Wait till you have assembled the PSU and amplifier and then measure the amplifier supply voltage after you have set the output bias current.
Then you can try to develop a model that matches the assembly specification to the "as built" measurements and use that new model to predict any future builds.
Then you can try to develop a model that matches the assembly specification to the "as built" measurements and use that new model to predict any future builds.
A simple se, stereo, one stage, 4 parallel mosfets (circuit-regarded), active dc-current, switchable active ac-current. 2 x 200 va dissipation. Psu: c - l,r/r - c - l,r/r - c (stage 1 resistance-regarded, stage 2 and 3 circuit-regarded; l,r/r-switchable). 66 x 35 x 45 cm. The most would call zen + ccs, switchable aleph or so.
BUT: sounds not as clean as the same with not-paralleled mosfets - sounds more like a brown bear than a black panther,-) Not as fast, not as clean, but great, "power", drive, a repleted oil-painting.-)
Front within the next days.
BUT: sounds not as clean as the same with not-paralleled mosfets - sounds more like a brown bear than a black panther,-) Not as fast, not as clean, but great, "power", drive, a repleted oil-painting.-)
Front within the next days.
Attachments
have you input/driving buffer?
when paralleled , mosfets can be nasty , regarding driving demand
when paralleled , mosfets can be nasty , regarding driving demand
IMO.
Deserve Fugly accreditation
Tell me 😉
Recycled Heat Sinks From Industrial inverters?
Size ?
Bias Current?
The most do confound "driving demand", by sep. buffer ex., and "sound" or "good" "performance". Most they do need "better", much "better", cleaner! speakers and sources and more ... What does he talking about;-?
Recycled.
For a friend.
45 x 30 x 5 cm, 21 rips.
64 V; 4 x 0,75 A per ch.
Recycled.
For a friend.
45 x 30 x 5 cm, 21 rips.
64 V; 4 x 0,75 A per ch.
Here taps the (brown) bear,-) Yeah,-)
A se-mosfet-amp, one stage, with an "open" input - the psu is very good - does not need a further buffer, driver or more (the four paralleled mosfets, their minimal different characters, together, smear a little bit). The most DACs drive mosfets. To regard capacities and more is not necessary. Most important is the less of noisy, distorting (not the common looking-measured) components. If anybody uses buffers - in my mind - he has not much experiences in speakers, sources and arrangements or has unclean ears or "do want a chic pre-amp" or is not listening, not a listener,-) In my mind. If you listen records, build any 1-, 2-step RIAA. It will drive. Result is a 2- or 3-step-amplification - If that does not sound very very good, clean! replace the speakers - do not use any/a multiway, no chance,-!
I do not have any further questions,-)
My mind,-)
A se-mosfet-amp, one stage, with an "open" input - the psu is very good - does not need a further buffer, driver or more (the four paralleled mosfets, their minimal different characters, together, smear a little bit). The most DACs drive mosfets. To regard capacities and more is not necessary. Most important is the less of noisy, distorting (not the common looking-measured) components. If anybody uses buffers - in my mind - he has not much experiences in speakers, sources and arrangements or has unclean ears or "do want a chic pre-amp" or is not listening, not a listener,-) In my mind. If you listen records, build any 1-, 2-step RIAA. It will drive. Result is a 2- or 3-step-amplification - If that does not sound very very good, clean! replace the speakers - do not use any/a multiway, no chance,-!
I do not have any further questions,-)
My mind,-)
I have been searching appropriate motor run cap on net, but the price difference is so diverse, from $5 to $50, and the brand names are all unfamiliar to me (except Dayton, but I'm afraid Dayton may sell $5 cap for $30 just putting Dayton name on it).
How you guys find the right one?
How you guys find the right one?
Saw used ones from various appliances in two, and reach for the magnifiying glass (kitchen scale, calipers).
Lovely weekend, finished installing air core inductor 3mH 0.6Rdc, set bias to 500mV. some measurement result on AlephJ :
- Vds 20.5V, Inductor Vdrop 1.1V
- Vac ripple 3mV, previously 20mV with CRC (hopefully my sanwa meter is correct)
- Laser temp meter shows 44°C, I can put my palm on the heatsink for long time
Eventhought my chassis is only 4U, I can achieve this high bias because of room hack. I put room AC to blow on audio rack, not to the bed. I told to my wife that direct AC blow is not good for health. In fact my intention was cool down the chassis 😛
Still waiting my package for motor run cap 60uF, only paid around $2.5 each 😱
- Vds 20.5V, Inductor Vdrop 1.1V
- Vac ripple 3mV, previously 20mV with CRC (hopefully my sanwa meter is correct)
- Laser temp meter shows 44°C, I can put my palm on the heatsink for long time
Eventhought my chassis is only 4U, I can achieve this high bias because of room hack. I put room AC to blow on audio rack, not to the bed. I told to my wife that direct AC blow is not good for health. In fact my intention was cool down the chassis 😛
Still waiting my package for motor run cap 60uF, only paid around $2.5 each 😱
Attachments
Last edited:
Nice Aleph J.
But I would not use copper-plates or boards, no crimps and no channel-separated psus. That looks professional (but it is just copied), but it does sound ugly. I would try - before I regret in ten years or so...-(((
And NO wooden casing,-!
With frank, with best intent.
But I would not use copper-plates or boards, no crimps and no channel-separated psus. That looks professional (but it is just copied), but it does sound ugly. I would try - before I regret in ten years or so...-(((
And NO wooden casing,-!
With frank, with best intent.
Cool, that's a real good answer, in case she protests...
And I also leave my soldering iron always on, except when I go to work... But that is easy to defend, as it is less than a quarter of Aleph-J wattage...