EUVL said:
EUVL , gimme a break ;
if it works on 24 , it will work even on 27 ...... but you must always count on +10% in mains voltage . that is where is real danger , not in squible about tiny fraction of lesser performance;
if I must pay price as usual to collect knowledge in mentioned thread... that always leave bad taste in my mouth .
man can resort on L input filter if xformer in case is on high side , voltage wise .
or burn few volts in R part of CRC filter
whatever
if you wanna comment something - ask Papa why he isn't cascoded little critters
> gimme a break ;
I gave you a hint.
Please feel free to decide whether to do anything with it.
😉
Patrick
I gave you a hint.
Please feel free to decide whether to do anything with it.
😉
Patrick
My Aleph J - modified A5 PCB.
An externally hosted image should be here but it was not working when we last tested it.
Repeat of question is post 127. Any notable difference taking the usual 'fine tune dc bias' adjust resistor (68k) after the two resistors to base rather than from in between the two resistors (1.5 & 3.32)?
B.L. said:
This type of horizontal layout is really nice.
One thought, could the distance between the 2 output sections of MOSFETs be increased to better take advantage of the heatsink? Having the actual dimensions of this board would be helpful to judge.
Having space for the 2 additional output MOSFETs is a nice option for higher biased version.
In both board designs above it's great to see the input and output sections on one board rather than 3.
Just my $.02 worth.
Nice work guys.
-David
I must say that I'm not a big fan of running semiconductors at their rated limits, much less over.
Grey
Grey
GRollins said:
me too .......... but that was not a question .........
that's same as using gas toob at max current .
looking in devils eye
Wouldn't the additional mosfet's spread the load across more parts? I'd like to bias the amp to produce full power into 4 ohms rather than 8.
-David
-David
Isn't distance between output sections enough?
An externally hosted image should be here but it was not working when we last tested it.
I have some pcb´s for babelfish they are 22cm long and have C/C 5 cm between the fets.5 cm seems allright.
How long is your bord?
And where to find a schema for A5?
Hope you do some series making of those boards later..😉
How long is your bord?
And where to find a schema for A5?
Hope you do some series making of those boards later..😉
Thank you very much, Steen. Here's the latest version:
Doubled the power resistors, so 1R/2W types can be used (much easier and cheaper to get over here), added two decoupling capacitors, increased the space between the output transistors, and did some other minor modifications. Pcb is now 100 * 100mm. If anyone's interested - here's the bottom layer pdf: http://www.hb001.de/aleph_j5.pdf
An externally hosted image should be here but it was not working when we last tested it.
Doubled the power resistors, so 1R/2W types can be used (much easier and cheaper to get over here), added two decoupling capacitors, increased the space between the output transistors, and did some other minor modifications. Pcb is now 100 * 100mm. If anyone's interested - here's the bottom layer pdf: http://www.hb001.de/aleph_j5.pdf
I am curious about that too.
I had my blue aleph mini boards cascodeded briefly, and listening in mono I noticed the detail was amazing. But it went POOF the next time I turned it on, and the jumper wiring I did to cascode it was too much of a PITA to swap out the jfets, so I didn't keep the cascode.
But I am working on a cascoded aleph board -- with the intention of becoming a respectable citizen by doing away with the blue boards in my mini-a.
JJ
> Not mentioning; recommending it to the average DIY'er
Right on.
And I was trying to point out that even the device would survive the breakdown voltage, it would have so much leakage that it would no longer behave as it should.
Not that everyone cares to know ......
Patrick
Right on.
And I was trying to point out that even the device would survive the breakdown voltage, it would have so much leakage that it would no longer behave as it should.
Not that everyone cares to know ......
Patrick
