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Diode Amplifier Circuit
while designing a receiver circuit for an optical fibre system,why is the ratio R1/R2 significant?
the receiver circuit has an amplifier TL081 connected with a diode SF2030.The resistors R1 and R2 are connected to this amplifier.load resistor value is between 1 to 10 Mohms.R1/R2 is the gain.why should it be high?
Output of photodiodes (between dark and bright) are typically in submili-volt range. Unless you are using APDs (Avalanche Photo Diodes) which has a much larger output voltage swing, you probably need to sacrifice some bandwidth (Opamps have finite Gain Bandwidth) in order to get any usable output.
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LightEmitting Diode $68.51 Light emitting diode. Oleg Losev, List of LED failure modes, Organic light emitting diode, Miniature light emitting diode, Solid state lighting, LED lamp, LED power sources, Electrical polarity of LEDs, LED circuit, LED as light sensor Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 74 Publication Date: 2009/10/08 Language: English Dimensions: 5.98 x 9.01 x 0.17 inches |
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Practical Audio Amplifier Circuit Projects $75.39 Practical Audio Amplifier Circuit Projects builds on the introduction to electronic circuits provided in Singmins innovative and successful first book, Beginning Electronics Through Projects. Both books draw on the authors many years of experience as electronics professional and as hobbyist. As a result, his project descriptions are lively, practical, and very clear. With this new volume, the reader can build relatively simple systems and achieve useable results quickly. The projects included here allow a hobbyist to build amplifier circuits, test them, and then put them into a system. Progress through a graduated series of learning activities culminates in unique devices that are nevertheless easy to build. Learn the basic building blocks of audio amplifier circuit design and then apply your knowledge to your own audio inventions. Targets the intermediate to advanced reader with challenging projects that teach important circuit theories and principlesProvides a ready source of audio circuits to professional audio engineersIncludes an electric guitar pacer project that lets you jam with your favorite band Author: Singmin, Andrew Binding Type: Paperback Number of Pages: 160 Publication Date: 1999/10/13 Language: English Dimensions: 9.21 x 6.02 x 0.33 inches |
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Amplifier $12.49 Amplifier |
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ZT Amplifiers Club 12 Guitar Combo Amplifier $549 The Club 12 is ZT Amplifiers' premium, stage-ready musical instrument amplifier. It offers a no-compromise output level and frequency range while remaining true to the ZT design spirit of compact and lightweight gear for the real world. Like all ZT products, the Club is simple and intuitive enough to allow anyone to plug and play without much effort. ZT Amplifiers Club 12 Guitar Combo Amplifier Features EFX Loop Plate Style Reverb Variable Headphone/DI Output Custom Ultra-High Performance 12 inch Speaker, Switchable External Speaker Output (8 ohms minimum) Aux Input on 1/8 inch Stereo Jack Voltage switch 115V/230V The Club is the amp that shows what ZT can accomplish without limits. With the Lunchbox, ZT proved that a tiny amp can hold its own on stage. Now we introduce a compact, lightweight 12 inch combo that can hold its own with anything. Sharing the same proprietary electronics design of the Lunchbox amp, the Club is capable of delivering 200 watts with output over 130dB at only 22 pounds and just a few inches bigger than the custom 12 inch driver inside. ZT Amplifiers Club 12 Guitar Combo Amplifier System Design 200w Class A/B Power Amplifier Ultra-low latency circuit for player responsiveness Pure analog front-end, with diode overdrive capability Proprietary dynamic tone shaping Vintage modeled tone stack Class A/B output stage with unregulated linear supply Sealed-box speaker tuning The Club 12 expands on the Lunchbox platform by featuring separate bass and treble controls, an effects loop, and a traditional reverb. The rock-solid enclosed cabinet reinforces the Club's serious, kick-you-in-the-chest low end. Highs and mids are detailed, with rich harmonics and an immediate attack that lets the player really connect with the amp. The Club is ZT with the gloves off. There is simply no stage it won't fill. ZT Amplifiers Club 12 Guitar Combo Amplifier Controls Volume Gain Treble Bass Reverb Line Out/Headphone Level |
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HP Audio Amplifier Circuit and DC Power Input Jack Board For IQ500 51892515 $34.22 HP Audio Amplifier Circuit and DC Power Input Jack Board For IQ500 51892515 |
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AudioPipe N5P200 200 Amplifier Line Circuit Breaker $29.95 200 Amp manual reset circuit breaker. 24 Kt. Gold Finish Screws. Perfect Fit for 4 Gauge Power Cable. Includes Collar Adapter for 8 Gauge Power Cable. Platinum Base is Precision Machined. |
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Circuit Analysis And Feedback Amplifier Theory $116.95 No Synopsis Available |
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ZT Amplifiers Lunchbox Guitar Combo Amplifier $299 The ultra-compact ZT Lunchbox amplifier has changed the way many players think about amps. The Lunchbox has proven that an amp does not need to be big to be loud, or expensive to sound great. That you can actually gig with an amp that weighs less than 10 pounds. Doubters have become believers – The Lunchbox really delivers. ZT Amplifiers Lunchbox Combo Amplifier Features Ultra-low latency circuit for player responsiveness. Pure analog front-end, with diode overdrive capability. Proprietary dynamic tone shaping. Vintage modeled tone stack. Class A/B output stage with unregulated linear supply. Ultra-high performance speaker precisely matched and tuned to the closed box. Packing 200 watts of power, the Lunchbox has enough output for a jam or live gig, and world-class tone that has pros using it in the studio as well as onstage. Unlike any other amp close to its size, it has the muscle to handle any effects you throw in front of it, and the warmth and depth to sound great with single-coil pickups as well as humbuckers. The Lunchbox is a flexible and adaptable problem-solver in the hands of a musician. The Lunchbox is layered with responsive tone but powerful and seriously fun to play at the same time. Go ahead, plug in and see for yourself. Then, lift your jaw up off the floor, toss your Lunchbox in a backpack with some cords and pedals, and get out there and play! |
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Circuit $11.49 Circuit |
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Study of Laser Diode and Edfa $111.53 This book basically gives the over view about The properties of erbiumdoped fiber amplifier (EDFA) such as gain and noise figure have been studied. By determining the characteristics of the 980nm, 1480nm 1550nm laser sources and ASE (amplified spontaneous emission) at the output of the amplifier used to determine the gain and noise figure of EDFA. This model allows to follow the signal (1550nm), pump (980nm) and ASE as they propagate along the fiber and determine population inversion .The both forward and backward propagation ASE are important in determining the overall gain and noise figure. For the amplification of more than 80 channels the DWDM (Dense Wavelength Division Multiplexing) has required CBand (15251565)nm and LBand (15651610)nm EDFA.We show that a flat gain spectrum can be achieved in the range from 1565 to 1610 nm when the EDF length, pump power and pump configuration are appropriately chosen. Special care must be taken when selecting the EDF length. Author: Kumar, Pankaj/ Kumar, Chakresh/ Chack, Devendra Binding Type: Paperback Number of Pages: 68 Publication Date: 2011/06/19 Language: English Dimensions: 9.02 x 5.98 x 0.16 inches |
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MIC MMIC Amplifier and Oscillator Circuit Design $178.44 Author: Sweet, Allen A. Series Title: Artech House Microwave Library (Hardcover) Binding Type: Hardcover Number of Pages: 380 Publication Date: 1990/03/01 Language: English Dimensions: 9.39 x 6.35 x 1.12 inches |
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GN AT3M Headset Amplifier $64.93 01-0437 Field replaceable headset cord and a 90 degree bend to minimize space and position the controls for easy access Full range volume control Voice switching to further reduce background noise when the agent is not speaking FailSafe Compression ensures constant speaker output The circuit precisely intercepts acoustic spikes AT3M AT3M Headset Amplifier GN GN Store Nord A/S Headset Amplifier www.gnnetcom.com |
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PylePro PPG-460A Guitar Amplifier $59.99 1 Year 110 V AC 13" 150 W 16" 18.30 lb 220 V AC 30 W 9.75" Volume, Bass, Mid and Treble Controls Bass Expander Circuit 8" High Definition Speaker Heavy Duty Wood Construction Amplifier PPG-460A PPG-460A Guitar Amplifier Pyle Audio, Inc PylePro www.pyleaudio.com |
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Rocktron Velocity 300W Guitar Power Amplifier $369.99 This guitar power amplifier features up to 300 watts of power for loud, clear sound and definition controls for enhanced tone. The Reactance circuit replicates tube amplifier sound in a reliable solid state design. |
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Design of Operational Transconductance Amplifier $111.53 Operational Trans conductance Amplifier (OTA) is one of the most versatile and important circuit components in the analog and mixed signal circuit design. OTA is voltage control current source device. In this book, we are shows simple designing of schematic circuit and CMOS Layout of OTA and get parameters like gain margin, phase margin, slew rate, CMRR, Transient Time, Noise Spectral Density, PSRR, Power Dissipation and Power Consumption. Author: Thanki, Rohit M./ Sanghani, Hardik R./ Lamba, Prof R. K. Binding Type: Paperback Number of Pages: 64 Publication Date: 2011/07/21 Language: English Dimensions: 9.02 x 5.98 x 0.15 inches |
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XXX XTX1300 2 Channel 200 Watt Amplifier $47.57 2 Channel High Power Amplifier. Remote Turnon/ Turn/off Circuit. Variable Input Gain Control. Thermal and speaker short protection. Soft turnon circuit. LED power indicators. |
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Pyle Chopper PLA2260 Car Amplifier $157.99 1 Year 1.42" 10.63" 2 21" 4 kW Sub Sonic Filter Power Protection LED indicators Gold Plated RCA Inputs Outputs Slim Size Amplifier Design for Easy Installation Variable Hi/ Lo Electronic Crossover Network Variable Input Level (Gain) Control Variable Bass Boost Thermal/ Overload/ Short Circuit Protection Car Amplifier Chopper Chopper PLA2260 Car Amplifier PLA2260 Pyle Pyle Audio, Inc www.pyleaudio.com |
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Pyle Chopper PLA2230 Car Amplifier $109.99 1 Year 1.42" 10.63" 17" 2 3 kW Variable Hi/Lo Electronic Crossover Network Sub Sonic Filter Thermal / Overload / Short Circuit Protection Power Protection LED Indicators Variable Input Level (Gain) Control Variable Bass Boost Gold Plated RCA Inputs Outputs Slim Size Amplifier Design For Easy Installation Car Amplifier Chopper Chopper PLA2230 Car Amplifier PLA-2230 PLA2230 Pyle Pyle Audio, Inc www.pyleaudio.com |
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A Diode Amplifier Driven Loudspeaker
radio without power supply?
how to?????
Make a radio receiver **without using a power supply**. This can be done using an antenna coil, a tuning capacitor, a germanium diode that provides a low cut in voltage, and a high impedance headphone that won't load the circuit much. You can test your design with a high impedance headphone or an external amplifier with a high input impedance. If you wind your own antenna coil, you get additional credit. Your radio should be able to receive at least one station clearly.
This kind of radio is older than I am, and I'm well over 50 years of age. People were building these radios back in the 1920's and 30's.
Get a spool of #22, or 20 wire, 2 would be better. Take a Quaker Oats cylindrical box and close wind it from top to bottom with the wire. When I say close, I mean wire touching the wire next to it. The ends need to be held down with tape, glue, or hot glue. Wait until the glue dries before continuing. It's tedious, but the extra point will be worth it. You need at least 4 inches of free wire at the ends of the coil. Before you start all of this, get a piece of wood, 12 inches long, and at least 6 inches wide. A piece of 1x12 would be fine. Sand it smooth, and at least coat it with polyethylene. It'll help the project look nice, and give a firm foundation for everything. Connecting clips can be obtained from Radio Shack. Mount the coil on the board. Mount a variable capacitor at the edge of the board where the shaft can be easily turned. The vallue for this capacitor is going to be at least 365 pf. More than that would be okay, but not less. One wire from the coil connects to the frame of the capacitor. The other end of the coil connects to the rotor plates of the capacitor, as well as the antenna connection which needs to be a very long wire. 100 feet of wire for this antenna, and as high as possible would be great. At the antenna connection point of the coil and capacitor, connect the anode end of the diode. Connect one lead of the head phones to the Cathode end of the diode, and the other end to the frame, or ground side of the capacitor. Slowly turn the capacitor and listen for an AM radio signal. These radio receivers were used during WW2, and many other places where no power was available. I'm sure a Google search would turn up a schematic as would a search in at least the older Boy Scout radio merit badge books. Older being the 1950's to 1960's.
So far as the germanium diode is concerned, "cut in' really doesn't describe what the diode does. It rectifies the selected radio frequency into pulsating DC, which powers the head phones. Germanium is used because it has a conduction voltage of about 0.3 volts which makes it useful for this project. If you really want to "go for the gold", get a piece of lead ore (Galena). Connect it on one side to a conductive plate, this would be one side of the diode. The other side uses a fine piece of wire held in place and it's free end is used to find a conductive spot on the face of the ore which allows the radio signal to be rectified, and heard. That is the way it was done before diodes were invented, and there were no tube diodes available for signal detection. Good luck with the project, properly done, it will work. I have built one or two in my past.
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