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1000 Threads found on Audio Transformer
audio transformers are really difficult to build unless you really know what you are doing, i really recomend you try to find one that fits your needs in a specialised store or website
What are the meanings of the following spec.? audio transformer ( 200K to 1K CT Input)
There are several unique characteristics. One is the frequency range is the audio frequency range. Another rating is impedance of source and load. The power is rated instead of voltages or currents.
wht is the role of an audio transformer as compared to a normal transformer...........????where are they used??? how does it function??
To achieve high dynamic, an audio transformer needs a magnetic shield, typically a box made of a high permeability material, e.g. "?-metal". If your device hasn't an effective shield, it can't be used in an enviroment of interfering AC magnetic fields. The most severe problem are mains transformers, but I guess pulsating ground currents (...)
30 years and older audio equipment used them. A portable transistor radio/tape player from that age may have the driver and the output audio transformers. Bigger ones on tube audio equipment. But depending what you want to do with it, a plain power transformer can be used.
hi guys i have a question for a replacement component cause i had hard time finding it, the component i am talking about is an audio output transformer, It consists of an 8 ohm coil and a 1000 ohm coil and it is like the one on Radio Shack website i really want to find an alterna
Hello I have found this audio video modulator. The author states that it works ok without using an audio transformer. Can it be done or is it hoax?
I do not have much experience on audio circuit. But, from you pcb, I have several questions: First, it seems that the pcb do not have a dedicated layer for gnd, and is this ok for the current circle? Second, the power filter capcitors is a little far from the chip, is this OK? Third, it seems that the pcb is layouted by auto router, all the trac
Want more information about designing of audio transformer for use in 70v line.
If the said radio shack transformer actually has 1:10 windings ratio (unfortunately I don't see a specification at Radio Shack) it most likely doesn't work in your application because of it's expectable high leak inductance. But you should try yourself. Simply consider an about 10 to 20 kHz cut off frequency for usual cheap audio transformer
I have an audio transformer that is rated on the datasheet with primary at 3.2 ohms and secondary at 1.2Kohms. I use it at 100Khz and it works fine. The thing is how can I work out the power on the primary. I can't accurately measure current because my multimeter seems to change measured current by a lot, lets say 0.4A. So I can only accurately mea
I really doubt, that the horn speaker can handle 80 W. Can you show a datasheet, what's the compression driver's size? 4 speakers are easy to match with a single 8 ohm output amplifier, 5 aren't. You can e.g. use two amplifiers with sufficient low output impedance and connect 2 respectively 3 in parallel. Or use a custom made power audio transforme
The transformer is that used in an IDE psu 220 ac input, 12v 2A 5V 2A output. It is an EI ferrite transformer with a gap between the center leg of the E shaped part and the I part ,the center leg is cylindrical. Its dimensions and number of turns for each winding are known (i have dismantled it). I found IDE psu schematic (or part of i
Hi my simple yet confusing question (at least to me) is, can audio transformer with 600 ohm primary and 600 ohm secondary winding be used in 50ohm primary 50ohm secondary circuit ? little about back ground, I have to tx/rx data over 30 to 50 ohm coaxial cable using interface that is actually designed for 600 ohm line. I will change op amp out
It appears this is a power transformer. Therefore it is designed to operate at power line frequencies (50Hz or 60Hz). It will not behave like a broadband audio transformer, in case you were planning on using it that way. As for the 500 ma. current specification, that looks like it is a specification for the 12 VAC windi
Hello I have a small audio transformer (8R:1K) at the output of a radio, having a secondary (secondary used as output to high impedance headphones) with 1k impedance. The original circuit used a 5K potentiometer, connected as a voltage divider to the secondary, as an audio volume. I was wondering if a 1K potentiometer should be better used (...)
audio transformers undergo the same laws as mains transformers. If you understand the basic formulas how voltage, current and impedance gets transformed, you can calculate most aspects of your audio transformer. Two special points should be mentioned: - low frequency full power limit The ability of a
I would have thought that the audio transformer would have broken down with this amount of abuse. Tough little things eh!
There are all sorts of passive networks that can change one impedance into another. The audio transformer is one example. Pi and T LC networks can also change the phase angle. Matching is a special case of impedance transformation where the new impedance is what you want. That is, you design the network to get the desired results. The networ
You may not need the transformer. Does the direct connection give you the acoustic signal level you want? Otherwise you will need an audio transformer. Try Tandy/Radio Shack for a in person purchase. There are several US mail order stores like Digikey and Mouser if you live there.
Dear all, I have a 2-wire dual mode speaker with the differential impeance 32 ohm, and it will driving by a audio amplifier with the output differential impedance 8 ohm. My question is that how can i do matching between them to maximize the efficiency. Thx a lot, Best rgds.
yes, but there is simplicity in it (as far as i've found on the net) and about the isolation, a small audio transformer 600ohm:600ohm will do the job
Hi Sakaz, One suggestion : 1) Do you have an oscilloscope and can you check if you ARE getting the DTMF tones on those pins ? I had an pre-assembled modem with a RJ jack for a handset.I used the handset jack to take the DTMF tone. Hence I did not have to go deeper into the modem.A problem I still have is that sometimes the DTMF tones are not re
The two wires of a telephone line are balanced so that each wire has the signal out-of-phase to cancel hum pickup. Your circuit grounds one wire of the telephone line which causes the other wire to act like an antenna that picks up all kinds of interference. Usually an audio transformer is used to keep the telephone line balanced and it also is
Let me put question bit differently, I need to interface coaxial cable to modem which are usually connected to phone line using 600 ohm line matching transformer but in my case coaxial cable is 30 to 50 ohm unbalance line. I think using 50 ohm audio transformer instead of 600 ohm will do the job. Any suggestion will be helpful Cheers
I have a little project that I am working with that is beating me at the moment and I thought an audio transformer could help me but alas no. From what I understand (now) is that any short circuit on the secondary side of a transformer, will be a short circuit on the primary due to induced flux across the transformer. (...)
For matching in this situation you can use a small audio transformer. Where the Turns Ratio of the transformer = SQRT (Load Resistance / Source Resistance) in your situation we can consider: TR = SQRT(32/50) = 0.8 As an example, if the transformer primary winding have 100 turns, the secondary winding must have 100 x 0.8 = 80 (...)
hi guys, i'm trying to build a circuit that will take the inverting dc voltage output from the pc speaker out and level shift it then using it as input to pic and send it back serially to pc program, the idea is to read the voltage signal (audio) and input the reading to pc i searched and found a lot of articles that talks about using 741 op
hi to all i got a project related to step-up the voltage up to 400 to 800v or more high and my input is 9v battery(use i remote and Multimeter). i tried 555 stun gun circuit. everything is working fine except transformer because i cant find audio transformer. i have a ferrite core EE. i tried to wind and check it. when i connect the (...)
1. You could use a simple audio transformer for the isolation. Jensen transformers manufacturers very good devices for that purpose. See more: 2. If you need more output power, you'll need a simple amplifier. A suitable IC could be LM386.
Hi, I am trying to use a Class D Amp to drive a non-audio application (360 - 12000Hz, load will vary), and am getting distortion on the output when no load or lighter load is present. The basic flow is: Class D Amp -> LPF -> Step Up Xfmr -> Output I am using the LPF in the Eval kit (Max9737). The LPF is designed for an 8Ω load
If your source and load have a common ground, you can use a simple resistor voltage divider. If you are concerned of temperature variation, you should work on the divider, select stable resistors or use a thermistor, and calibrate the divider over temperature. Without the common ground you will have to use a capacitor voltage divider, and again cal
Hi In my setup I have a fixed phone on a telephone line. I want to connect another 'DTMF generator' to phone line so that i can play DTMF tones.. It will only need to use 'DTMF generator' when my primary phone is off hook. Is there a way I can avoid a relay in my 'DTMF generator' as it will only be used when line is already in off-hook s
Your circuit is really crude! This is not the good way to obtain a 1 MHz AM modulated signal. You should feed 5 VDC to the crystal oscillator, and use a buffer amplifier in which you can apply the audio modulation. For 1 MHz you can use a common FET amplifier , input to gate and a LC resonant circuit in the drain. Then connect your audio transfor
audio transformer insulation is not suited for very high voltage maybe a few kV . You can get far better results with a small auto ignition coil. 30kV for example. Energy out will not exceed what you put in e.g. E=1/2 L I^2 * t
I need for some measurements make 230V vith variable frequency of 50-60Hz. So, I connected audio PA with two TDA1514 in bridge and powerline transformer 230/12V connected in reverse order to amplifier output. But problem is that amplifier get quickly very hot even vithout load and worse when use bigger (some 30VA) transformer. How can I (...)
We know that audio frequency transformer are used for Impedance matching in Amplifiers to convert high impedance to low impedance. Therefore its input and output coils turns are not same. Does it mean it also steps down the input voltage? Secondly, does impedance of audio frequency transformer consist of purely dc (...)
is this an audio transformer or an rf transformer ?
Hello, I'm looking for some schematics for an audio-amplifier with mosfets 2SJ162 and 2SK1058. e.g. Goof
You can consider to add a common collector driver between the transformer and the dialler. Then connect the audio to the driver input.
Your biggest problem is getting the core material. Your best bet would be tape wound cores in the form of toroids. In general you will start with an impedance ratio needed. Then take the square root to get the turns ratio. Then the number of turns needed is the amount that makes the inductive reactance several times the impedance at that si
I was wondering if we could use audio class D amp drivers like LM4651 to design a sine wave inverter. Won't it be perfect since it will o/p PWM control signals to drive a full bridge? All we need to design is the o/p filter (to remove the carrier) and the o/p transformer (this will be HF transformer) which will give us the required o/p taps (...)
Your safest bet is to use an audio oscillator set to a very low voltage to determine the turns ratio between different windings. This still will not tell you what frequency it works at and what mains voltage the primary is designed for. I would suggest that these last two uncertainties will cause a grave safety and fire issue which is more costly
Hello, I have a Car audio system i would like to set up in my house but have no idea how to do it. I have a Memphis audio 500x1 amp i want to plug in and use my Comp to run it for my Subs. I have a program alrdy made that will only push out the max of 4v's to go into the amp, but i need to Convirt the wall plugin to 12v or same as a car batter
Hi all ; i have a project about transmitting audio signals to the long distance ( about 1000 meters ) with cable connection inside a building. there is now way to transmit audio with any RF modulation or optic systems. so i have balance or unbalanced options. i am not the expert of audio so i need some help and some ideas to solve this (...)
Hello, I have the output of my audio amplifier with 4 to 8 ohm output impedance which can give 350mW of power to 8 ohm speaker. I want to make it 600 with 350mW of power, how to do it? What is the meaning of 600/600 matching transformer? Waiting for your encouraging reply, Regards Bakhat Rawan
Hi all, I always design and draw circuitry that involves microcontroller and audio circuitry. Most often I encounter digital noise that goes over the audio circuitry, especially if they are on the same PCB. I have tried many methods either to reduce or isolate the noise, but I would like to know if there are any other precaution that i do not kn
Hi all I need your's opinions partners, I want to make a power transformer for DC to DC converter, like use in car audio amplifiers, Vin 12V Vout 38V Freq, 35 to 50 khz is magnetics designer a good choice for this aplication ?
Hi to all, anyone know a good ebook about audio power amplifier? I need a ebook with formulas to project a audio power amplifier from zero.