Audio Amplifier Speech Understandabilility
2009-08-31 03:01:00 Has anyone tried to make an audio amplifier which produces more speech understandability. Like those audio amplifiers used in hearing aids, they amplify, but to us millions who are hard-of-hearing (hoh), the understandability is downright poor. Hearing-aid manufacturers do a tremendous amount
Loud N Clear Sound Amplifier
2009-04-08 04:43:00 Loud N Clear The Loud ‘N Clear listening device is a compact personal sound amplifier cleverly designed to look like a cell phone headset. The compact portable amplifier is a hearing device that fits comfortably around your ear. You can use it anywhere to listen to low-volume sounds clearly. Your personal amplifier allows you to hear clearly without disturbing those around you. Turn up your Volume with Loud N Clear Loud N Clear – The Personal Sound AmplifierGet Extraordinary Hearing with Loud N ClearLoud and Clear is the personal sound amplifier that lets you turn the volume up for yourself, without disturbing anyone else. It’s great for watching TV, hunting, nature walks, sporting events, keeping an ear on children, and more!  Watch Loud N Clear Infomercial - As Seen On TV
Programmable Gain Amplifier (PGA) Software
2009-03-30 14:59:00 Hi, I would like to amplify my 0.65 volt sine wave and square wave output from AD9833 to 10 Volts. I need to control the amplitude using software. The bandwidth of the signal is from DC to 2 Mhz. It should amplify atleast signals from DC to 2 Mhz. Could you please help me finding such an am
Sony Amplifier and Schematics
2009-03-03 15:29:00 I have a Sony Amp that was working fine until one day it kicked into this Protector mode. I bought the schematics for it. I'm trying to figuire out which component is the problem and was looking for some help. I have a Fluke 189 and a Textronic 4CH digital storage scope. Any help would be apprec
NEW DECWARE AMPLIFIER for 2009 !
2008-12-31 06:11:00 The new Mini Torii SE amplifier is now completed and going into production! We think the emotional attachment to this amplifier is going to be unusually high. MORE INFO [[ This is a content summary only. Visit my website for full links, other content, and more! ]]
FM RF Amplifier 88-108 MHz 100mW-8W
2008-12-29 01:10:00 Here's FM RF amplifier 100mW-8W for 88-108 MHz. This amplifier circuit using the transistor BFR96 and 2SC1971 and equipped with a low pass filter Click link for more: Schematic Photo View Parts List Silkscreen Copper bottom Component layout
Eclipse XA5000 Class D Amplifier
2008-08-30 11:13:00 CircuitCity.com has the Eclipse XA5000 Class D Amplifier for $288 after $280 instant discount and $32 coupon discount using coupon code RCA89JPACM at checkout (ends 8/30) w/ free shipping. The Eclipse XA5000 Class D Amplifier features: 5/4/3 channel amp, 50W x 4 plus bass channel, Class D amp, ICEpower, Output terminals, LED indicators.
500W Multi-use VHF Power Amplifier Up to 500 MHz
2008-08-30 03:10:00 This circuit is 500 watt Multi-use VHF Power Amplifier for frequency up to 500 MHz. This amplifier module incorporates microstrip technology and a single BLF369 mosfet transistor. Input/Output 50 ohms and Power out 500W minimum with a 3 to 5 watt input. Power Supply requirements 22.5 Amperes 32 volts. Schematic Circuit Here's the simple schematic circuit VHF power amplifier. Click image for enlarge schematic. Printed Circuit Board and Layout Below power amplifier PCB and component layout. For more info about power amplifer transistor click download link below: Download BLF369 Datasheet for Parts List
DUPVA-1-70 amplifier
2008-08-10 07:32:00 Hi Is any one ready to design voltage performance with flat response up to 1GHz and flat gain 1kHz to 1GHz of 70db and noise down to 1.9db ? DUPVA are from FAST Comtec www.famto.de I will like to buy such amplifiers if some one can make them cheap and with equivalent performance.
1KW Mosfet FM Amplifier Service and Operating Manual
2008-07-01 18:08:00 High gain MOSFET transistors and systematic use of state-of-the-art manufacturing methods, have helped us to find effective solutions for the design of this new equipment. The amplifier, of simple and rugged construction, is able to satisfy the requests of all those end-users looking for top-quality equipment at reasonable prices. The RF power input is divided by 4 by means of a power splitter and is then connected to 4 x BLF278 MOSFETs.The power amplifier is lightweight with broad-band characteristics over the entire VHF FM range. The compact design and the internal configuration of the modules, allow excellent access to all components. All the power components are generously over-rated to ensure excellent reliability. The cooling system of the equipment makes possible to keep all components which dissipate heat, at low temperature figures, thus permitting reliability and very high MTBF.1 KW Power Amplifier Module The input power of the module is connected to a Wilkinson splitter, ...
A Video Amplifier For Satellite Receivers
2008-06-03 07:37:00 Almost all receivers have a built-in level controls which are adjusted by their manufacturer to give the correct output level for a standard satellite input signal. In some cases this control can be advanced far enough to lift ATV signals to the same output level but most receivers will need this design adding to assist them. There is a penalty to pay for winding an amplifiers gain up, given that the gain x bandwidth is a constant, the bandwidth is proportionately narrowed which results in poorer picture quality. Adding extra gain, such as this device does, will always be a better solution.By using a split and isolated supply, the input and output capacitors normally used in this kind of amplifier are eliminated. Bandwidth goes from DC up to more than 10MHz.The PCB is small enough to fit upright inside most satellite receivers. Connect "A" to the old video output point and use "C" or "D" as the new output point. The two outputs can be loaded simultaneously. VR1 sets the...
Adcom GFA-7705 200 x 5 Channel Home Theater Amplifier $1600 w/ free shippin
2008-05-16 18:41:00 J&R Computers has the Adcom GFA-7705 200 x 5 Channel Home Theater Amplifier for 00 after 9 instant discount w/ free shipping. The Adcom GFA-7705 200 x 5 Channel Home Theater Amplifier features: High Current, High Power Output Amplifier,5 Channel Output, Up to 300 Watts Per Channel. Source: Cheap Stingy Bargains Related posts No related ...
Car Stereo Amplifier Installation Basics By Chris H.
2008-05-15 04:46:00 A car stereo amplifier is a necessity if you take your car audio seriously. A car stereo amplifier is what helps determine the type of audio output your stereo will produce. If you have never experienced what a car amplifier can do, you will be blown away at the quality of sound that can be achieved. In fact, once you hear your favorite music played with the power of an amp, you will be instantly hooked.When you decide to purchase a car amplifier, one of your first decisions will be where to place it in your vehicle. You have several options but keep in mind an area where the amplifier will have the best air circulation. Common areas to install the amplifier include the trunk or under a seat. Also remember that the amplifier needs to be grounded so a metal surface to attach it to is key.Most people will have professionals install their car amps. If you are a do-it-yourselfer, the next step is deciding how to connect the amplifier to your car stereo. RCA cables are the common cable t...
Low Power RF Amplifier for 88-108 MHz
2008-05-11 20:46:00 This application use a common NPN RF transistor called 2SC1970. You can also use other transistors like 2N4427 and some others. Check datasheets to se how much power the transistor can handle. 2SC1970 will handle 1.3W and 2SC1971 up to 6W. Most transistor has a power gain of 10dB meaning 10 times power amplification.This is the reason why you must use several stages to achieve a strong transmitter. In this construction we are getting higher power then ever and you must be careful with the transistor. A 50 ohm dummy load MUST be used while testing, else the final transistor will break. An antenna can be used but the antenna must be properly made else the transistor will break.Hardware and SchematicIn all RF system and specially in RF amplifiers, it is very important to have a stable power supply and making sure you won't get any RF out on the power line. The Capacitor C12 and C13 will stabilise the DC power supply. L1, C10, C11 and L3 with C8, C9 will also prevent RF from leaking o...
WLAN High Linearity Power Amplifier
2008-05-11 20:14:00 The SST11LP12 is a high-power, high-gain power amplifier based on the highly-reliable InGaP/ GaAs HBT technology. The SST11LP12 can be easily configured for high-power, high-efficiency applications with superb power-added efficiency while operating over the entire 802.11a frequency band for U.S., European, and Japanese markets (4.9-5.8GHz). It typically provides 35 dB gain with 16% poweradded efficiency @ POUT = 23 dBm.The SST11LP12 has excellent linearity, typically ~4% added EVM at 21 dBm output power which is essential for 54 Mbps 802.11a operation while meeting 802.11a spectrum mask at 23+ dBm. SST11LP12 also has wide-range (>20 dB), temperature-stable (~1 dB over 85°C), singleended/differential power detectors which lower users’ cost on power control.The power amplifier IC also features easy board-level usage along with high-speed power-up/ down control. Ultralow reference current (total IREF 802.11a WLAN transmitter and access point applications. Figure 1The SST11LP12 is...
Car Stereo Amplifier Installation Basics
2008-05-01 07:20:00 A car stereo amplifier is a necessity if you take your car audio seriously. A car stereo amplifier is what helps determine the type of audio output your stereo will produce. If you have never experienced what a car amplifier can do, you will be blown away at the quality of sound that can be ...
By: MotorCarInfo.com
ballistic amplifier
2008-04-30 10:28:00 i wonder if anyone knew about that and where I could find more detailed information ?
NAD Amplifier failed Earth Continuity
2008-04-28 05:45:00 NAD Amplifier failed Earth Continuity test
By: Fixya.com
Audio Video Distribution Amplifier
2008-04-21 00:28:00 With the amount of equipment in home entertainment centers today the need to be able to vary the gain of the audio or video signal is needed. I found this particular circuit helpful when used in conjunction with the Universal Descrambler and a Stabilizer circuit I built for making copies of video tapes. It not only allowed me the ability to fine tune the video strength it also helped me increase the recorded audio which typically becomes poor when making tape copies.This circuit is an audio video distribution amplifier that splits to other channel for audio and video. Circuit operation is straight forward for amplifier circuits. The second channel for the audio amplifier is made up of the same components except the other half of IC1 is used. Pin 6 & 5 are inputs and 7 is the output.
30W UHF RF Power Amplifier For 440 MHz
2008-04-15 13:30:00 This Power Amplifier application works on UHF band frequency 440 Mhz and uses as UHF repeater power amplifier. Power amplifier out 30 watts (5 dB gain) use a single transistor 2SD1434 For driving the amplifier use 10-14 watt input with output power range 30-45 watts. Please see datasheet sample design for 470 MHz (SD1434.pdf) and Amplifier Application produced by Hamtronics.Other use of the power amplifier is for online covering broadcast (STL). If you use stereo encoder on exciter, so please use down converter with 340 MHz oscillator frequency direct to FM broadcast receiver.
Wilson?s new SignalBoost Pro Amplifier Kit wins at CTIA
2008-04-10 18:31:00 Wilson?s new SignalBoost Pro Amplifier Kit was honored at the CTIA Emerging Technology (E-Tech) 2008 Awards. In the Mobile Consumer Electronics - Fashion & Lifestyle division, the SignalBoost Pro earned 2nd place. Pictured here, the new SignalBoost Pro is a dual-band repeater which works with all carriers (except Nextel). It plugs into a USB port, which ...
Graham Slee Headphone Amplifier - give your iPod a boost
2008-04-10 13:41:00 Graham Slee Voyager - Give your iPod a high quality audio kick The incredible sounding Graham Slee Voyager iPod headphone amplifier is now available from the HiFi Headphones store. If you appreciate high quality audio and feel that listening to your iPod is a bit of compromise, then the Graham Slee Voyager is an ideal solution. ...
Fi-Hi Musical Bags
2008-04-08 05:28:00 Fi-Hi(www.fi-hi.com) presented its novelty bags equipped with speakers and amplifier during CTIA Wireless 2008. The Fi-Hi bags tout a built-in 3-watt stereo amplifier and water resistant speakers to listen to your favorite tracks without using headphones.
By: Top Blog Posts
High Impedance Voltage Amplifier Designs
2008-04-07 06:35:00 Friends, This thread is created for high impedance voltage amplifier designs. Idea is to sense and amplify small voltage over high impedance source having small capacitor to dynamically hold charge. Assuming that source impedance is 1G Ohms || 100 pF giving time constant of about 0
Electric guitar amplifier handbook (Paperback)
2008-04-01 06:04:00 Electric bass amplifier reference (Paperback)By Jack Darr 9 utilised and new from $65.00 Customer Rating: First tagged “guitar” by audiofreq Customer tags: guitar Technorati Tags: guitar
Magnetic amplifier repair
2008-03-31 15:52:00 Does anyone know of a shop that repairs cutler hammer magnetic amplifiers as in rewind or replacement?
CATV amplifier module BGX881
2008-03-30 17:55:00 DescriptionThis CATV amplifier module is a product of Philips Semiconductor, hybrid amplifier module CATV systems operating over frequency range of 40-860 MHz at a voltage supply of 24V DC with features :· Excellent linearity· Extremely low noise· Silicon nitride passivation· Rugged construction· Gold metallization ensures excellent reliability.This CATV Module can be used to amplify your CATV Modulator for 13 dB. And in my technical experiences in tv transmitter it can not only used on cable media, but also it can be used on air via a suitable antenna. With Adding a TV low pass filter you are able to transmit your video for 1 km.CircuitComponentsC1, C3, C4 ceramic multilayer capacitor 1nFC2 ceramic multilayer capacitor 1nF(max)R resistor 200 Ohm 1WPins 1 and 9 carry DC Voltages
14 Watts UHF TV RF Amplifier #2
2008-03-22 23:30:00 From #1 UHF TV RF amplifierBIAS CIRCUITComponent Part List:C1, C2, C4, C5, C6 = 1nF LCC Chip + 10nF LCC ChipC3 = 100µF SpragueC7 = 10µF SpragueD1 = 1N 4001L1, L2 = 5 Turns , Diameter 0.5 mm, W Diameter 3mmP1 = 1k.R1 = 56 ohm/ 1/2WR2 = 5600 ohm, 1/2WR3 = 2.2 ohm, 3WR4, R5 = 56 ohm, 1WR6 = 4,7 ohm, 1/2WT1 : BDX 54 B/BD139Previous Page ...
Phone Amplifier
2008-03-18 12:44:00 I am an EE but don't have any experience in audio circuits so I was hoping somebody could/would help. Here's what I'm looking to do, my dad has a large model train layout in his basement (about 85' by 30') and has 4 towns spread out with a central dispatchers office. We would like to set up a phon
Instrumentation Amplifier Handbook
2008-03-18 07:01:00 File : pdf, 1.75 MB, 116 pages TOC 1. INSTRUMENTATION AMPLIFIERS Overview 2. THE WHEATSTONE BRIDGE SENSOR Error Sources 3. AMPLIFIER TOPOLOGIES The Difference Amplifier The ?Classical? Three Op Amp Instrumentation Amplifier Internal vs. External Gain Setting Resistors The Two Op Amp Instrumentation Amplifier 4. AVOIDING INSTRUMENTATION AMPLIFIER PITFALLS Input Bias Current Effects Avoiding the ?Reference Pin? Trap A Common Mistake: Floating Inputs Common- Mode Voltage Limitations Calculating Common Mode Voltage ...
Appoaching to increasing gain of Low-Noise Microwave Amplifier Design
2008-03-17 11:42:00 Sir I, Devesh, M.Tech II-year, SVNIT Surat, wants to know how we can improve the gain of LNA without inceasing stages of amplifier. I am giving some details of LNA design. Thanks PERFORMANCE ANALYSIS 0F LOW NOISE MICROWAVE AMPLIFIER Abstract: The following pape
Increasing Gain of Low-Noise Microwave Amplifier Design
2008-03-17 11:42:00 Sir I, Devesh, M.Tech II-year, SVNIT Surat, wants to know how we can improve the gain of LNA without inceasing stages of amplifier. I am giving some details of LNA design. Thanks PERFORMANCE ANALYSIS 0F LOW NOISE MICROWAVE AMPLIFIER
1W Linear Power Amplifier 2.4 GHz
2008-03-12 22:54:00 The following single-stage transistor linear amplifier possesses a gain of approximately 7 dB and an output power of 1 W in the 13 cm band (approx. 2.4 GHz). It is thus suitable for use, for instance, together with the 13 cm transmit converter. This hybrid power mixer equipped with a varactor diode type BXY. This mean that the described power amplifier can provide linear output power in the order of 1 W.CIRCUIT DESCRIPTIONA transistor type F1E6 manufactured by CTC is used. In this case of this transistor, the emitter is internally connected to the cooling bolt. This ensures that there are no problems with respect to the high-frequency grounding of the emitter. The circuit diagram of this amplifier is given in figure 1. The matching of the transistor input and ouput impedance to 50 Ohm is made using standard method in (2) The circuit for adjusting and stabilizing the DC-operating point is similar to the method described in (3)CONSTRUCTIONDouble coated, epoxy glassfibre material is...
FM AMPLIFIER SD1407 150 Watts
2008-03-09 10:13:00 This FM amplifier is originally designed by Broadcast Warehouse, based transistor SD1407 with redrawn schematic and redesigned pcb. You can drive the amplifier with maximum 1 watt input for 150 watts FM output.Working frequency 88-108 MHz VHF band II, Power supply voltage 18-28 VDC.Download : schematic, PCB all layer, top layer, bottom layer. More info ...
3 W Broadband Amplifier For UHF TV Transposers
2008-03-07 18:03:00 A broadband linear amplifier design is presented, suitable for application in TV transposers, operating in band IV and V(470 - 860) MHz. The design is based on a BLW898 bipolar transistor. Typical results at the recommended class-A biaspoint (25 V/1.1 A) for the total module include a 3-tone IMD level of -64 dB (fvision = -8 dB, fsideband = -16 dB and fsound = -10 dB) and an average gain of 10.5 dB at 3 W peak-sync output power in the (470 - 860) MHz frequencyrange.The BLW898 is a bipolar linear power transistor designed to operate in the (470 - 860) MHz range. The transistor isencapsulated in a SOT171A 6-lead rectangular flange package with a ceramic cap. The specified output power is 3 W peak-sync in class-A. The intermodulation distortion level (IMD) 10 dB at 860 MHz.For application in TV transposers for Band IV/V (470 - 860) MHz a wideband linear power amplifier has been designedoperating in class-A. It is suitable for driving higher power stages in TV-transposers. (datasheet)
Uber Cool Gakken Self Build Vacuum Tube iPod Amplifier Kit - An Audiophile?
2008-03-05 13:02:00 As regular readers have no doubt gathered, we found fault with just about everything we featured yesterday primarily not because we were in a bit of a mood (though it has been known) but because nothing especially excited us but, thankfully, this simply fabulous and beautifully geeky Gakken Self Build Vacuum Tube iPod Amplifier Kit has served to resurrect us from our stupor, sending us running around the room in a thinly veiled dance of excitement like either a headless chicken or a complete idiot (yes, okay, it?s the latter).
TDA2005 2×20 Watt Stereo Amplifier
2008-03-03 18:05:00 TDA2005 2×20 Watt stereo amplifier description: This circuit is a small stereo amplifier for all suitable applications like amplifying small speakers, boxing, etc. It is also suitable for car use but before, the power supply must be choked with at least 150mH and it must give up to approximately 6 to 7 amps during the upstream ...
By: YourITronics
LM3886 2×68 Watt Amplifier Full Project
2008-03-03 18:01:00 LM3886 2×68 Watt amplifier Full Project description: In this application, we are building a gaincard like amplifier. This application type is named gainclone in Audio world. To take a satisfactory Audio response, we are adding a Linkwitz equaliser to the feedback line and adding bass compensation also. We are using LM3886 which is the revised ...
By: YourITronics
Update: Review on the Mysterious CMoy Pocket Amplifier
2008-02-25 19:20:00 Remember when we told you on the 18th February (see here) about a mystery device which can improve the quality of headphones? Well we can now enlighten you a tad further. The mysterious item is called the CMoy Pocket Amplifier which was designed by Chu Moy over at Headwise Forums. This design is for D-I-Y and ...
By: Phones Review
New mystery item is called Micro CMoy Amplifier, full low down review
2008-02-25 18:40:00 Not so long go Mobility Site said they was going to talk about a mystery item they had up their sleeve, and true to their word and as promised here it is. They said that the new mystery item would be able too improve the sound of your MP3 player and headphones, oh yes they will ...
By: Product Reviews
The Electric Guitar Amplifier: Inside and Out
2008-02-18 20:22:00 What We Do Know We all know that guitar amps offer loud and shockingly beautiful sounds that originate from our electric guitar of choice. What’s not always obvious, however, is exactly how the amplifiers work. But once again at Soundetta.com we’re here to explain the complicated workings of our favorite electronic equipment in terms that everyone can ...
BLV859 UHF Linear Push Pull Power Amplifier
2008-02-18 15:38:00 A broadband linear amplifier design is presented, suitable for application in TV transposers operating in band IV and V (470 to 860 MHz). The design is based on two BLV859 bipolar transistorscombined with quadrature hybrids. Typical results at the recommended class-A bias point (25.5 V/9.1 A) for the total module include 40 W peak sync output power at -54 dB three tone IMD level (fvision = -8 dB, fsound = -10 dB, fsideband = -16 dB) and an average gain of 10.5 dB in the (470 to 860) MHz range.The BLV859 is a bipolar linear push-pull power transistor designed to operate in the 460 to 860 MHz range. With a specified output power of 20 W peak-sync in class-A it is the largest device in the new generation of transposer transistors. The intermodulation distortion level is 10 dB at 860 MHz. For application in TV transposers for Band IV/V (470 to 860 MHz) a wideband linear power amplifier has been designed with two BLV859 transistors in class-A.The amplifier consists of 2 balanced circuits...
Marshall MG15DFX 15 Watt Electric Guitar Combo Amplifier with Effects
2008-02-17 06:02:00 Marshall MG15DFX 15 technologist Electric Guitar Combo Amplifier with EffectsBy Marshall Buy new: $229.00$249.004 utilised and new from $99.96 First tagged “guitar” by Bobmu37 “Bobmu37″ Customer tags: spider iii, line 6 amp, ...
Bike Stereo Speaker - MP3 amplifier with stereo speakers for your
bicycle
2008-02-13 05:42:00 With this stereo speaker amplifier, you can listen to music from your MP3 reader wherever you go - even while riding your bike! This great gadget means you don''t have to bother with wires and headsets - the Bike Stereo Speaker gives you freedom to enj...
An Classic Amplifier Re-born!
2008-02-11 02:19:00 Chassis for the new Zen amp were completed this week and I thought I’d give you a sneak peek! I hope to have time in the next week to finish the first unit. Then it’s on to the web site and people can start ordering again! Production stopped on the original grey Zen amp (model SE84C) ...
470 - 860 MHz Wideband Amplifier Construction
2008-02-09 15:51:00 INTRODUCTION In the application report NCO8101 two amplifiers for band 4/5 with BLV57 transistors have been described. Reactions on this report proved the necessity to give more information about the construction of these amplifiers. This construction has been based on a heatsink with a printed-circuit board at the upper side and the bias circuits and a forced air-cooling at the lower side. (download datasheet)PRINTED CIRCUIT BOARD In the printed-circuit board rectangular holes have been made to mount the BLV57 transistors on the heatsink. For fastening of the printed-circuit board on the heatsink by means of screws, 7 holes of 3.1 mm Æ and for fastening of the hybrid couplers 8 holes of 2.6 mm Æ have been made on the indicated places (see Figs 1 and 2). Hereby has been taken into account the use of Anaren hybrid couplers, type 10264 - 3, suited for the frequency range of 500 - 1000 MHz. Because the 2 bias units have been situated at the lower side of the heatsink, the connections ...
UHF TV RF Amplifier 470-860 MHz
2008-02-06 05:56:00 Working Frequency 470-860 Mhz UHF Band IV and V. Power out of the RF Amplifier about 14 Watts with power input 1.5 Watts. ( Transistor Datasheet)Schematic Part Lists :C1 = C6 = C16 = 4,7 pF (500 V) multilayer ceramic chip capacitorC2 = C3 = C20 = C21 = 33 pF multilayer ceramic chip capacitorC4 = C9 = C13 = C19 = 1,2 to 3,5 pF film dielectric trimmerC5 = C7 = C15 = C17 = 100 nF multilayer ceramic chip capacitorC8 = C10 = C11 = C12 = 220 pF multilayer ceramic chip capacitorC14 = C18 = 6,8 mF/40 V solid aluminium electrolytic capacitorC22 = C23 = 1 pF (500 V) multilayer ceramic chip capacitorL1 = L2 = L13 = L14 = Coax. 50 Ohm with diameter 2,2 mm; lenght 29,0 mm, soldered on striplines75 W (1,1 mm ´ 28,0 mm). inner L1 dan L13 not connectedL3 = L4 = 52 W stripline (2,0 mm ´ 16,5 mm)L5 = L8 = 470 nH microchokeL6 = L7 = 39 W stripline (3,1 mm ´ 8,0 mm)L9 = L12 = 1 Turn (1,0 mm); diameter 5,5 mm; lead space 2 ´ 3,5 mmL10 = L11 = 39 W stripline (3,1 mm ´ 34,0 mm)L3, L4, L6, L7, L10 dan L11 ...
100 Watts UHF Band IV-V TV Power Amplifier
2008-02-06 05:36:00 The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from band IV - V in UHF. (All Datasheets)Amplifier Circuit The total description of the amplifier is given in Figs 6 and 7 and Table 8 (in datasheet). The amplifiers input and output matching networks contain mixed microstrip-lumped elements networks to transform the terminal impedance levels to approx. 25 W balanced. The remaining transformation to 50 W unbalanced is obtained by 1 : 2 balun transformers. The baluns B1 and B2 are 25 W semi-rigid coax cables with an electrical length of 45° at midband and a diameter of 1.8 mm, soldered over the whole length on top of microstrip lines. To keep the circuit in balance two stubs L1 and L8 with the same length have been added. For low frequency stability enhancement the input balun stubs are connected to the bias point by means of 1 W series resistors. Large capacitors (C4 and C11) are added at the biasing points ... |
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