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µC Implements Pushbutton Light Dimmers: 06/18/98 EDN-Design Ideas / (Circuit / schematic design added 6/06) A project
required building a synchronous-demodulator circuit to track a line drawn on paper. The beauty of the synchronous-modulator/demodulator approach is its inherent noise rejection. The method
rejects nearly all out-of-band noise, whether from internal drift or external illumination.... |
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µC
Provides Wireless Keypad Control: 10/08/98 EDN-Design Ideas / (Schematic / circuit design added 08/05) Portable systems, such as telephone handsets, make extensive use of low-dropout
(LDO) regulators. These components provide noise-sensitive parts with a stable power-supply line. When a telephone enters standby mode, most of the circuits go to sleep by disabling....
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2-wire, 4-by-4-key keyboard interface saves power: 8/17/06 EDN - Design Ideas / (added 10/06)
Resistor matrix and microcontroller encode keypad. |
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20
Watt Simple Switcher Forward Converter: National Semiconductor Application Note 01 May1998 (Circuit / schematic design added 6/06) |
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250kHz 1mA I Q Constant Frequency Switcher Tames Portable Systems Power: DN108 - Design Notes (Linear Technology)
(added 1/06) |
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27MHz AM/CW Transmitter: (Circuit / schematic design added 6/06) |
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3 Way Touch Lamp: A three-way switch to control a lamp (off-dim-bright, etc.) uses an NE555 Timer to generate a1-second
pulse, triggered by ambient ac fields that are picked up by the human body. Read also the circuit description. (Electronic circuit added 5/02) |
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3.3V Bus Switches for PC100/PC133 DIMM Switching: Pericom Semiconductor Application Brief # 032 (app note added
02/05) |
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4 bit µP's A/D
converter decodes keypad's inputs: 10/13/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) 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. The 4-bit µC's ADC provides the key to the savings. The µC's
output lines, F1 through F4, energize the keypad's column lines one at a time via 74HC4049 buffer/driver..... |
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4 Digit Keypad:
(added 9/02) |
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555 Timer MonoStable Circuit using Pushbutton: (Circuit / schematic design added 6/06) |
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70mOhm Protected Load Management Switch: DN117 - Design Notes (Linear Technology) (app note added 2/06) |
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8 Switcher Powers High Performance µPs: 04/13/95 EDN-Design Ideas / (Circuit / schematic design added 6/06) |
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8 x 8
Audio Video Switch: (added 8/03) |
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A 4-Digit Keypad Controlled Switch: (electronic design added 10/06) |
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A Clock Design using the
PIC16c54 for LED Displays and Switch Inputs: Microchip Application Note - Published 26-Aug-97 (app note added 6/06) |
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A Design and Manufacturing Guide for the Lead Frame Chip Scale Package: AN-772 - Analog Devices Application Notes
(added 2/06) |
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A Modulation
Index Switch for the MLX90121: Melexis Application Note (app note added 6/06) |
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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) |
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AC Switching
with TRIAC from TTL #2: (Circuit / schematic design added 6/06) |
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AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital Potentiometer: AN-712 - Analog Devices
Application Notes (app note addedd 6/06) |
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AD7416/AD7417/AD7418 Power-On Reset Circuit: AN-588 - Analog Devices Application Notes (Circuit / schematic design
added 6/06) If a large number of decoupling capacitors are used on the VDD line, re-applying power before VDD has discharged to 0 V can cause the AD7416/AD7417/AD7418 to reset into an
unknown. state. |
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ADG794-a 2.5 V Input Signal Range Swithcing Solution for HDTV: AN-802 - Analog Devices Application Notes (added 2/06) |
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Advances in High Speed Design in Dispersively Attenuating Environments (Circuit Boards and Cables): Agilent Application
Note (Circuit / schematic design added 6/06) |
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Alternating on/Off Control: (Electronic Schematic / circuit added 4/02) |
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AN-1095: Design of
Isolated Converters using Simple Switchers: National Semiconductor - Application Note (app note added 2/06) |
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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 (Circuit / schematic design added 6/06) |
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AN-213: Low Cost, Two-Chip, Voltage-Controlled Amplifier and Video Switch: AN-213 - Analog Devices Application Notes
(Circuit / schematic design added 6/06) |
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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 |
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AN-282: Fundamentals of Sampled Data Systems : AN-282-Analog Device Application Notes (app note added 2/06)
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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.... |
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AN-347:
Shielding and Guarding: AN-347 - Analog Devices Application Notes (added 2/06)How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach |
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AN-348:
Avoiding Passive-Component Pitfalls : AN-348-Analog Device Application Notes (added 2/06) The Wrong Passive Component Can Derail Even the Best OpAmp or Data Converter.
Here Are Some Basic Traps to Watch For. |
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AN-349: Keys to Longer Life for CMOS: AN-349 - Analog Devices Application Notes (app note added 2/06)Here's How CMOS Can be Protected Against Abuse |
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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 |
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AN-355: Behind the Switch Symbol: AN-355 - Analog Devices Application Notes (Circuit / schematic design added
6/06)Use CMOS Analog Switches More Effectively When You Consider Them as Circuits |
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AN-447: Protection
Schemes for BI-FET Amplifiers and Switches: National Semiconductor - Application Note (app note added 2/06) |
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AN528: Implementing Wake-Up on Keystroke: Microchip Application Note - Published 26-Aug-97 (app note added 2/06) |
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AN529: Multiplexing LED Drive and 4x4 Keypad Sampling: Microchip Application Note - Published 26-Aug-97 (app note
added2/06) |
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AN552: Implementing Wake Up on Keystroke: Microchip Application Note - Published 26-Aug-97 (app note added 2/06) |
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AN586: Macros for Page and Bank Switching: Microchip Application Note - Published 26-Aug-97 (app note added 2/06) |
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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 the VDD line, re-applying power before VDD has discharged to 0 V can cause the AD7416/AD7417/AD7418 to reset into an unknown. state. |
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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) |
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AN-665: Channel Switching using Σ-Δ ADCs: AN-665 - Analog Devices Application Notes (app note added 6/06) This
application note refers to the AD7708 and AD7718. Data sheets specify the update rate for Σ-Δ ADCs. |
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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) |
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AN-734: MF2
Compatible Keyboard with COP8 Microcontrollers: National Semiconductor - Application Note (app note added 2/06) |
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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) |
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AN-80-001 Using model PSW-1211 as a SPST switch: Application Note - MiniCircuits.com (app note added 6/06) |
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AN-80-004 Using the RSW-2-25P switch: Application Note - MiniCircuits.com (app note added 6/06) |
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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) |
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AN892: Fail-Safe Monitoring and Clock Frequency Switching using the PIC16f684:
Microchip Application Note - Published 16-Dec-03 (app note added 6/06) |
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Analog Switch Cuts Peak Detector Reset Time: 05/25/95 EDN-Design Ideas / (Circuit / schematic design added 6/06)
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Analog Switch expands I 2 C interface: 11/22/01 EDN Design Ideas / (added 1/05) 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. ... |
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Analog Switch frees stuck I˛C Bus: 06/26/03 EDN Design Ideas / (added 1/05) 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...... |
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Analog Switch Lowers relay Power consumption: 12/20/01 EDN Design Ideas / (added 1/05) 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). ... |
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Analysis of NMR/MRI
Coils using PIN Diode Switches: MicroNote 711 from Microsem (app note added 6/06) |
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AN-H32: HT0640 for Electronic Line Switch: Supertex Semiconductors (app note added 2/06) |
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AN-H39: HT18 and HT19 for Electronic Line Switch: Supertex Semiconductors (app note added 2/06) |
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Anticipating timer Switches Before you push the Button: 04/03/03 EDN Design Ideas / (added 1/05) (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.... |
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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 |
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Audio Auto Shutoff: purpose of this circuit is to automatically turn off any device plugged into its power outlets after a
certain period of Time of silence (Electronic circuit added 5/02) |
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Audio Auto-Shutoff: (circuit added 10/06) |
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Audio
Video Switch: This is an 8-input x-output audio/video switch module to be controlled from a computer, for example from the parallel port. Each audio/video output can be switched to
any of the 8 inputs, separately.1-module drives1-audio/video output and has a34-pin connector to plug into the system interface. You can use video OPA-s on the4051 output instead. Note that
you can get full integrated video multiplexers from Maxim. (Circuit / schematic design added 6/06) |
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Automatic Headlight Brightness Switch: (circuit added 7/02) |
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Avoiding Passive-Component Pitfalls: AN-348-Analog Device Application Notes (app note added 2/06) The Wrong Passive
Component Can Derail Even the Best OpAmp or Data Converter. Here Are Some Basic Traps to Watch For. |
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Behavior of CMOS in hot insertion: Pericom Semiconductor Application Brief # 039 (app note added 02/05) |
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Big Endian to Little Endian Data Conversion using 3.3V Bus Switches: Pericom Semiconductor Application Brief # 034 (app
note added 02/05) |
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Bipolar Transistor
Boosts Switcher's Current by 12 times: 05/24/01 EDN-Design Ideas / (added 8/03) |
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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 the
input to the center point of the Schmitt trigger’s hysteresis. Designed by
Andrew R. Morris
(Circuit / schematic design added 6/06) |
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Boole
helps simplify Wiring and save money: 07/08/04 EDN Design Ideas / (added 1/05) 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.... |
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Build
a negative Voltage power side switch: 10/14/04 EDN-Design Ideas / (added 5/05) 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, enabled by a digital signal. The MIC4451 comprises an input buffer with a
small amount of hysteresis and several logic inverter/buffers that ultimately drive a high-current output stage.. . |
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Build
a simple one chip phototimer: 07/08/04 EDN Design Ideas / (added 11/05) 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... |
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Build
a simple soft action muting switch: 10/14/04 EDN-Design Ideas / (added 5/05) 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. R2 and D3 quickly discharge C1 and mute the signal during power-down. For this process to work, the signal path should remain stable to below
roughly one-third the normal supply voltages—below ±4V.... |
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Bus Load Isolation using a High Density 3.3V Bus Switch: Pericom Semiconductor Application Brief # 033 (app note added
02/05) |
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Bus Switch Applications (For Laptop Computers; Memory Modules; A/D
Video; Etc): Pericom Semiconductor Application Brief # 013 (app note added 2/05) |
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Bus Switch for Memory Switching: PI5C16292: Pericom Semiconductor Application Brief # 018 (app note added 02/05) |
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Bus Switch in PCI Hot Plug Applications: Pericom Semiconductor Application Brief # 019 (app note added 02/05) |
