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Hand Clap Lamp Control : What a way to drive a triac. This is the improved/redesigned version. (added 2/05) |
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High Current MOSFET Flip Flop with Debounced Pushbutton: (Circuit / schematic design added 6/06) |
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High
Efficiency Linear and Switching Solutions for Splitting a Digital Supply: DN172 - Design Notes (Linear Technology) (Circuit / schematic design added 6/06) |
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High side Current sensing switched mode regulator provides constant Current LED drive: 04/14/05 EDN Design Ideas /
(Circuit / schematic design added 6/06) Drive LEDs with constant-current source. |
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Hold Function for Telephone: (Circuit / schematic design added 6/06) |
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Hot-Plug and Hot-Swap Bus Switches: Pericom Semiconductor Application Note # 052 (Electronic circuit design added 02/05) |
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HT0640 for Electronic Line Switch: Supertex Semiconductors (app note added 2/06) |
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HT18 and HT19 for Electronic Line Switch: Supertex Semiconductors (app note added 2/06) |
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IBM PC keyboard to PalmPilot interface: (Electronic circuit added 4/05) |
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Impact of Undershoot on Bus Switches and Corresponding Solutions in PCI Hot-Plug Applications: Pericom Semiconductor
Application Brief # 029 (Electronic circuit design added 02/05) |
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Implementing Wake Up on Keystroke: Microchip Application Note - Published 26-Aug-97 (added 2/06) |
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Implementing Wake-Up on Keystroke: Microchip Application Note - Published 26-Aug-97 (added 2/06) |
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Improving the Accuracy of Optical Transceiver Extinction Ratio Measurements - (AN 1550-9): Agilent Application Note (Circuit / schematic design added 6/06) |
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Infra/radio Remote Control
Transmitter/receiver with PIC: (added 8/03) |
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Infrared Switch: (Electronic circuit added 4/05) |
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Infrared Transmitter and Receiver Schematic Diagrams: (added 8/03) |
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Inline equations offer hysteresis Switch in PSPICE: 08/16/01 EDN Design Ideas / (added 1/05) Smooth-transition switches are convenient devices in many Spice-based
simulators. Their action can greatly ease the convergence process. Unfortunately, these devices lack inherent hysteresis, a helpful feature used to build UVLO (undervoltage-lockout) systems,
oscillators, and other systems. Intusoft's |
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Interrupt driven
keyboard for MCS 51 uses few components: 05/26/05 EDN Design Ideas / (added 11/05) Interface keypad easily to a microcontroller I/O port. |
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IR Controlled Av Switch with S-Video Composite Video and Audio: (Circuit / schematic design added 6/06) |
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IR Remote Switch: (Electronic Circuit / Schematic added 10/04) |
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Journal of Internet Test
Methodologies: Agilent Application Note (Circuit / schematic design added 6/06) |
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Key
reading circuit saves I/O pins: 02/06/03 EDN Design Ideas / (added 1/05) Some microcontroller applications usually use too many I/O pins to read keys or onboard
switches; in many cases, few pins remain available for other uses. Some alternative ways to read keys yield more free pins. First, consider some ways to effect key reading. Table 1 presents a
comparison of four methods with references to circuit configurations (figures 1, 2, 3, and 4).... |
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Keyboard Video Mouse (KVM): Intersil Application Block Diagram (Circuit / schematic design added 6/06) |
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Keypad Encoder ComMands Tape Transport: 09/02/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) |
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Keys to Longer Life for CMOS: AN-349 - Analog Devices Application Notes (added 2/06)Here's How CMOS Can be Protected Against Abuse |
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LAN Switch in Ethernet Applications: Pericom Semiconductor Application Brief # 006 (added 2/05) |
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Laser Transmitter Schematics: (added 8/03) |
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Latching Power Switch uses momentary action pushbutton: 10/28/04 EDN Design Ideas / (added 11/05) Most inexpensive pushbutton switches, particularly pc-board-mounting and
membrane types, have momentary action. Latching types are often larger and relatively expensive, and they frequently are unavailable in the style you'd like to use. You can thus have a problem
if you need a small, inexpensive on/off switch for latching power to a load. |
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Lattice Semi GDS Chip Programmer software: Generic Digital Switches are in-circuit programmable devices made by Lattice Semiconductor that allow pin to pin routing, buffering, and
inversion. Perfect for making last minute circuit changes…. (added 11/05) |
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LED Boost Switcher: Single AA Cell Powers Two LEDs at Constant Current : (added 2/05) |
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Light Controlled Switch #2: output a control signal suitable for relay depending on the light level (Electronic circuit
added 5/02) |
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Light Detector Circuit: Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1's value is
chosen to match the photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as the trigger, U1b and c form a latch. S1 resets the circuit. The output device may
be a low power piezo buzzer. (added 2/06) |
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Light/Dark Detector: (Electronic Schematic / circuit added 4/02) |
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Lighting Third Brake Light: (Electronic Schematic / circuit added 4/02) |
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Lightning Activated Camera Shutter Trigger: This circuit is used to trigger a camera's electronic shutter circuit when a
flash of lightning is present. This circuit would also work for photographing fireworks displays or other events involving flashes of light. (Electronic Schematic / circuit added 4/02) |
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Li-ION Charge Termination IC Interfaces with PWM Switchers: DN242 - Design Notes (Linear Technology) (Circuit /
schematic design added 6/06) |
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Live Insertion in High Speed Data Communications using 3.3V Bus Switches: Pericom Semiconductor Application Brief # 031
(Electronic circuit design added 02/05) |
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Load
Sensing Automatic Switch: (added 8/03) |
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Logic
offers complementary switch Control: 12/06/01 EDN Design Ideas / (added 1/05) The complementary-switch controller in Figure 1 uses a few inverter gates to provide
drive signals for the complementary switches. Complementary-switch configurations find widespread use in synchronous-rectification circuits, charge pumps, full-bridge control circuits, and
other circuits. The circuit in Figure 1 provides not only a complementary drive signal but also a deadtime delay ... ... |
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Low
Power keypad consumes only 100 nA: 01/24/02 EDN - Design Ideas / (Electronic circuit added 10/03) Often in the use of products with keypads, one or more keys
become "stuck" or are being pressed. For example, a cell phone in the bottom of a purse or in a hip pocket could have one or more of its keys inadvertently pressed and held down for a
considerable period. Depending on the circuit design and implementation of the keypad interface, this condition could cause excess current to flow,... . |
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Low-cost
ultra high isolation SPDT switch: Application Note - MiniCircuits.com (Circuit / schematic design added 6/06) |
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Low-error
platinum RTD circuit has shutdown capability: 09/14/00 EDN-Design Ideas / (added 2/06) |
