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187 Threads found on edaboard.com: 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.
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.
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
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 am new to electronics, and am trying to play the same audio file through five megaphones that are 80 w at 8 ohms. Being new to electronics, I am not sure what is the best and fastest way of setting up all to play audio file, and even more importantly how to power all of them at the megaphones. I live in Korea so the power is different. Here
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
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?
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
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 (...)
I would have thought that the audio transformer would have broken down with this amount of abuse. Tough little things eh!
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 (...)
Yes, there are differences between 50-60Hz transformers, audio transformers, and RF transformers. You don't mention how high your high frequency may be. The core materials are generally different. Power transformers that operate at line frequency can have soft iron cores to magnetically couple the (...)
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
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
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 ?
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.
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.
I was thinking of the common case of sending audio signals over long cables and having transformers at the ends. If you have small common mode voltages, the classical op amp circuit with four resistors will work. If you use 0.1% resistors the CMRR should be near 55 dB which is pushing the op amp limits. You can also use the classical three amp
Another kind of isolation transformer is audio isolation transformer. It is 1:1 in most cases. Using isolation transformer enables the secondary circuit to be galvanically isolated from the primary circuit. Actually any kind of transformer does this.
hi, could anyone explain to me y we need a audio isolating transformer in modems. Regards
I want to design audio Power transformer, ie Transistor Push-Pull based. Is any software can HELP me to calculate impedance, power etc
What is the main distortion source for the audio amplifier? The resistors, capacitors or amplifier? Can any body give some suggestion?
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
Another thing is that the pulse transformer is specified by time domain parameters. audio transformers are specified by frequency domain, impedance levels, and power. Power transformers are specified by voltage and current at each winding as well as the operating frequency.
Soft-start controller is gentle on loads like troidel transformer Ido make this circuit & it's work very well i make alot of this but they are very complecated & not usefell I drow this on eagle layout if some need it jeust remail me best regards eng. raafat tannir
Hello everyone, I need the service manual or schematics for a Philips power amplifier : FA660/00R. Thank you for your help ! Or, if you can help me to repair, i explain to you the problem : When I plug a small loudspeaker, it got in protection. Since I test the amplifier the fuse burns. If I use a strong fuse, it snore and the two resi
those hum are cause by some stray magnetic fields genearted by the transformer; audio circuits must be shielded
In type design,there is a transformer for audio signal coupling.But I do not know how to calculate the characteristic impedance of the transformer. So I want to use 2 caps to replace the transformer.But I do not know this idea is good or bad.
you mean audio noise? ...thats normal if its unvarnished. maybe you improve by taping tightly the windings. some ceramic caps make audible noise or d'yuo meen electrical noise.. in that case you could put a snubber on like RCD snubber
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
Sinusoidal? You mean to drive the mosfets 'analog' like in an audio amplifier? Normally the 2 N-ch mosfets are connected to ground with the sources. The centertap is connected to the positive supply. Each mosfet willl pull the transformer winding to ground one by one.
hello, i am using sim300 based gsm modem.i want to interfac gsm audio with pc.i have handset connector and through 1:1 isolation transformer i connected it to pc. i am able to hear the audio played in the pc thorugh phone but unable to interface with microcphone,some humm noise is coming.how can i perfectly interface with microcphone.
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