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300 watt Hi-fi power amp project.+A -A |
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Autor |
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hydrovac
Neuling |
#1 erstellt: 19. Jul 2013, 19:55 | |
Hi all DIYers, Building a 300 watt Hi-fi power amp, which we designed and prototyped few years ago. Please follow the links for details. http://www.diyaudio....power-amplifier.html http://www.diyaudio....r-4.html#post1330047 PCBs have been fabricated and gathering all components on hand. Few pictures of the same. IMG_4459 by hydrovac, on Flickr IMG_4458 by hydrovac, on Flickr IMG_4461 by hydrovac, on Flickr IMG_4462 by hydrovac, on Flickr IMG_4570 by hydrovac, on Flickr IMG_4575 by hydrovac, on Flickr IMG_4465 by hydrovac, on Flickr IMG_4464 by hydrovac, on Flickr |
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hydrovac
Neuling |
#2 erstellt: 22. Jul 2013, 19:15 | |
Holes for output devices drilled on heat sinks using a TO3 jig. Input and speaker binding posts holes done and connectors mounted. IMG_4448 by hydrovac, on Flickr IMG_4366 by hydrovac, on Flickr IMG_4556 by hydrovac, on Flickr IMG_4481 by hydrovac, on Flickr This is the den for our hobby & passion, and where all our classics come to life. IMG_4399 by hydrovac, on Flickr IMG_4398 by hydrovac, on Flickr IMG_4397 by hydrovac, on Flickr IMG_4396 by hydrovac, on Flickr IMG_4315 by hydrovac, on Flickr IMG_4314 by hydrovac, on Flickr IMG_4313 by hydrovac, on Flickr Power transistors mounting process and progress. IMG_4420 by hydrovac, on Flickr IMG_4412 by hydrovac, on Flickr IMG_4409 by hydrovac, on Flickr IMG_4416 by hydrovac, on Flickr IMG_4414 by hydrovac, on Flickr IMG_4412 by hydrovac, on Flickr IMG_4449 by hydrovac, on Flickr IMG_4442 by hydrovac, on Flickr |
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hydrovac
Neuling |
#3 erstellt: 02. Aug 2013, 13:20 | |
Hi friends, Sorry for the long gap in my post as I was preoccupied with other commitments. In continuation to my earlier posts, here is progress in amp build. Checking the DC rail voltages: Left channel, Right channel, both channels IMG_4645 by hydrovac, on Flickr IMG_4646 by hydrovac, on Flickr IMG_4648 by hydrovac, on Flickr Checking full rail voltages: Left channel, Right channel, - Ve and +Ve rails IMG_4652 by hydrovac, on Flickr IMG_4653 by hydrovac, on Flickr IMG_4655 by hydrovac, on Flickr I am supposed to get around +62 and -62 volts DC on rails. The increase in reading is because of the mains input voltage (250 volts AC). Toroidal transformer winding is rated for 230 volts primary. IMG_4682 by hydrovac, on Flickr IMG_4686 by hydrovac, on Flickr IMG_4683 by hydrovac, on Flickr Setting the quiescent bias current for output stage: Fabricated a 10 ohm 5 watt wire wound resistor suitable for the fuse holder. IMG_4671 by hydrovac, on Flickr IMG_4674 by hydrovac, on Flickr Inserted in +Ve side holder and switched on the power. Adjusted the trim pot to get, 1.0 volt across the resistor. IMG_4658 by hydrovac, on Flickr IMG_4660 by hydrovac, on Flickr IMG_4661 by hydrovac, on Flickr IMG_4662 by hydrovac, on Flickr IMG_4657 by hydrovac, on Flickr IMG_4659 by hydrovac, on Flickr You can see the thermal sensing bias transistors mounted mid way between the power transistors on the heat sink. Good going so far. IMG_4678 by hydrovac, on Flickr IMG_4680 by hydrovac, on Flickr IMG_4679 by hydrovac, on Flickr Now, looking at output side. Measuring the speaker output terminals for DC. IMG_4669 by hydrovac, on Flickr IMG_4668 by hydrovac, on Flickr IMG_4667 by hydrovac, on Flickr Left channel looks clean without any DC. But right channel is showing 0.04 volts. There seems to be a hitch somewhere. I will get back with updates after trouble shooting. Thanks for looking and following the post. |
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hydrovac
Neuling |
#4 erstellt: 13. Aug 2013, 05:46 | |
Actually 40mv dc offset isn’t that bad. I traced it to a slightly leaky cap. Replaced it and now it reads 1.5mv on right channel and 2.8mv on left channel, in 200mv range of multi meter. My Dc offset is excellent and will not damage the speakers, but many say as high as 50mv is still OK. I connected a source and performed an extensive listening session. Must confess the amp has an amazing sonic quality. IMG_4441 by hydrovac, on Flickr IMG_4445 by hydrovac, on Flickr IMG_4478 by hydrovac, on Flickr IMG_4482 by hydrovac, on Flickr IMG_4580 by hydrovac, on Flickr IMG_4579 by hydrovac, on Flickr IMG_4577 by hydrovac, on Flickr |
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Brueckenwaechter
Stammgast |
#5 erstellt: 19. Sep 2013, 11:23 | |
Damn nice Job! Does it come in Pink? |
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