The My Delta Pi webstore

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Electronic equipment for hobby and laboratory use

Welcome to this online store where you can buy hobby electronic construction kits or components for hobby electronics for a better prize than in the local stores, or find electronic components and building kits you do not find locally. Pleace click om a link to learn more or to buy. The presented products are only some of the products you can find by clicking at a link.

At the bottom of this page there is some information about resitsors, capacitators and inductors.

ELECTRONIC KITS AND COMPONENTS

By clicking at this link, you will find all types of electronic components for hobby use and for professional use in laboratories. You will find electronic sets that can be used to build a lot of sevices and circuits. There are kits for building or installing specific electronic devices like power supplies, wave and pulse generators, measure devices, detectors, alarms, light effect generators, radio resceivers and transmitters and a lot more.  You will also find specific components of every kind singly or in bulk.

Electronics Kits and components - please click here

You will find electronic components or material of every sort in bulk or single: NTE electronic parts, capasitators, dials, knobs, diodes, relays, resistors, potetiomenters, semiconductors of every kind, transistors, diodes, thyristors, speaker wires, trimmers, hook up wire, wire ties, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-48in, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-6in, Heat Shrinkable Tubing - Dual Wall Polyoefin w/Adhesive-3:1 Per Package-6in.

WEB HOSTING AND INTERNET SERVICES

There are many good web hosting services in the market, and many of them price their services at an affordable rate. They differ however according to what modalities that are including in the basic packages and how they are prizing extra modalities or finesses. They may also have restrictions on what types of web-sites they will host. Therefore it is necessary to look at more than just one web-host before one decides which to use. It is also wise not to lay all websites one owns at the same host of security reasons, because any-web host can experience a major brake-down, even the very best and most expensive ones. Through these banners you get into the offers of  four good web-hosts. Plese look at them and decide which of them you want to use for your special needs.

DIGITAL CAMERAS AND CAMCORDERS

CONSUMER ELECTRONICS AND ACCESSORIES

Consumer electronics: Computers, Televisions, DVD Players / Recorders, Home Audio / Video, MP3 Players / iPod Accessories, Satellite Radio, Headphones, Mobile Audio / Video, GPS / Navigation, Home Electronics, Telephones & Fax, Personal Electronics, Electronic Accessories

 

For customers in UK: All types of computer accessories, also all other types of consumer electronics, examples: Computers & Home Office RAM Office, Materials, Paper Smartcard Systems, Interface & Controller Cards, Digital Photography & Video Printers, Harddisk Drives, Graphic Cards, Cables, Hubs & Switches. Communication / Networking Drives, Burners Loudspeakers, Headsets Input Devices / Mice / Keyboards Monitors, Motherboards, Notebooks 2.5" Hard disk casing, DDR notebook memory, Notebook Accessories, PC Cabinets & Accessories, PDAs Blank Discs, Media Scanners, Memory Cards, USB Memory, Games & Games Consoles

 

Accessories for all types of laptop equipment from all brands and for all models for good prizes: Examples: Laptop Batteries, PDA Batteries, MP3 Batteries, Digital. Camera Batteries, Camcorder Batteries, Universal Batteries, AC Adapters, Car Adapters, Airplane Adapters, Universal. Adapters, Printer Power Supplies, Chargers. GPS Receivers, Sync Cords, Fiber Optic Cables, HDMI. Cables, DC-DC Plugs • RPTV Lamps, Projector Lamps, iPod Accessories, MP3 Accessories, PDA Accessories. And more.

 

 

INKJET CARTRIGES, MEMORY MEDIA AND PRINTER EQUIPMENT

123InkJets: Here you can find inkjet cartridges for  good prizes to most ink printers of most brands, examples: A Top , Addmaster, Addressease, Adler/Royal, Advanced Hi-Tech, Agfa, Aitell, Amstrad, Apollo, Apple, Asker Intl, B Top, BDT, Bezier, Brother, Bryce Office Systems, Business Sys, Intl, C Top, Calcomp, Canon, Casio, Chinon, Citizen, Colossal Graphics, Commodore, Compaq, Comtech, Comterm, Costar, Craig Assoc, D Top, Daewoo, Data General, Datamega and meny more.

You also find other accessories like: Laser toner, ribbons, solid ink, blank CD/DVD, scrapbooking and cables

 

 

SECURITY SOLUTIONS FOR YOUR COMPUTING

Panda Software security solutions - In this shop private persons and companies find all solutions for their computer and internet security needs, and guidelines for choosing the right product.

 

 

DETECTORS TO FIND METALLIC OBJECTS IN HIDDEN PLACES

Here is an example of many metal detectors available. By clicking at the link, you can read more about this product example, or you can search for many other metal detector models.

MD9100 The Weekender Metal Detector from Famous Trails All-Metal Mode detects all types of metal, Notch Mode eliminates certain metal objects Discrimination Mode displays metal types such as rings and US Coins on the console LCD displays depth of target, low battery alert, distinct tones indicating types of metals Includes headphone jack, waterproof search coil, and padded arm rest Requires two 9-volt batteries (not included)

MENU OF PRODUCT EXAMPLES

Internet and mobile telephone products

Power supply kits - please scroll down

Amplifier kits - please scroll down

Light organs, psychedelic lights and light effect sets - please scroll down

For measuring and analyzer set - please scroll down

Specific electronic equipment building or installation kits - please scroll down

Photo, camcorders, video cameras

Electronic transmitters and transmitter kits, please click here

General elctronic kits

Metal detectors

Alarm kits and security electronics

Desktop and notebook computers

MP3-players and devices with MP3 capabilities

INFORMATION RESOURCES

About semiconductor devices

About transmitters

Some important internet services presented

About digital cameras of all kinds

Product examples - Power supply and speed controller kits

1.5-24V/1.5A Dual Output Power Supply Kit Two modes of operation: "Symetrical", which provides two equal (+) and (-) outputs, and "Independent", which provides two independent (+) and (-) outputs. Voltage: 48 VAC C.T. @ 1.5 Amps. Heat sinks are included. Comes complete instructions, transformer and etched silk-screened circuit board.

0-30V/0-1.5A DC Regulated Power Supply Kit This is a very stable and regulated power supply for all your needs with a maximum output current adjustable from 2 ma to 1.5 Amps. Heat sink is included. Comes complete instructions, and etched silk-screened circuit board. Can be ordered assembled.

3-20V/300 mA DC Regulated Power Supply Kit Here is that perfect little power supply you need on your bench to replace batteries. It is variable from 3 to 20 VDC. Using a regulator (LM7805) it delivers voltage up to 300 mA. This make a very good regulated power supply for many applications. Build one for your bench today and stop looking all over for batteries to test circuits. Easy to build comes with complete intructions and diagrams. Can be purchased assembled.

2X25 Watt Hybrid Stereo Power Kit This is a very high quality power amplifer. It is designed for low-noise stereo power amplification. (A power amplifier always needs to be fed by a pre-amplifier.) It has volume and balance controls.

DC Motor Speed Controller Vary the speed of your DC motor with this inexpensive circuit. Gear boxes can be costly and series resistors may cause stalling. This circuit delivers the voltage to the motor with pulses and the speed is controlled via pulse width modulation (PWM).

Preamp - 2W Amplifier w/Microphone Pre-Amp Kit A universal audio amplifier with many applications. Includes a microphone jack. Microphone input sensitivity: 5 mV. Audio line input sensitivity: 150 mV / 47 k ohms Voltage: 9 - 14 VDC @ 300 mA. Comes with complete instructions and etched silk-screened circuit board. Can be ordered assembled.

Preamp - Universal Mono Preamplifier Kit This kit was designed to suit different audio-applications where an insufficient input signal is available.

Adjustable Timer with Hour/Minute Operation A truly versatile timer with Hour/Minute mode switch. Timing is adjustable from 1 second to 2 minutes (in Minute mode), or from 1 minute to 2 hours (in Hour mode). It comes with instructions on how to modify the timer for a longer duration (up to 24 hours). The relay handles loads up to 3A.

Variable Strobe Light Kit This excellent Strobe Light produces a very high intensity, white light for short durations. The speed of the flash rate can be varied from one or two per second to twelve or more per second. It comes with a quality 5-watt flashtube which can be used for many hours, even with continous use. This strobe can be converted to manual operation for use with camera equipment. It has many safety and special effects applications. Use it for 'stop motion effect' like old-time movies, etc. Easy to build and maintain. Comes with complete instructions, theory and schematic.

Party Strobe Kit You won't believe your eyes! Home parties look like the real thing. Strobes flashing to the music. Fun to build, fun to use. Order one today and be the hit. Portable. Take it to parties. Just turn on the music and plug it into any wall socket. Does not need to connect to the stereo.

Power Blaster Color Organ Kit Make Mood Magic With this deluxe color organ you get 5 controls, one master control and 1 for each of the 4 channels (High/Mid.High/Mid.Low/Low). Power it up and dazzle your friends with Psychodelic dancing blasting Lights. Be the hit of all the parties with your colored Musical Light Show. Mood is Everything! Quiet it down with the 5 adjustable controls for a gentle glimmering romantic mood maker. The light intensity, for each string, is controlled by the frequency and the loudness of the sound for each channel. You can connect this up to the finest stereos with total confidence that the lights will be in total control by the music. This can be used professionally as well as at home for great dance parties. This will be the best color organ you have ever built! It was designed by our color organ 'guru'. Build one today and it will last for years... Easy to build and maintain. Comes with complete instructions. Note: For the mic input use a crystal mic not a dynamic mic. A color organ is a device that makes a 'light show' from music. The channels are not strictly divided by frequency, there is a lot of cross-over to make it more interesting. David McDonald, the color organ guru that has designed all of our color organs, has tried thousands of designs and this is the best. A color organ is to be connected to an audio music source with lots of frequencies and then you adjust all the controls to give you the most interesting display of lights, depending on the type of music you are playing. Build one today and enjoy music in a whole new way!

Color Organ Display Kit Build a low-budget musical light show with this single channel color organ using a very sensitive SCR. Have fun at parties and during the holidays. Use a string of 5 to 7 1/2 Watt Christmas lights. The intensity of the lights depends on the volume of the music. Make them for your neighbors or store owners. Quick to build and maintain. Everybody will love the lights that blink to the music.

Telephone Line Analyzer Kit - Test Equipment Save money fixing your phones and lines yourself and make money doing it for your neighbors. A telephone line analyzer that provides fast indication of telephone line polarity, ring and line voltage levels,condition of the phone line from user's telephone to central telephone office - also can check basic telephone functions and condition of telephone line cord.

Large Display Digital Thermometer (Assembled) A digital thermometer with a large 2" high display that is visible from a distance. It includes two digits made up of 25 LEDs each plus a degree Celsius symbol (C). It is based on two Integrated Circuits: the 7107 voltmeter and the LM35Z temperature sensor. The circuit incorporates a built-in power supply with an AC/DC adapter jack. Supply voltage: 9V DC @ 200mA. Recommended power supply: Kit CK341V12 / UK341V12.

LED Message Display - LED Display Kit (Green) With this kit you can create your own message for personal advertisements. This Kit can be used for home, shop, car or truck... Many spectacular light effects on the message : scrolling, blinking, rolling, panning,... You have 12 self definable characters and 150 bright green LED's are supplied with the kit. You can also adjust the effect speed and vertical or horizontal position of the kit is possible. You can select between light effects or that your message is fixed on(selectable with a jumper).You can also synchronize different displays to create longer messages, or to create giant advertisements.

Photo-Electric Counter Kit This state-of-the-art Photoelectric Counter has many applications in business, industry and security. It can be used to count just about anything, from cartons on a conveyor belt, copies on a printer to people moving through a doorway. It is completely silent and has no moving parts. You can make money building these and selling them to stores and companies. Easy to build and maintain. Comes with complete instructions along with drilled and etched circuit board.

Telephone Kit (E-AK700) Build this high-tech, see-thru plastic telephone. Learn theory on how telephones work and then proudly show off your work with the transparent phone case. The set includes automatic redial, ringer turn off switch, 4 neon bulbs for visual indication of telephone working, and wall mounting cradle. The sectionalized construction and testing makes this fun and interesting project.

'Old Time' Crystal Radio Kit This little project is a sure interest grabber with students of electronics of any age! Recommended for Boy Scout Merit Badge and Cub Scout Activity for requirements. It does not require a great amount of skill, but a little application will produce a good basic radio receiver. Construction is fairly simple. This radio DOES NOT require batteries to operate; rather, it uses simple electrical principles to power itself. It does not include the Double Headset shown but does include a Crystal Earphone. Tuning is done by rubbing a piece of metal (large paper clip included in kit) across the coil of wire which is wrapped around a toilet paper tube. The best antenna for this radio is simply a really long wire, mounted as high above the ground as you can make it. Though sometimes just connecting the antenna lead to a bed spring can bring surprising results, especially in city areas, or close in to a transmitter station in the country.

Fiber Optics Technology Trainer Kit Learn to communicate at the speed of light. Fiber Optic gives you the edge on the communications systems of the future. Learn the basics of fiber optics data communications while you build this exciting kit. Comes complete with all of the necessary components, including PC board and fiber optics cable, also separate transmitter and receiver.

Motion Detector Kit This kit comes complete with all parts, PC board, case schematic, and extensive training manual. It also includes an infrared detector, 3 integrated circuits, 16 resistors, 8 capacitors, 2 diodes, a switch, a speaker, a battery snap and cabinet parts. You can learn the basics of motion detector technology and have fun building this simple project. This battery operated kit adds safety to your home and office(can be used as a Sentry, Burglar Alarm, Movement sensor). The block diagram includes, Power Supply, Infrared Detector, Operational Amplifers & Filters, and a Tone Generator. It has a very good manual explaining its operation and theory. It gives many application examples.

ABOUT SOME ELECTRONIC COMPONENTS

Resistors

A resistor is a two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in accordance with Ohm's law: The electrical resistance is equal to the voltage drop across the resistor divided by the current through the resistor. Resistors are used as part of electrical networks and electronic circuits.

One can use a multimeter or ohmmeter to test the values of a resistor.

Most axial resistors use a pattern of colored stripes to indicate resistance. Surface-mount ones are marked numerically. Cases are usually brown, blue, or green, though other colors are occasionally found such as dark red or dark gray.
 

Capasitors

A capacitor is an electrical device that can store energy in the electric field between a pair of closely-spaced conductors (called 'plates'). When voltage is applied to the capacitor, electric charges of equal magnitude, but opposite polarity, build up on each plate.

Capacitors are used in electrical circuits as energy-storage devices. They can also be used to differentiate between high-frequency and low-frequency signals and this makes them useful in electronic filters.

Capacitors are occasionally referred to as condensers. This is now considered an antiquated term.
 

The capacitor's capacitance (C) is a measure of the amount of charge (Q) stored on each plate for a given potential difference or voltage (V) which appears between the plates:


In SI units, a capacitor has a capacitance of one farad when one coulomb of charge is stored due to one volt applied potential difference across the plates. Since the farad is a very large unit, values of capacitors are usually expressed in microfarads (µF), nanofarads (nF), or picofarads (pF).

The capacitance is proportional to the surface area of the conducting plate and inversely proportional to the distance between the plates. It is also proportional to the permittivity of the dielectric (that is, non-conducting) substance that separates the plates.

The capacitance of a parallel-plate capacitor is given by:

where ε is the permittivity of the dielectric (see Dielectric constant), A is the area of the plates and d is the spacing between them.

In the diagram, the rotated molecules create an opposing electric field that partially cancels the field created by the plates, a process called dielectric polarization.
 

Inductors

An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms, but most forms contain a coiled conductor, and inductor may be called "coils".

Inductance (measured in henries) is an effect which results from the magnetic field that forms around a current carrying conductor. Electrical current through the conductor creates a magnetic flux proportional to the current. A change in this current creates a change in magnetic flux that, in turn, generates an electromotive force (emf) that acts to oppose this change in current. Inductance is a measure of the generated emf for a unit change in current. For example, an inductor with an inductance of 1 henry produces an emf of 1 V when the current through the inductor changes at the rate of 1 ampere per second. The number of turns, the area of each loop/turn, and what it is wrapped around affect the inductance. For example, the magnetic flux linking these turns can be increased by coiling the conductor around a material with a high permeability.
The energy (measured in joules, in SI) stored by an inductor is equal to the amount of work required to establish the current flowing through the inductor, and therefore the magnetic field. This is given by:
where L is inductance and I is the current flowing through the inductor.
Electrical current can be modeled by the hydraulic analogy. The inductor can be modeled by the flywheel effect of a turbine rotated by the flow. As can be demonstrated intuitively and mathematically, this mimics the behavior of an electrical inductor; voltage is proportional to the derivative of current with respect to time. Thus a rapid change in current will cause a big voltage spike. Likewise, in cases of a sudden interruption of water flow the turbine will generate a high pressure across the blockage, etc. Magnetic interactions such as in transformers are not usefully modeled hydraulically.

An inductor is usually constructed as a coil of conducting material, typically copper wire, wrapped around a core either of air or of ferromagnetic material. Core materials with a higher permeability than air confine the magnetic field closely to the inductor, thereby increasing the inductance. Inductors come in many shapes. Most are constructed as enamel coated wire wrapped around a ferrite bobbin with wire exposed on the outside, while some enclose the wire completely in ferrite and are called "shielded". Some inductors have an adjustable core, which enables changing of the inductance. Inductors used to block very high frequencies are sometimes made with a wire passing through a ferrite cylinder or bead.

Small inductors can be etched directly onto a printed circuit board by laying out the trace in a spiral pattern. Small value inductors can also be built on integrated circuits using the same processes that are used to make transistors. In these cases, aluminium interconnect is typically used as the conducting material. However, practical constraints make it far more common to use a circuit called a "gyrator" which uses a capacitor and active components to behave similarly to an inductor.
 

Electronic component color codes

Electronic components are coded with a color band code. The code indicates figures. The interpretation of the figures, differr between the different component types. For resistors the figure indicate ohm. For capacitators they indicate micropharad.. The scheme is simple: The first two numbers are the first two significant digits of the resistance value, the third is a multiplier, and the fourth is the tolerance of the value. Each color corresponds to a certain number, shown in the chart below. The tolerance for a 4-band resistor will be 2%, 5%, or 10%.

The Standard EIA Color Code Table per EIA-RS-279 is as follows:

Note: red to violet are the colors of the rainbow where red is low energy and violet is higher energy.

As an example, let us take a resistor which (read left to right) displays the colors yellow, violet, yellow, brown. We take the first two bands as the value, giving us 4, 7. Then the third band, another yellow, gives us the multiplier 10⁴. Our total value is then 47 x 10⁴ Ω, totalling 470,000 Ω or 470 kΩ. Our brown is then a tolerance of ±1%.

Compunents use specific values, which are determined by their tolerance. These values repeat for every exponent; 6.8, 68, 680, and so forth. This is useful because the digits, and hence the first two or three stripes, will always be similar patterns of colors, which make them easier to recognize.

(Most elemements in this article are taken from wikipedia.org, and as such the article is free to reuse.)