Hi,
I've been building a little boombox to take traveling. Pix are here.
I was advised at 41Hz forum to use an Oxford A262A3E audio transformer on the input to the amp I was going to use, which was a 41Hz AMP6. This was to lift the input to correct for the deficiencies in the Monacor SPH-30X/4 speakers I have and to prevent ground loop buzz.
The AMP6 is gone, exploded and stomped on, so I have a JuanJing Tripath instead for this build.
My question is how do I wire the input transformer.
I really have no idea at all how to do this. I have a bunch of speaker and amp theory PDFs collected off this site that I'll understand in about six months. I'm clueless. I have two of these things as I thought they were supposed to go between the amp and the speakers.
If anyone can advise which wires to connect to which I'd be very grateful. Otherwise it's out with the crocodile clips and random experimentation 😱)
cheers!
http://www.yuan-jing.com/ClassD-T/TA2024-ClassD-Power-Amplifier-Board-15W-15W
I've been building a little boombox to take traveling. Pix are here.
I was advised at 41Hz forum to use an Oxford A262A3E audio transformer on the input to the amp I was going to use, which was a 41Hz AMP6. This was to lift the input to correct for the deficiencies in the Monacor SPH-30X/4 speakers I have and to prevent ground loop buzz.
The AMP6 is gone, exploded and stomped on, so I have a JuanJing Tripath instead for this build.
My question is how do I wire the input transformer.
I really have no idea at all how to do this. I have a bunch of speaker and amp theory PDFs collected off this site that I'll understand in about six months. I'm clueless. I have two of these things as I thought they were supposed to go between the amp and the speakers.
If anyone can advise which wires to connect to which I'd be very grateful. Otherwise it's out with the crocodile clips and random experimentation 😱)
cheers!
http://www.yuan-jing.com/ClassD-T/TA2024-ClassD-Power-Amplifier-Board-15W-15W
you need 2 separate transformers for left and right, each with ONE secondary and ONE primary,with 1:1 wind ratio,yours cannot be used since it has different values.
Search for 600 Ohm telephone transformer and get two of them
Search for 600 Ohm telephone transformer and get two of them
I can't see the point of using transformers in a portable boom box. It is battery powered? If so you won't get any ground loops.
They will take up valuable space. How are they supposed to "correct for the deficiencies in the Monacor SPH-30X/4 speakers"? All it will do is add bass roll off and distortion.
Final nail in the coffin though is the 600 ohm input impedance you will end up with. Will be OK using a headphone output to drive the boombox, but anything else will be horrendously overloaded.
They will take up valuable space. How are they supposed to "correct for the deficiencies in the Monacor SPH-30X/4 speakers"? All it will do is add bass roll off and distortion.
Final nail in the coffin though is the 600 ohm input impedance you will end up with. Will be OK using a headphone output to drive the boombox, but anything else will be horrendously overloaded.
Hi,
They can be used on the inputs (not the outputs) of
an amplifier but are usually simply not necessary.
Primaries in parallel - input, secondaries in parallel -
to a 10K amplifier input, will significantly boost
the headphone output of a portable player.
What they have do do with your speakers
is beyond me and any sensible analysis.
There should not be any ground loops to fix.
rgds, sreten.
They can be used on the inputs (not the outputs) of
an amplifier but are usually simply not necessary.
Primaries in parallel - input, secondaries in parallel -
to a 10K amplifier input, will significantly boost
the headphone output of a portable player.
What they have do do with your speakers
is beyond me and any sensible analysis.
There should not be any ground loops to fix.
rgds, sreten.
Ok, thank you for the info, it seems that not only do I not understand them, I do not need them. Thanks for helping me make the decision to abandon this path.
Onto eBay with the blighters.
Onto eBay with the blighters.
Here's my chance to confuse you more.
If your laptop has a Line Out jack, that can be connected directly to the amplifier inputs.
If you must use a headphone out from your laptop, that is a low voltage,lower impedence output, and may not have a high enough voltage for the amplifier input. Try a direct hookup first, and if it works fine you are done. If the volume is low or distorted, try the transformers, however the ones you have may boost the voltage too much.
If your laptop has a Line Out jack, that can be connected directly to the amplifier inputs.
If you must use a headphone out from your laptop, that is a low voltage,lower impedence output, and may not have a high enough voltage for the amplifier input. Try a direct hookup first, and if it works fine you are done. If the volume is low or distorted, try the transformers, however the ones you have may boost the voltage too much.
Thank you Ed.
It sounds great using my laptop, tablet and phone. More than enough power, so no need for correction.
It seems all of these devices have an output that is neither what is accepted as a headphone level or a line out level. They are somewhere in between. So in this instance I am fine. I guess the correct thing to do would be to using a sound card or pre-amp which has proper settings for both.
As an addendum I'm using both batteries and mains for the laptop and can detect no hum with either.
Thanks again, slowly getting there with all this.
It sounds great using my laptop, tablet and phone. More than enough power, so no need for correction.
It seems all of these devices have an output that is neither what is accepted as a headphone level or a line out level. They are somewhere in between. So in this instance I am fine. I guess the correct thing to do would be to using a sound card or pre-amp which has proper settings for both.
As an addendum I'm using both batteries and mains for the laptop and can detect no hum with either.
Thanks again, slowly getting there with all this.
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