the circuit's common ground or supplies an injection of
60-Hz ac voltage, resulting from immersion in the electrostatic field that nearby
power lines radiate. But what if no nearby power lines exist and the equipment
operates from a battery source, such as in an automotive appl.....(design idea added
5/05) |
|
Touch Switch using Transistors - (Tony van Roon's circuit added 9/04) |
|
Touch Switches - (electronic circuit added 1/03) |
|
Transformer Driver Controlsbidirectional Switch - 07/17/97 EDN-Design Ideas:
-You can use a transformer-driver IC to simply control a MOSFET on/off
switch.....(design idea added 6/06) |
|
Translating DVD Video with Pericom's PI5C3245 and PI5C16212 Bus Switches - Pericom
Semiconductor Application Brief # 012 (app note added 02/05) |
|
Travel Touch Alarm - The Travel Touch Alarm can be used to provide a audible
alarm when someone touches the door knob or handle of your hotel room. The door
knob or handle must be made of metal for the circuit to work. The main chip in the
circuit is a 555 timer ….(added 08/08/08) |
|
TRIAC Light Controller - This project is intended for controlling mains powered
disco lighting, although there are many other possible uses for controlling almost any
mains appliance. It will control five seperate channels at up to 3 Amp per channel.
This could be increased by designing another PCB with wider tracks than the PCB
included with this design.... (added 2/06) |
|
TRIAC Light Controller zen22142 - (circuit / design added 8/03) |
|
TRIAC Lighting and Heating Controller uses Few Parts - 09/02/04 EDN-Design Ideas:
The triac lighting-control circuit in Figure 1 is small and inexpensive because load
and housekeeping power come directly from the line voltage, thereby eliminating bulky,
expensive supplies. The CLZD010 closed-loop controller maintains constant light
intensity by automatically adjusting the timing.....(design idea added 1/05) |
|
Turn on the aquarium lights every day at the same time - Turn on the sprinkler or
the aquarium lighting for the same period of the day. You can choose to operate the
output by every 2nd, 3rd day only. There is a manual start/stop button to immediately
turn on or off the output, and a disable button to completely turn off automatic
operation.....(design added 05/09) |
|
Two Buttons Provide Safe Start - 07/06/00 EDN-Design Ideas: The circuit in
Figure 1 provides a safety interlock that checks the actuation of two pushbuttons
before enabling a relay. When you push both buttons, the circuit actuates the relay.
At that point, you can release one of the switches without the relay'.....(design idea
added 7/03) |
|
Two Light Controlled Relays - These two circuits use LDRs (Light Dependent
Resistors). Circuit No.1 energizes the relay when the light rises above a preset
level. Use it to switch things on at dawn. Circuit No.2 energizes the relay when the
light falls below a preset level. Use it to switch things on at dusk. |
|
Two Line Intercom Plus a Telephone Changeover Switch - The circuit presented here
can be used for connecting two telephones in parallel and also as a 2-line intercom.
Usually a single telephone is connected to a telephone line. If another telephone is
required at some distance, a parallel line is taken for connecting the other
telephone. In this simple parallel line operation, the main problem is loss.....
(added 5/02) |
|
Two Temperature Controlled Relays - These two circuits use Thermistors
(Temperature Dependent Resistors). Circuit No.1 energizes the relay when the
temperature rises above a preset level. Use it to switch things on when it gets hot.
Circuit No.2 energizes the relay when the temperature falls below a preset level. Use
it to switch things on when it gets cold. |
|
Two wire four by four key keyboard interface saves power - 08/17/06 EDN-Design
Ideas: (design idea added 10/06) Resistor matrix and microcontroller
encode keypad. |
|
Typical Application For The UPG2150T5L Switch - Application Note California
Eastern Laboratories Doc #962 (app note added 6/06) |
|
Ultra Low Voltage N-Channel Analog Switch Transmission Gate - Circuit Ideas for
Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06) |
|
Ultrasonic Switch (Andrew Wilson) - The circuit described generates (transmits)
ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control
system this cirucit comprises of a mini transmitter and a receiver circuit.
Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from
the transmitter and switches on a relay....(electronic circuit added 4/05) |
|
Undershoot Protection When using Bus Switches - Pericom Semiconductor Application
Note # 030 (app note added 02/05) |
|
Universal Telephone Hold - (circuit / schematic design added 6/06) |
|
USB 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) |
|
USB switch - You can connect one USB device like a printer or scanner on 2
computers and controlled by software.….(electronic schematic added 03/09) |
|
Using model PSW-1211 as a SPST switch - AN-80-001 Application Note
MiniCircuits.com (app note added 08/08/08) |
|
Using the RSW-2-25P switch - AN-80-004 Application Note MiniCircuits.com
(app note added 08/08/08) |
|
VGA Switch - Digital VGA switch for switching between two PC monitors with MAX465
IC. (added 08/08/08) |
|
Video Routers - VISW 8 x4 Stereo audio/video router (added 5/02) |
|
Video Switcher - Monitoring several cameras on one monitor is usually done in one
of two ways: divide the screen into sections and show them all at once, or time
sequence the cameras onto the whole screen. This device uses the second method
(which, if you don't already know,….(electronic schematic added 08/08) |
|
Voice activated switch - The VS-1 provides quality components and a compact
printed circuit board that makes it a snap to “turn on” a multitude of devices, from
HAM transmitters and amps to tape recorders or clandestine listening
equipment.....HAVE FUN! ....(electronic design added 6/07) |
|
Voice over Circuit - switches automatically from sound source to microph1-when
enough sound comes in from microph1(added 5/02) |
|
Voltage Comparator Switch - (electronic schematic / circuit added 4/02) |
|
Voltage Controlled Switch using 555 - (electronic design added 6/07) |
|
Voltage-Based Controller for Switches - (circuit / schematic design added 6/06) |
|
VXI Switching Application Note 5968-7237 - Aligent Application Note (app
note added 04/05/06) |
|
Water Activated Relay - The circuit uses a 555 timer wired as an astable
oscillator and powered by the emitter current of the BC109C. Under dry conditions, the
transistor will have no bias current and be fully off. However as the probes get wet
the transistor will conduct and sounding the alarm. An On/Off switch is provided and
remember to use a non-reactive metal.....(electronic schematic / circuit added 4/02) |
|
Whistle on Whistle Off - This CMOS toggle flip flop circuit has an addition of two
bandpass filters and condenser microph1-so the relay can be toggled by whistling at
it. (added 5/02) |
|
Whistle Responder - Beeps when hears your whistle A gadget suitable for
key-holders, games etc. (added 9/04) |
|
Whistle Switch - (electronic schematic / circuit added 4/02) |
|
White LED Driver Backlights LCD and keypad - 11/13/03 EDN-Design Ideas:
Designers widely use white LEDs to backlight color LCDs and keypads in handheld
devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum
and brightness represent near-ideal light sources. One possible configuration for a
phone or a phone/PDA combination is to have a group of three LEDs to light the display
and six LEDs for the.....(design idea added 1/05) |
|
XY Keypad uses µC's Serial Port - 10/10/96 EDN-Design Ideas: (design idea
added 3/03) |
|
Zero-Delay Bus Switches - Pericom Semiconductor Application Note # 001 (app note
added 02/05) |
