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Input Attenuator for the Digital Audio Millivoltmeter - If you'd like to be able to use our Digital Audio Millivoltmeter to measure AC voltages up to 140V RMS, this add-on project is the answer. It's a simple switched input divider which lets you add 40dB, 20dB or 0dB of attenuation ahead of the meter at the touch of a knob.__ SiliconChip
Installing a Free-Air Subwoofer In Your Car - You dont need to take up lots of room with a big box; this uses the boot as the enclosure. And it w__ SiliconChip
In-System programming adapter for Atmel AVR Microcontrollers - A simple circuit to program almost any Atmel AVR microcontroller in-circuit.__ SiliconChip
Intelligent NiCad Battery Charger - "Connect and Forget" unit fast charges 702-14.4V battery packs from power tools and model cars. A PIC processor simplifies the circuit.__ SiliconChip
Intelligent 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. __ Designed by Luhan Monat-Mesa Arizona
Interface Cable for Casio Qv-200 Digital Camera - Lose your cable? Build it yourself and save $29. Fits many QV models __ Designed by Bob Blick
Interfacing PC Sound Card to SSB Rig - AN047-P: InterfaceLVDS: Interfacing LVDS to PECL; LVPECL; CML; RS-4422 ans Signal-ended Devices
Interfacing Sony Control Stick to Empeg - After discovering that others had interfaced wired remote controls to their Empegs (including Sony control sticks) I decided to try to do it with the fewest components possible. You may find that there are too few, if your power is very noisy (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before and/or after the voltage regulator. At the moment I'm not using these but at this point I've only tested it on the bench, not in the car. I'll update this web page after it's all installed. __ Designed by charlie @ armory.com
Interfacing the PIC16c508 - Each of the output lines of a '508A microcontroller can deliver a maximum of 25mA.
What does this mean? It means any device connected to the line must take 25mA or less. If it takes more than 25mA a buffer transistor (also called an amplifying transistor) must be used and this will be discussed in a moment.
However, if it operates on less than 5v, and requires less than 25mA, a current-limiting resistor must be included. __ Designed by Prepared Colin Mitchell
Intrusion Detector-Video - This device uses a PIC16F819 and an LM339 to detect motion on a video signal. The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data. __ Designed by Luhan Monat, Mesa, AZ
IR Detector for Robot - How to build a simple IR detector, schematics and alternate links __ Designed by DC Reagan
IR Digital Thermostat for FAN - This circuit measures temperature in Celsius scale and displays it on an alphanumeric LCD screen When temperature rise to 40 C an alarm is activated and at the same time a relay is also activated which drives a fan to keep the temperature at a level __ Contact: IQ Technologies
IR Security - PIC Project This unit uses one TSAL6100 IR/LED emitter from Digi-Key. This IR diode has a narrow (10 degree) radiation pattern at 940 NM. It is driven via 2n2904 transistor for maximum current pulses. The detector is a Vishay TSOP4838 38Khz integrated receiver module. The 38Khz signal for the emitter is generated in software. __ Designed by Luhan Monat, Mesa, AZ
IR Terminal, Remote - 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 __ Designed by Luhan Monat, Mesa, AZ
IrDA Interface Board for the DSP Musicolour - Most PCs and laptops now offer an IrDA interface to enable communication without any physical connection. Now you can have the same facility for the DSP Musicolouror for virtually any other microcontroller project.__ SiliconChip
Isolated High-Current Adaptor for Scopes & DMMs - If you want to measure and monitor mains current of up to 30A using your DMM or scope, this is the safe and easy solution. It works just as well with DC and it has significantly better resolution and bandwidth than most clamp meters.__ SiliconChip
Isolated Probe - PIC Project Working on live telephone circuits can be a problem. You just can't connect a normal scope probe to the circuit while it is tied to the phone line __ Designed by Luhan Monat, Mesa, AZ
Iterated-map creates chaos - EDN-Design Ideas 07/13/2016 The chaotic circuit in This Design Idea can generate random numbers, demonstrate chaotic behaviour, and impress friends and colleagues Design by Lars Keuninckx
Java applet computes standard values - 08/17/98 EDN-Design Ideas NOTE
: File has several circuits, scroll to this one. The Java applet in Listing 1 implements a standard-resistor value calculator in a form that is suitable for use on a Web page or an internal intranet. Java solves the portability and platform-support problems of previously published Basic programs. See Reference 1 to learn Design by Vance Campbell, Digital Radio Communications Corp, American Fork, UT
Jazzy Heart Electronic Jewellery - Want to be the life of the party? Build the Jazzy Heart LED display!__ SiliconChip
Keyboard to Ascii Decoder - Host to Keyboard Protocol is initiated by takingKBD data line low. However to preventkeyboard from sending data atsame Time that you attempt to sendkeyboard data, it is common to takeKBD Clock line low for more than 60us. This is more than one bit length. nKBD data line is taken low, whileKBD clock line is released __ Designed by Craig Peacock
Keypad engine immobiliser - There's no need for a hidden "kill" switch.__ SiliconChip
Key-Reading Saves I/O Pins - 6-Mar-03 EDN-Design Ideas Amplifiers perform precision divide-by-2 circuitSome 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 yieldfree 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] Design by Gustavo Santaolalla, Digital Precision Systems, Buenos Aires, Argentina
Knock Detector for the Programmable Ignition - The Programmable Ignition System would not be complete without the addition of engine knock sensing. This Knock Detector is useful for adjusting ignition timing maps and can also automatically retard the ignition timing if engine knock is detected.__ SiliconChip
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