I recently accuired an old Elektor Magazine from 1983. In it is a design of a 160mW Class-A discrete headphone amplifier.
I want to build it, but is it worthwhile to build a discrete amplifier (with way more components) or can I use a LM833, which I’ve bought already, and get the same quality sound?
I have no problem building either, but will have to design a PCB if using the LM833.
If the op-amp variation is better, is there a good PCB layout around?
I want to build it, but is it worthwhile to build a discrete amplifier (with way more components) or can I use a LM833, which I’ve bought already, and get the same quality sound?
I have no problem building either, but will have to design a PCB if using the LM833.
If the op-amp variation is better, is there a good PCB layout around?
Well, in that case, an opamp is out. You need something that can drive what is in effect a speaker load, albeit not to such high levels. Any info on sensitivity? How many volts or milliwats does this require for max sound level?
Jan Didden
PS Are you sure? I thought most headphones are 32 or above ohms?
Jan Didden
PS Are you sure? I thought most headphones are 32 or above ohms?
The headphones are an old pair of kenwoods from almost 25 years ago. It was my dad's. They play beautifully.
I did measure them with a VOM but I'll just make sure tonight at home.
I dont know the specs for the headphones and the Elektor magazine is at home also.
If I read your answer correctly. Is op-amps ok to use SQ wise when you use higher impedance headphones (+32Ohms ?) ?
I did measure them with a VOM but I'll just make sure tonight at home.
I dont know the specs for the headphones and the Elektor magazine is at home also.
If I read your answer correctly. Is op-amps ok to use SQ wise when you use higher impedance headphones (+32Ohms ?) ?
Wynand said:The headphones are an old pair of kenwoods from almost 25 years ago. It was my dad's. They play beautifully.
I did measure them with a VOM but I'll just make sure tonight at home.
I dont know the specs for the headphones and the Elektor magazine is at home also.
If I read your answer correctly. Is op-amps ok to use SQ wise when you use higher impedance headphones (+32Ohms ?) ?
There are opamps that can drive 32 ohms, but ususally they cannot. Hi-speed opamps used for ADSL are generally very good for this low impedances, and they have low distortion as well.
There is also a special headphone chip available that CAN do it. Search the forum, there is quite a lot of traffic on it. I think Per-Anders has a design on it.
Jan Didden
Thank you very much. I think I'm gonna build the Elektor amplifier.
Reasons are
1) I'll be my first Class-A amplifier
2) It already designed by people who know
3) I've got most parts
4) It can drive 8 Ohms
5) It should be a good reference Amplifier for future Op-anp designs.
Thanks for your help.
I must be off now.
Bye.
Reasons are
1) I'll be my first Class-A amplifier
2) It already designed by people who know
3) I've got most parts
4) It can drive 8 Ohms
5) It should be a good reference Amplifier for future Op-anp designs.
Thanks for your help.
I must be off now.
Bye.
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