Diode Detector

need supplies for wireless telegraph!?!?

i need an antenna, an electromagnetic buzzer, and a detector diode, preferably a 1N400, and all under $20. i know where i could get and antenna, but i can't find the buzzer or the detector diode. when i do, it's for the uk. any suggestions would be great. thanks!

You will need more than an antenna and detector to drive a buzzer. You need to amplify the signal, then drive the buzzer from the output.
1N400 series diodes are available at any electronics parts stores.
1N4001 1N4002 etc. But if you want a detector, a germanium diode will do the job better, as the voltages are very small. Try OA91.
Piezo buzzers are also available from electronics stores. The piezo types are more suitable than electromechanical ones.
An antenna can be a length of copper wire.
Where are the telegraph "signals" coming from?
But perhaps you don't really mean "wireless"? Maybe a wire connected system? In which case, you don't need a diode.. just a buzzer.

Mastercool MSC55500UV Heated Diode Electronic Leak Detector with Uv Light $321.08 Features and Benefits. Digital micro processor controlled Heated Diode leak detector. Includes complete 10 application UV kit. UV light incorporated on tip of leak detector. Operating temperature 32Fnbsp; to 125F. 3 year 1 year over the counter warranty.nbsp; Lifetime warranty on heated sensorThe heated diode electronic leak detector has a flexible 15 probe and a patented UV blue light built into the tip allowing dual UV and electronic leak detection.nbsp; This unit also includes an additional 5 flexible probe adapter for leak detection in smaller diameter areas.nbsp; There are six sensitivity levels automatic warmup and a reset function.nbsp; It includes rechargeable NiMH battery that last for 8 hours of use and a 10 application UV dye kit with dye dye applicator UV glasses hose fittings and service labels.

Mastercool Heated Diode Electronic Leak Detector with UV light and 10 Application Dye Kit. Each $237.37 Manufacturer: Mastercool. Each. Features and Benefits Digital micro processor controlled Heated Diode leak detector Includes complete 10 application UV kit UV light incorporated on tip of leak detector Operating temperature 32F to 125F 3 year, 1 year ove

A/C Refrigerant Leak Detector $419.95 ? Detects all CFC, HCFC and HFC refrigerants ? Pinpoints both small and large leaks ? Easy to use visual sensor calibration system ? Positive ion-emission heated-diode sensing element ? Powered by the 12V rechargeable battery, AC or DC external powered ? Accuracy exceeds J1627 ? Probe length: 4.5 feet ? 5 year manufacturer's warranty By Bacharach.

Tru Pointe Refrigerant Leak Detector $289.95 Bacharach's newest hand held refrigerant leak detector designed specifically for technicians looking for an easy to use, reliable and inexpensive leak detector that can quickly and accurately mark any leak spot. The Tru Pointe is designed to be instantly responsive to all refrigerants. It is even accurate when used in environments where high levels of refrigerant vapors are present. No manual sensitivity adjustments are necessary during the inspection process. Simply turn the unit on, and let it mark the spot!. The Tru Pointe is suitable for HVAC Service Technicians, Refrigerant Service Technicians, Plant Maintenance Departments, Automotive Service Facilities, and Refrigerant & Environmental Chamber Manufactures who are in need of a small, lightweight and rugged instrument that is capable of detecting and then pinpointing small to large refrigerant leaks in tight spaces such as those found in refrigeration units and automobile engine compartments. Features: ? Detects all CFC, HFC, and HCFC refrigerants ? Patented Heated Diode Sensor Technology ? Instantaneous response time ? Innovative sensor replacement design ? Battery-powered with low battery indication ? Long-life, DC brushless fan ? High and low-sensitivity modes ? Automatic zero and background compensation ? Audible & visual leak detection ? Easy to use, one-handed operation ? No user calibration requiredBy Bacharach.

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CPS Products The Eliminator? - Electronic Refrigerant Leak Detector $258.95 Fully automatic electronic refrigerant leak detector for all HFC, HCFC, CFC, SF6 gasses & blends. Exclusive POWERSHIFT software automatically monitors, controls & adjusts all critical instrument settings to ensure maximum leak search results under any job environment. Two separate visual LED displays enables user to pinpoint the exact location of leak source & the approximate size of that leak.Features:SENSOR TYPE - Cold Cathode Diode: Patented design allows fast, accurate detection of refrigerant leaks maintaining maximum sensitivity throughout the life of the sensor.Highly resistant to background contaminants including heavy condensation, oils, leak solutions, brake oils, radiator coolants, washer fluids, etc.SENSITIVITY - Fully automatic selection allowing detection of a 0.25oz/yr (7g/yr) leak rate of HFC.LEAK INDICATION - Audible Alarms: Two user-selectable audible alarm option (HIGH and LOW intensity)TACHOMETER VISUAL DISPLAY - Tachometer-like bar graph display: Eight high intensity LEDsGEARSHIFT VISUAL DISPLAY - Arranged in a gearshift pattern, 7 LEDs indicate the current sensitivity range of the unit and subsequent leak sizeWARRANTY - 2 years excluding sensors and batteries

Informant-2 Refrigerant And Combustible Gas Electronic Leak Detector $384.95 The Informant 2 leak detector allows pinpoint detection of either refrigerant or combustible gas leaks with the same instrument. Its unique combination of state-of-the-art patented sensor technology, advanced software design and microprocessor controlled circuitry offers you unmatched precision coupled with tremendous speed. It is unquestionably the fastest, most sensitive, most reliable, most accurate leak detector on the market today. Swap sensor tips within seconds and never worry about adjusting sensitivity levels?it?s taken care of automatically?even where high levels of background vapors or refrigerants are present. The refrigerant sensor tip is finely tapered to 0.2 inch diameter, so you can get in between coils and fittings, gaining access to hard to reach areas. The Informant 2 leak detector features an audible indicator with a mute option coupled with sequential LEDs to monitor increasing concentrations of refrigerant or combustible gases. Features and Benefits: One instrument?two functions Lightweight and ergonomically designed Swap sensor tips in seconds Microprocessor controlled for accuracy and reliability Sensitivity is automatically adjusted Sensors are the industry?s most responsive Hydrophobic filter prevents moisture contamination Optional rubber boot holds flashlight Sequential flashing probe tip, dual LED displays and loud tick rate indicates relative concentration levels Detects all halogens and all combustibles Response time is two-tenths of a second Probe length adjustable from 3'' to 20'' Specifications: Sensing Elements: Refrigerant - Heated Diode, U.S. Patent No. 5,932,176 Combustibles - Patented semiconductor type, 5 year typical life, plug-in replacement Refrigerants Detected - All CFC, HCFC and HFC refrigerants including: R-12, R-22, R-123, R-134a and blends R-404A, R-408A, R-409A and R-410A (i.e., any refrigerant containing Chlorine, Fluorine or Bromine gas) Combustible Gases Detected - All combustible gases and vapors Alarm Sensitivity: Refrigerant - 0.25 oz/year of R134a (hardest to detect refrigerant) Combustibles - Minimum 50 PPM (Methane) Alarm Types - Audible and dual visual LEDs Power Source - Four AA disposable alkaline batteries included Warm-up Time - 10 seconds Response Time: 0.2 second Battery Life: 4 to 5 hours, under typical intermittent operation. Probe: 20'' (50.8 cm) maximum length, fully extended; 3'' (7.62 cm) if wrapped around instrument. Includes LED indicator Size: 1.75''W (4.44cm) x 9.62''L (24.43cm) x 2.25''H (5.72 cm) Weight: 0.86 lbs. (0.39 kg) with batteries Agency Approvals: Refrigerant UL listed in accordance with SAE J1627 Combustible MET Lab certified to UL 913, intrinsically safe for use in Class I, Division 1, Group D hazardous areas. By Bacharach.

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10.25 GHz Gunn Diode Transceiver, Part 2

An Introduction To Barcode Equipment

A complete barcode system will consist of software, scanners, a printer or labeler and labels for thermo transfer or thermo direct printing. Also of interest are mobile terminals for mobile data acquisition with a built-in scanner or reader, a display and a keyboard. A POS (point of sale) solution will require laser barcode scanners with high throughput and automatic triggering for hands-free barcode scanning.

Barcode Software

Barcodes are created with special software. While barcode software for Microsoft Windows is available, best suited for barcode creation are Apple Macintosh computers. Macs are preferable due to their strong position in the DTP, prepress and graphics market segment. A typical barcode software will support the common symbologies, calculate checksums automatically and will provide a variety of output options with support for the most common images formats (like PNG, TIFF or JPG) and also for Post Script or EPS.

A cheap alternative to dedicated barcode generators are so called barcode fonts. However, the quality a barcode created with such a font will usually not conform to the respective standards.

Depending on the application the use of dedicated, barcode enabled, label printing software may be advised. For example, such software can be used to print sequential barcodes (for serial numbers) or print logos or product images next to the actual barcode.

Barcode Scanner

Barcode Scanners, also known as barcode readers exist in various forms: The most common type are laser scanners. Here a moving laser beam scans the code which results in fast and error free reading. A cheap alternative to laser scanners are CCD scanners that feature a row of light emitting diodes and photo detectors. The earliest type of barcode reader where so called barcode wands, also known a magic wands. Here a single light emitting diode (LED) and a single photo detector are used to detect the typical black and white pattern of a barcode. While laser and CCD barcode scanners scan a barcode as a whole the barcode wand has to be swiped across the code to read it.

Barcode Printers

Barcode printers are used to print the barcode on self adhesive labels. Today most barcode label printers work in either thermo direct or thermo transfer mode. Using the thermo direct principle the print head applies heat to selected parts of the label which then turn dark. This is the same principle as is used with older fax machines. Thermo direct labels are sensitive to light and should not be used if they have to last longer than a few days or weeks. Typical applications are address labels which only have to last a few days.

With thermo transfer printers a heat sensitive ribbon (thermo transfer ribbon) sits between the print head and the label. As heat is applied to the ribbon, ink transfers (hence the name) from the ribbon to the label. Labels that were printed with thermo transfer are very durable. However, besides the actual label the transfer ribbon is another consumable which will increase the printing cost.

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Article from FOLD.COM - The Barcode Authority.