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Parametric & Graphic Eq's Plus Peaks & Notches - If you're into playing with tone controls and notch filters to see how they change the sound out of your effects, you will undoubtedly have built several glops of R's, C's and pots, maybe some L's to make up the tone networks. While this is fun, it's not very flexible. Sooner or later you might wonder if there is a more general solution to messing with tone controls. __ Designed by © 1999 R.G. Keen
Parked-Vehicle Highway Flasher - Often, at night, a speeding vehicle rams into another vehicle parked at the edge of a highway. Cars have parking flashers, but trucks, buses and loading rickshaws rarely have any form...__ Electronics Projects for You
Parking Lamp control - When you encounter to a traffic jam, the car may not go on for long time in idling condition. Although it depends on the car if you turn on the lighting devices in idling condition at night the electricity of the battery is having got gone. It is because there are many consumption currents of lighting devices etc. more the power generation volume of the dynamo. __ Designed by Seiichi Inoue
Part 1: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog - The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010
Part 2: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog - The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010
Passive filters fill the bill at audio frequencies - 02/01/01 EDN-Design Ideas Low-frequency filters, particularly at audio frequencies, usually take the form of active filters. These filters eliminate expensive inductors with windings of many turns. Both analog and digital active filters are most compatible with large-scale integration at the subsystem and system levels. Design by Richard Kurzrok, Queens Village, NY
PC Controlled Voltage or Current Source - If you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have. An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn't seems to involve that sickening crunch __ Contact: r dot p @ webone.com.au
PC Controls Inexpensive Waveform Generator - 6-Jun-96 EDN-Design Ideas The circuit in Figure 1 is a simple cost-effective waveform generator using PC control. You calculate the digital image of the desired waveform and store it in the 32k X 8-bit RAM(62256] through the 74HCT245 data buffer and the 16-bit local-address bus generator built with the 74LS393 binary counters Design by J Jayapandian, Indira Gandhi Centre for Atomic Research, Tamil Nadu, India
PC controls light dimmer - 08/19/99 EDN-Design Ideas Control one light dimming from PCUsing the simple circuit in Figure 1 , you can control the light intensity in your room or work area from your PC. The heart of the circuit is a low-power D/A converter that converts digital words from a computer's parallel port to analog-voltage signals. Design by Afshin Mellati
PC Infrared Remote Receiver - Build this simple unit and play DVDs and MP3s on your PC via remote control.__ SiliconChip
PC IR Remote Control - This page gives some information on a PC based IR remote control system I've developed for computer control of TV, video, satellite and hifi equipment etc. I have used an IBM compatible, so the software here is for such a machine, however I guess that it is straightforward (perhaps easier) to implement this on another type of machine __ Designed by Chris Dodge
PC or PICAXE interface for UHF remote control - Simple circuit lets you control the Oatley Electronics 4-Channel UHF Transmitter using a PC or PICAX__ SiliconChip
PC Parallel Port Output Capabilities - includes instructions how to connect a relay to PC parallel port __ Designed by Tomi Engdahl
PC Securely Controls Relay - 11/23/95 EDN-Design Ideas When a PC-driven solid-state or electromechanical relay controls external equipment, take care to design an interface that avoids false triggering. The interface circuit in Figure 1a switches the relay on and off only after a specific sequence of outputs. Thus, this design protects the relay against the influence of computer-reset and I/O operations that some drivers perform during system start-up to locate add-on cards Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of Technology Warsaw, Poland
PC Speaker Volume Control - This simple circuit can be used to control the volume of PC speaker. The volume can be adjusted to any value between total silence and full volume. __ Designed by Tomi Engdahl
PC Table Lamp - This useful circuit is built around well-known timer IC TLC555. It activates an electric bulb when your PC is switched ‘on’. When you shut down the PC, the lamp also automatically...__ Electronics Projects for You
PC Temperature Controller - Here is a simple temperature controller that turns your personnel computer (PC) off when the temperature of the PC increases beyond the optimal temperature value. Some of the larger integrated circuits...__ Electronics Projects for You
PC Temperture Alarm - This circuit uses a temperature sensor to detect the temperature inside the PC and generates an alarm if the temperature exceeds a pre-set limit. __ Electronics Projects for You
PCB Drill Speed Controller with 555 - Described here is a simple, inexpensive and useful circuit for electronics hobbyists. The circuit is nothing but a PCB drill speed controller, which can be used to control the speed of any 12VDC small pcb drilling units. Such portable units are now widely available, and even a hobbyist can make it without too much difficulty. __ Designed by T.K. Hareendran
PCB for Mark 5 IR Extender - The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much improved version of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light, daylight and other forms of interference. In addition it works with IR modulation freuencies in the range 30 to 120kHz making the Mk5 circuit the best choice for compatibility with remote controls __ Designed by Andy Collison
PC-Based DC Motor Speed Controller - This circuit allows you to control the speed of a DC motor (in eight levels) from your PC’s parallel port. The PC uses a software program to control the speed of...__ Electronics Projects for You
PC-Based Stepper Motor Controller - This stepper motor controller is perhaps the cheapest, smallest and simplest. A pair of H-bridges with a software program written in ‘C++’ is used to control the bipolar stepper motor with...__ Electronics Projects for You
PC-Based Wireless Control for Toy Car - Here we show how you can control a toy car through your PC’s serial port using a pair of ASK transmitter and receiver modules. The received signal is decoded by a...__ Electronics Projects for You
PC-Based Wireless Control for Toy Car - Here we show how you can control a toy car through your PC’s serial port using a pair of ASK transmitter and receiver modules. The received signal is decoded by a...__ Electronics Projects for You
Peak Power Tracking Buck Solar Charger Maximizes Efficiency - Solar panels are gaining acceptance as a practical means of electricity generation in remote locations, but despite improvements in the technology, solar panels remain expensive. Much of the expense is the panel itself, where the size, and thus cost, of the panel rises with required power output. Maximizing panel performance__ Linear Technology/Analog Devices App Note, Jun 15th 2010
Peak reading audio level meter - indicates peak audio response on an analogue meter, similar to a tape recorder recording level meter __ Designed by Andy Collison
Peltier Element Controls Itself - 10/27/94 EDN-Design Ideas Peltier elements, or semiconductor heat pumps, combined with heat sinks are a designer's choice when controlled low temperature is required for CCDs and high-density ICs. These devices are suitable for device temperature cycling in reliability tests Design by Dmitrii Loukianov, Moscow, Russia
Perimeter Monitor - Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in that area. The cable can be buried in a hosepipe or duct and is concealed out of sight. The mic is an ordinary dynamic mic insert __ Designed by Andy Collison
Phase Angle Control Of SCR using AT89c51 - Silicon-controlled rectifiers (SCR) are solidstate semiconductor devices that are usually used in power switching circuits. SCR controls the output signal by switching it ‘on’ or ‘off,’ thereby controlling the power to...__ Electronics Projects for You
Phone Light Flasher - This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit came from [url]http://www. hut. fi/Misc/Electronics/circuits/telephone_ringer. html[/url]. Notes: 1. You may need to use a lower voltage zener for D1 and D2.2. You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.3. Be very sure that you have not accidentally connected 120V to the phone line when building and installing this __ Designed by Aaron Cake
Phorism with 12V - Circuit Only + PCB __ Contact: IQ Technologies
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