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Improve FET-based gain control - 12/06/01 EDN-Design Ideas One problemwith standard FET gain-control circuits is increased noise when you use the FET as a part of a resistive attenuator in series with an op amp. This configuration attenuates the signal before amplification; hence, it requires much higher gain bandwidth and better noise performance from the op amp Design by Ron Mancini, Texas Instruments, rmancini@ti/com
Improve On Temperature Measurement - 05/02/02 EDN-Design Ideas When current pulses with a stable IHIGH/ILOW ratio modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE for a bipolar transistor] is a linear function of the absolute (Kelvin] temperature, T. You can us Design by Alexander Bell, Infosoft International Inc, Rego Park, NY
Improved Pl Tone Decoder - A significant amount of interest has been generated since my last article on a PL tone board. Because of this interest I decided to improve on the old PL tone design. Figure 1 is an inexpensive PL tone generator with significantly improved performance. It has a much more stable tone frequency as well as the elimination of the loading problem on the output. The transistor used in the old circuit would cause the tone frequency to change at high levels. This month's circuit eliminates all those problems __ Designed by Radio Amateur Society of Norwich
Improved Speed Controller for Universal Motors - Use it to control the speed of circular saws, routers, jig saws, electrics drills and lawn edgers rated up to 1200W.__ SiliconChip
Improving Selectivity with IF AGC - After installing narrower ceramic IF filters in my Sony ST-S555ES tuner, adjacent-channel selectivity was 32 dB at the standard 45 dBf test level. But it fell to just 22.5 dB at 75 dBf. The problem was evident for signals on the air as well as with instruments. __ Designed by Brian Beezley K6STI
Incandescent Lamp Inrush Current Limiter - This circuit limits the large inrush current often associated with large incandescent lamps. With the components shown the current is limited to 1 amp, but it could be scaled to any desired current. . . Circuit by David A. Johnson P.E.-July, 2006
Increased power for LED Flasher - Power LEDs are becoming more popular these days. The DC input power to these devices ranges from 1 watt to 5 watts. Normal LEDs only receive about 0.05 watts. At this higher power, these devices can emit a lot of light . . . Hobby Circuit designed by David A. Johnson P.E.-August, 2008
Increasing output voltage & current range using series-connected isolated μModule converters - EDN-Design Ideas 10/02/2015 Stack isolated converters to increase output voltage Design by LTC Design Note
Induction Motor Conversion - This was a little project to convert a small induction motor to a permanent magnet windmill.
Industrial Timers - This is a plug-in module which converts 4QD-TEC's transistorised relay into an industrial type timer. __ Designed by Richard Torrens
Inexpensive LED Drives Flash & Beep - 06/05/97 EDN-Design Ideas Sometimes, you need an alarm that is both audible and visible in an application that's stingy with space, power, and budget. The circuit in Figure 1a is compact, efficient, and inexpensive. The F336HD flashing LED (part no.276-036 at Radio Shack) is a useful device. It operates directly from 5V and produces a consistent pulse of light at approximately 1 Hz without a time-constant capacitor. Design by Dennis Eichenberg, Parma Heights, OH
Inexpensive logic controls stepper Motor - EDN-Design Ideas March 26, 1998 [ NOTE
: File has multiple design, scroll for this one.] A number of sophisticated ICs for stepper-motor control are now available. However, the advanced features of these chips--self-clocking, high-current drive, and full-step, half-step, and direction control--are often unnecessary or remain unused. For a design that needs to control only the number of steps, drive speed, and direction, you can make a very simple and inexpensive driver using two low-level logic chips (Figure 1). Design by David Ellis, Ellis Lindauer, Pullman, WA
Infa-Red Remote Control - A simple one-channel remote control. It will trigger a relay upon press of a button. __ Designed by Aaron Cake
Infra Red Remote Control Extender This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room. __ Designed by Andy Collison
Infra Red Switch - This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be used. __ Designed by Andy Collison
Infra Red TV Extender - After building both my Mark 1 and Mark 2 circuits, Mr Bocquillon has made an improved version, which is working very well. His design is based is based on an active filter, centered at 37KHz modulating frequency and uses a photodiode and op-amp from Texas Instruments __ Designed by Guy Bocquillon 21-3-07
Infra Remote Control Tester - A simple IR receiver to facilitate in testing of Infra Red Remote Control handsets. __ Designed by Andy Collison
Infrared gate 2 - This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output wich can turn on a ventillator. The time period the output is turned on can be separately controlled by a second timer. __ Designed by Peter Jakab
Infrared Receiver for Sony Remotes - Infrared remote controls are using a 32-56 kHz modulated square wave for communication. These circuits are used to transmit a 1-4 kHz digital signal (OOK modulation) through infra light (this is the maximum attainable speed, 1000-4000 bits per sec). The transmitter oscillator runs with adjustable frequency in the 32-56kHz range, and is being turned ON/OFF with the modulating signal, a TTL voltage on the MOD input. On the receiver side a photodiode takes up the signal. The integrated circuit inside the chip is sensitive only around a specified frequency in the 32-56 kHz range. The output is the __ Designed by Peter Jakab
Infrared Remote Control - A simple one-channel remote control. It will trigger a relay upon press of a button. __ Designed by Aaron Cake
Infrared Remote Control - Above is the transmitter and the image below is the receiver: [img:95744c1b83]http://www. circuitdb. com/download. php?fileID=197[/img:95744c1b83] To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. You can increase range by using a high output LED for LED1. Bright light will stop the receiver from responding to the transmitter
Infrared Remote Control - This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared receiver module (MOD) , part number 276-137. It is also. __ Designed by Randy Linscott
Infrared Remote Control - This article will show you how to use the components in our infrared data communications parts KIT. __ Designed by Reynold's Elec
Infra-Red Remote Control Extender - Miscellaneous: This is a battery powered Infra-Red Link that will allow you to change channels on your Satellite Receiver and operate the controls on your VCR & DVD from anywhere in the house. __ Designed by Ron J.
Infrared remote control receiver - You can control now your media center with this programmable RC5 receiver. Moreover, you can switch On/Off your Media Center by your remote control __ Designed by © Vassilis Serasidis
Infrared Remote Control Tester - Using a battery, a phototransistor and a visible-light LED, this simple circuit is a go/no go tester for IR remote control devices. The illumination of the LED indicates that Q1 is being modulated by IR energy.
Infrared remote control tester - This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room __ Designed by © 2005 Laboratory of Electronics
Infrared Remote Control Tester - A simple IR receiver to facilitate in testing of Infra Red Remote Control handsets. __ Designed by Andy Collison
Infrared Remote Control Timer - The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig.1 shows the IR transmitter section. The astable multivibrator NE555 (IC1) is used to generate a 10kHz...__ Electronics Projects for You
Infrared Remote Controller - The transmitter is built around two CMOS
555 timer ICs (TLC 555s). The transmitter generates a modulated 35-kHz IR signal. The 35-kHz carrier frequency is generated by IC2, and the 1 500-Hz modulating signal is generated by IC1. The output of IC2 drives LED1 through resistor R5; that LED provides __ Designed by Nicola AsuniTecnick.com
Infrared Remote Extender Circuit - This circuit is designed to be placed directly in front of a standard TV or VCR remote. The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Infrared Remote Extender for IR remote controlled equipment - This simple device lets you operate your CD/DVD player, set-top box (even the newest ones!), VCR or other program source using its remote control from another room in the house. It receives the signal from the remote control and relays this to the other room via a 2-wire cable. An infrared LED then retransmits the signal to your remote controlled equipment.__ SiliconChip
Infrared Remote Home Control - IR Remote Control for controlling home appliances can be easily made using Decade Counter CD4017, 555 Timer and TSOP1738 infrared receiver. By using this circuit you can easily control your home appliances using your TV, DVD Player remote control or using a remote control circuit described here. __ Designed by Abhay Bajpai
Infrared Remote Jammer - Don't like your little brother's TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone?This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that confuses the reciever by corrupting the data stream __ Designed by Aaron Cake
Infrared Remote Volume Control - This is a true 'minimalist' remote, having but three functions: Volume Up, Volume Down and Mute Volume is controlled by a motorized (motorized for US readers) pot rather than any of the 'digital' pots that now abound, and this was done for a number of very good reasons.
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