I have no audio transformer, i want to build on radio receiver, and i go to buy components like audio transformer, he told me they don't use anymore, what i have to use n place of audio transformerjedishrfu said:Do you have the original audio transformer?
Some sources on the internet suggest removing some of the tape around the transfer where you might find a blown fuse that can be replaced.
https://electronics.stackexchange.c...pair-how-can-i-find-a-replacement-transformer
Here's some more repair info:
https://www.premierguitar.com/articles/Why_and_How_to_Replace_Your_Amplifiers_Output_Transformer
dont take me wrong, i know thatjedishrfu said:Like this one or something more powerful:
http://www.instructables.com/id/Radio-receivers-from-scratch/
or this one:
http://boyslife.org/hobbies-projects/projects/40/catch-some-radio-waves/
That's a plain lie. Plenty of devices still use transformers in the audio output circuit.michael1978 said:the man he told they don't use anymore audio transformer in radio receiver
In that case, the transformer you want will depend on the resistance of the speakers it is driving (likely 4 or 8 Ohms) and the design of the amplifier driving it. Do you have a schematic of the audio output stage?michael1978 said:and i want to build transistor radio
Don't take this the wrong way, but I suspect they just did not want to bother with you.michael1978 said:because in electronics shop , where i was, e told me they don't use anymore audio transformerand i want to build transistor radio
We have suppliers in the UK such as Maplin, on the high street, that do T4 and T5 so I think they would be available on the web. I have also used small, low voltage mains transformers for audio purposes. You can find the turns ratio from the rated voltages. These days people try to avoid transformers in designs, as they have become expensive and big compared with the semiconductors, but in previous times transformers were used all over the place because they were reliable and reproducible. It is just the technology fashion of the moment. Everything was steam before that.michael1978 said:dont take me wrong, i know that
but i have a problem, with which component to replace those audio transformer
T1: audio transformer 10K primary or 2K secondary
T2: audio transformer 120 to 500 primary , 8 secondary
T3: audio transformer 10K primary 10K or 7K secondary
T4: audio transformer primary 1.5K , secondary 600 CT
T5: audio transformer primary 4.8 CT, secondary 8
because in electronics shop , where i was, e told me they don't use anymore audio transformerand i want to build transistor radio
How can be possible, he is a good man, i have a schematic i will put hereNFuller said:That's a plain lie. Plenty of devices still use transformers in the audio output circuit.
In that case, the transformer you want will depend on the resistance of the speakers it is driving (likely 4 or 8 Ohms) and the design of the amplifier driving it. Do you have a schematic of the audio output stage?
but how is possible, to bother, he say simple they don't use anymore audio transformer,Averagesupernova said:Don't take this the wrong way, but I suspect they just did not want to bother with you.
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Listen to what others here tell you. They know what they are talking about.
You should first consider what the impedance is of the speaker you will be driving. The output impedance of the secondary should match the impedance of the speaker.michael1978 said:the first
https://www.mupload.nl/img/eccf7t9nnfrau.png
the second
https://www.mupload.nl/img/qlmllyb0wq8da.png
but there are still other circuits which they use
T1: audio transformer 10K primary or 2K secondary
T2: audio transformer 120 to 500 primary , 8 secondary
T3: audio transformer 10K primary 10K or 7K secondary
T4: audio transformer primary 1.5K , secondary 600 CT
T5: audio transformer primary 4.8 CT, secondary 8
I take from the book build you own radio transistor
can somebody help me where to buy and how to select it, i am a beginner, i never buy till now transformers
thnx
have a nice wekend
Transformers still find use in audio output circuits because speakers present such a low impedance load to the circuit. Although modern semiconductors can drive low impedance loads, most transistors will not be happy trying to dump hundreds of milliamps into a speaker. A transformer fixes this problem by turning the low impedance load of a speaker into a high impedance load on the transformer primary.michael1978 said:but how is possible, to bother, he say simple they don't use anymore audio transformer,
hello can i use ic audio power amp in place of audio transformerjim hardy said:Take a look at these
http://www.hammondmfg.com/5caud.htmBetter electronic suppliers will have them
https://www.alliedelec.com/view/search?keyword=audio transformer
and you might salvage one from a thrown away radio.
can i use maybe in place ic audio power ampCWatters said:What sort of electronics shop? I don't know any in my country that would sell audio stage transformers (apart from output stage maybe). You would have to go to a professional electronic components distributor.
Mouser perhaps..
https://www.mouser.co.uk/Mobile/Passive-Components/Transformers-Audio-Signal/_/N-5gbg
can i use ic audio power ampCWatters said:What sort of electronics shop? I don't know any in my country that would sell audio stage transformers (apart from output stage maybe). You would have to go to a professional electronic components distributor.
Mouser perhaps..
https://www.mouser.co.uk/Mobile/Passive-Components/Transformers-Audio-Signal/_/N-5gbg
can i use ic audio power ampNFuller said:Transformers still find use in audio output circuits because speakers present such a low impedance load to the circuit. Although modern semiconductors can drive low impedance loads, most transistors will not be happy trying to dump hundreds of milliamps into a speaker. A transformer fixes this problem by turning the low impedance load of a speaker into a high impedance load on the transformer primary.
can i use ic audio power ampNFuller said:You should first consider what the impedance is of the speaker you will be driving. The output impedance of the secondary should match the impedance of the speaker.
The primary coil of the transformer is the load that the transistor will drive. The constraints on the primary resistance are that it must be large enough that the maximum current through the transistor stays below its maximum design value and small enough that distortion of the audio signal is minimal. I would say anything between a few hundred ohms to a kilo-ohm is fine. If you are interested in finding the specific behavior of the audio output, then you will need to draw up the load line for the output stage. If you have never done this before then here is a brief introduction
https://www.tutorialspoint.com/basic_electronics/basic_electronics_transistor_load_line_analysis.htm
can i use ic audio power ampjim hardy said:Take a look at these
http://www.hammondmfg.com/5caud.htmBetter electronic suppliers will have them
https://www.alliedelec.com/view/search?keyword=audio transformer
and you might salvage one from a thrown away radio.
michael1978 said:can i use ic audio power amp
Yes, you can use these without an audio transformer.michael1978 said:can i use ic audio power amp
thank you man, you make me easy now, because this audio transformer i don't understandjim hardy said:Sure. Plenty of them around. LM386 will drive a small speaker and is very easy to use, will operate fine from a 9v battery..
http://www.ti.com/lit/ds/symlink/lm386.pdf
several hobby kits available with a printed circuit board.
This kit and 6 inch speakers in a proper enclosure will fill a room with music.
http://www.kitsrus.com/pdf/k88.pdf
i've built several. Friends raved about the high quality sound.
old jim
thank you, now its easy for me...NFuller said:Yes, you can use these without an audio transformer.
There are a few signs that may indicate that your audio transformer needs to be replaced. These include distorted or weak audio output, a humming or buzzing sound, or no sound at all. If you notice any of these issues, it's a good idea to check the audio transformer for any physical damage or test it with a multimeter to confirm if it is functioning properly.
No, it's important to use a replacement transformer that is specifically designed for audio applications. Audio transformers have certain characteristics and specifications that are necessary for proper functioning in a radio receiver. Using a different type of transformer may result in poor audio quality or damage to the receiver.
Replacing an audio transformer in a radio receiver does not require any special tools or skills. However, it is important to have a basic understanding of electronics and how to safely handle and solder components. You will also need a multimeter to test the new transformer and ensure it is functioning correctly.
If you have experience with electronics and feel comfortable working with soldering irons and electronic components, you may be able to replace the audio transformer yourself. However, if you are unsure or uncomfortable with the process, it's always best to take it to a professional who can safely and accurately replace the transformer for you.
There are a few ways to find a replacement audio transformer for your radio receiver. You can search online for a replacement part that is specifically designed for your make and model of receiver. You can also consult a local electronics store or a professional technician for assistance in finding the right replacement transformer.