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
Hobby Circuits and Small Projects Problems :: 18.12.2004 18:41 :: R00KIE :: Replies: 5 :: Views: 1306
What are the meanings of the following spec.?
audio transformer ( 200K to 1K CT Input)
Electronic Elementary Questions :: 13.12.2004 05:42 :: aasif :: Replies: 2 :: Views: 2032
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.
Analog Circuit Design :: 28.02.2007 13:18 :: flatulent :: Replies: 3 :: Views: 908
wht is the role of an audio transformer as compared to a normal transformer...........????where are they used??? how does it function??
Electronic Elementary Questions :: 23.02.2008 01:26 :: joe1986 :: Replies: 15 :: Views: 874
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 (...)
Analog Circuit Design :: 22.03.2010 15:46 :: FvM :: Replies: 1 :: Views: 916
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.
Electronic Elementary Questions :: 30.06.2013 12:37 :: Externet :: Replies: 2 :: Views: 167
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
Analog Circuit Design :: 05.04.2005 23:13 :: chinara :: Replies: 7 :: Views: 1214
Want more information about designing of audio transformer for use in 70v line.
Analog Circuit Design :: 11.08.2005 02:42 :: palesha :: Replies: 0 :: Views: 509
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
Analog Circuit Design :: 30.11.2006 14:09 :: compugeni :: Replies: 2 :: Views: 1236
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
Analog Circuit Design :: 22.02.2010 02:15 :: FvM :: Replies: 36 :: Views: 5819
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
Analog Circuit Design :: 01.08.2010 04:53 :: ants :: Replies: 15 :: Views: 1988
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
Power Electronics :: 23.05.2011 10:23 :: mastermhm :: Replies: 12 :: Views: 745
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
Power Electronics :: 19.09.2011 04:20 :: koshary :: Replies: 2 :: Views: 446
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
Analog Circuit Design :: 01.11.2011 06:59 :: mmuj :: Replies: 14 :: Views: 1169
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?
RF, Microwave, Antennas and Optics :: 14.03.2013 06:26 :: neazoi :: Replies: 31 :: Views: 1126
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
Analog Circuit Design :: 31.07.2013 00:50 :: Embedded_Geek :: Replies: 5 :: Views: 203
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 (...)
Professional Hardware and Electronics Design :: 06.02.2002 00:40 :: HMX :: Replies: 2 :: Views: 1422
I would have thought that the audio transformer would have broken down with this amount of abuse. Tough little things eh!
Hobby Circuits and Small Projects Problems :: 08.01.2004 09:24 :: GrandAlf :: Replies: 7 :: Views: 3170
is this an audio transformer or an rf transformer ?
Analog Circuit Design :: 08.01.2004 00:08 :: jlm :: Replies: 7 :: Views: 2518
I'm looking for some schematics for an audio-amplifier with mosfets
2SJ162 and 2SK1058.
Hobby Circuits and Small Projects Problems :: 22.01.2004 09:53 :: goofers1 :: Replies: 10 :: Views: 12274
You can consider to add a common collector driver between the transformer and the dialler. Then connect the audio to the driver input.
Hobby Circuits and Small Projects Problems :: 27.02.2004 23:16 :: buta :: Replies: 6 :: Views: 3518
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
Analog Circuit Design :: 03.06.2004 22:50 :: flatulent :: Replies: 2 :: Views: 839
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 (...)
Analog Circuit Design :: 12.09.2004 12:36 :: bimbla :: Replies: 2 :: Views: 2269
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 (...)
Analog Circuit Design :: 27.10.2004 13:24 :: House_Cat :: Replies: 5 :: Views: 2225
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
Electronic Elementary Questions :: 05.12.2004 17:32 :: flatulent :: Replies: 7 :: Views: 1918
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
Hobby Circuits and Small Projects Problems :: 30.12.2004 23:07 :: Telious :: Replies: 3 :: Views: 990
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
Analog Circuit Design :: 24.02.2005 19:03 :: flatulent :: Replies: 13 :: Views: 1087
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 (...)
Analog Circuit Design :: 05.03.2005 13:22 :: orpheus :: Replies: 1 :: Views: 1296
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,
Service Manuals, Requests, Repair Tips :: 04.04.2005 03:41 :: bakhat :: Replies: 5 :: Views: 990
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
Microcontrollers :: 27.04.2005 06:30 :: chicken_feet :: Replies: 0 :: Views: 777
I need your's opinions partners, I want to make a power transformer for DC to DC converter, like use in car audio amplifiers,
Freq, 35 to 50 khz
is magnetics designer a good choice for this aplication ?
Software Problems, Hints and Reviews :: 24.05.2005 23:05 :: MCMC :: Replies: 3 :: Views: 1164
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.
Hobby Circuits and Small Projects Problems :: 07.06.2005 18:34 :: flatulent :: Replies: 4 :: Views: 1561
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,
Professional Hardware and Electronics Design :: 19.07.2005 03:14 :: Mac7978 :: Replies: 1 :: Views: 1088
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.
Analog Circuit Design :: 21.07.2005 04:53 :: leemarrow :: Replies: 4 :: Views: 675
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
Professional Hardware and Electronics Design :: 28.07.2005 17:22 :: flatulent :: Replies: 4 :: Views: 1435
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.
Electronic Elementary Questions :: 21.11.2005 14:33 :: Borber :: Replies: 7 :: Views: 3993
could anyone explain to me y we need a audio isolating transformer in modems.
Analog Circuit Design :: 30.01.2006 17:23 :: danesh :: Replies: 1 :: Views: 549
I want to design audio Power transformer, ie Transistor Push-Pull based.
Is any software can HELP me to calculate impedance, power etc
Software Links :: 14.05.2008 12:17 :: paps :: Replies: 17 :: Views: 15356
please i need tolearn how to make maintenance for audio amplifiers please if you have any good book or program about this please put it here
Analog Circuit Design :: 30.10.2006 07:08 :: fatma1000 :: Replies: 14 :: Views: 1180
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
Analog Circuit Design :: 09.11.2006 21:17 :: ex4 :: Replies: 3 :: Views: 1808
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.
Electronic Elementary Questions :: 27.03.2007 14:46 :: flatulent :: Replies: 4 :: Views: 2744
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
eng. raafat tannir
Other Design :: 27.05.2007 14:18 :: marcony :: Replies: 0 :: Views: 670
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
Service Manuals, Requests, Repair Tips :: 30.08.2007 00:40 :: gaga2410 :: Replies: 3 :: Views: 4011
those hum are cause by some stray magnetic fields genearted by the transformer; audio circuits must be shielded
Other Design :: 28.12.2007 13:01 :: the_risk_master :: Replies: 2 :: Views: 2368
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.
Professional Hardware and Electronics Design :: 15.07.2008 03:51 :: dwep :: Replies: 3 :: Views: 1189
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
Analog Circuit Design :: 14.11.2008 13:47 :: eem2am :: Replies: 1 :: Views: 1184
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
Electronic Elementary Questions :: 08.05.2009 15:47 :: phaedrus :: Replies: 2 :: Views: 3159
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.
Power Electronics :: 19.07.2009 14:42 :: smd_lover :: Replies: 6 :: Views: 4749
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.
PC Programming and Interfacing :: 20.10.2009 01:39 :: msrihari :: Replies: 0 :: Views: 741
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
Analog Circuit Design :: 25.10.2009 14:10 :: Audioguru :: Replies: 3 :: Views: 1157