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class a elektor headphone amp

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#21
Bad news, i accedently blew an output transistor because its heatsink came in contact with the other ones emitter resistor.

What do you think about using two of these: http://pdf1.alldatasheet.com/datasheet-pdf/view/38417/SANKEN/STA434A.html as output transistors pressed against a heatsink ?

They are from a stepper driver, but i think they should work for audio too, tho they are darlington but i don´t think that should matter.

What do you think ?
 
#22
Tekko said:
Bad news, i accedently blew an output transistor because its heatsink came in contact with the other ones emitter resistor.

What do you think about using two of these: http://pdf1.alldatasheet.com/datasheet-pdf/view/38417/SANKEN/STA434A.html as output transistors pressed against a heatsink ?

They are from a stepper driver, but i think they should work for audio too, tho they are darlington but i don´t think that should matter.

What do you think ?
Click to expand...

I say you should not (can not) use those.
It is a totally different type.

Replace with original BD139/BD140, or MJE340/MJE350 which are in same TO126 class.
Eventually you could try some TO220 transistors, for example MJE15030/MJE15031.

And use your amplifier only for headphones.
To modify for driving loudspeakers, you need some experience to know what changes to make.
 
#23
I know its an other type, its a darlington H-bridge but not connected to each other so i can easily hook them up as they were normal single darlington transistors.

I don´t have any of the transistors u suggested.

But if someone has a few over i´ll gladly take them.

The amp gladly drives speakers as is, i have played it loud and it doesent even get warm.
 
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