1000 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 :: 12-18-2004 18:41 :: R00KIE :: Replies: 5 :: Views: 1331
What are the meanings of the following spec.?
audio transformer ( 200K to 1K CT Input)
Electronic Elementary Questions :: 12-13-2004 05:42 :: aasif :: Replies: 2 :: Views: 2110
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 :: 02-28-2007 13:18 :: flatulent :: Replies: 3 :: Views: 927
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 :: 02-23-2008 01:26 :: joe1986 :: Replies: 15 :: Views: 896
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 :: 03-22-2010 15:46 :: FvM :: Replies: 1 :: Views: 935
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 :: 06-30-2013 12:37 :: Externet :: Replies: 2 :: Views: 194
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 :: 11-30-2006 14:09 :: compugeni :: Replies: 2 :: Views: 1284
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 :: 03-14-2013 06:26 :: neazoi :: Replies: 31 :: Views: 1192
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 :: 04-05-2005 23:13 :: chinara :: Replies: 7 :: Views: 1242
Want more information about designing of audio transformer for use in 70v line.
Analog Circuit Design :: 08-11-2005 02:42 :: palesha :: Replies: 0 :: Views: 526
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 :: 02-22-2010 02:15 :: FvM :: Replies: 36 :: Views: 5944
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 :: 08-01-2010 04:53 :: ants :: Replies: 15 :: Views: 2025
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
Power Electronics :: 05-25-2011 08:16 :: FvM :: Replies: 12 :: Views: 775
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 :: 09-19-2011 04:20 :: koshary :: Replies: 2 :: Views: 484
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 :: 11-01-2011 06:59 :: mmuj :: Replies: 14 :: Views: 1241
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 :: 07-31-2013 00:50 :: Embedded_Geek :: Replies: 5 :: Views: 219
If you talk about matching first requirement is that audio source must have 8ohms output impedance and second is that transformer must be terminated with 1k. What is your audio source output impedance?
Analog Circuit Design :: 10-20-2014 09:01 :: Borber :: Replies: 11 :: Views: 257
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 :: 01-08-2004 09:24 :: GrandAlf :: Replies: 7 :: Views: 3278
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 :: 02-24-2005 19:03 :: flatulent :: Replies: 13 :: Views: 1103
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 :: 06-07-2005 18:34 :: flatulent :: Replies: 4 :: Views: 1609
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 :: 07-19-2005 03:14 :: Mac7978 :: Replies: 1 :: Views: 1114
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 :: 11-09-2006 21:17 :: ex4 :: Replies: 3 :: Views: 1847
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 :: 05-08-2009 15:47 :: phaedrus :: Replies: 2 :: Views: 3203
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 :: 10-25-2009 14:10 :: Audioguru :: Replies: 3 :: Views: 1188
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
Analog Circuit Design :: 10-02-2011 17:12 :: mmuj :: Replies: 7 :: Views: 938
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. (...)
Analog Circuit Design :: 12-27-2011 18:37 :: zerodegreec :: Replies: 3 :: Views: 547
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 (...)
RF, Microwave, Antennas and Optics :: 05-07-2012 11:46 :: vfone :: Replies: 9 :: Views: 552
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
Digital Signal Processing :: 05-15-2012 09:53 :: kobre98 :: Replies: 17 :: Views: 1440
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 (...)
Analog Circuit Design :: 08-11-2012 08:12 :: muhammadali_16 :: Replies: 5 :: Views: 605
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.
Analog Circuit Design :: 08-26-2012 10:20 :: eeroalk :: Replies: 1 :: Views: 281
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
Analog Circuit Design :: 02-04-2013 14:29 :: MarkCSI :: Replies: 5 :: Views: 420
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
Analog Circuit Design :: 05-10-2014 04:18 :: jiripolivka :: Replies: 3 :: Views: 340
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
Hobby Circuits and Small Projects Problems :: 08-10-2014 08:26 :: tiwari.aditya13 :: Replies: 2 :: Views: 151
I'm using a 1 MHz crystal oscillator and a crude amplitude modulation circuit (shown below), and I wanted to amplify the output. I wondered if anyone knew of a circuit I should use to amplify this?
I'm also assuming there would be a problem with harmonics flooding other frequencies, could I filter these out usin
RF, Microwave, Antennas and Optics :: 09-06-2014 05:36 :: Resistanceisfutile :: Replies: 5 :: Views: 199
The 555 operates at a fairly low audio frequency and the diodes are very slow. So you should use a 1k ohm to 8 ohm audio transformer with the 8 ohm winding at the BD679 and the 1k winding at the voltage multiplier. The article should say the required power rating of the transformer which might be 10W or more.
Hobby Circuits and Small Projects Problems :: 09-15-2014 08:26 :: Audioguru :: Replies: 10 :: Views: 275
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 :: 02-06-2002 00:40 :: HMX :: Replies: 2 :: Views: 1447
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 (...)
Electronic Elementary Questions :: 09-07-2012 01:17 :: tahir4awan :: Replies: 3 :: Views: 297
is this an audio transformer or an rf transformer ?
Analog Circuit Design :: 01-08-2004 00:08 :: jlm :: Replies: 7 :: Views: 2565
I'm looking for some schematics for an audio-amplifier with mosfets
2SJ162 and 2SK1058.
Hobby Circuits and Small Projects Problems :: 01-22-2004 09:53 :: goofers1 :: Replies: 10 :: Views: 12401
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 :: 02-27-2004 23:16 :: buta :: Replies: 6 :: Views: 3557
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 :: 06-03-2004 22:50 :: flatulent :: Replies: 2 :: Views: 858
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 :: 09-12-2004 12:36 :: bimbla :: Replies: 2 :: Views: 2331
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 :: 12-05-2004 17:32 :: flatulent :: Replies: 7 :: Views: 1958
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 :: 12-30-2004 23:07 :: Telious :: Replies: 3 :: Views: 1015
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 :: 03-05-2005 13:22 :: orpheus :: Replies: 1 :: Views: 1336
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: 1013
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 :: 04-27-2005 06:30 :: chicken_feet :: Replies: 0 :: Views: 814
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 :: 05-24-2005 23:05 :: MCMC :: Replies: 3 :: Views: 1187
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 :: 07-21-2005 04:53 :: leemarrow :: Replies: 4 :: Views: 698
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 :: 07-28-2005 17:22 :: flatulent :: Replies: 4 :: Views: 1457