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Hello
This is my first diy audio project. The main
constraint for this project would be the price because as a
student I can’t afford costly parts. So it took me quite a
bit of time to find all the parts at a reasonable price.
I first found 4 broken automatic car battery
chargers, from which I used the heatsinks and the
transformers. There were two 200VA (estimated) EI transformers
with 14 V secondary’s in each charger. Four of those with secondary’s
in series became the power supply of my aleph 5. The secondary’s of the
other 4 I used as inductor in a CLC filter. The speaker connections also came
from those chargers.
I also dismantled a broken electronic welder
from wich I used the rectifier bridges and wiring. I used wiring and NTC’s from broken computer
supply’s.
I made the boards myself at school. The only
costly things which I couldn’t recycle were the
transistors and the power supply capacitors. I bought those online
at reichelt elektronik.
So after some weekends diy I ended up with an
aleph 5 at a very reasonable price of 150 euros total. The
only thing I didn’t cut back on was the blue led :-). I
mounted the transistors on a copper bar 3cm*1cm which came from a electrical
power substation and clamped the transistors with an aluminium profile.
DC offset is 10 mV left and 25 mV right. It runs the standard 2 A bias
and after an hour it reaches 52° C.It's quite heavy weighing 25 kg.
The sound is very good and detailed and I can
only hear a bit of hum with my ear close to the speaker.
I wish to thank Nelson for sharing his wonderful
designs.
Andries
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