Great, it is a very good sounding stage so it is worth the effort. Mercedes Sosa disappeared out of no reason. I am conducting a search right now.
Sorry no progress today did not wake up till phone rang at 5 PM
So now on works puter till 8 Am
But 4 days off camming up...
Holes>
As is wery much home brew I keep holes at 0.5 mm troug out
Make nice pilot for the Dremmel and as everiting home brew can be changed at any time Just swap drill bits in this case.
very interested your SOMMERWIND speakers because i like 30cm woofer,when will finished?🙂
I am working on a preamplifier. D.Self inspired me again with his preamp for Elektor.
I simplfied a bit, for example i took out the tone control. At the input i substituted a real INA and the output stage i had alraedy build in my JG-Self with a discrete buffer and the LME49713HA.
This has simply to be redesigned for the new 1kOhm pot and i made a new discrete buffer that does not need P-channel J-Fets. Also the massive paralleling is not necesarry because the buffer and the LME49713 are very low noise anyway.
I simplfied a bit, for example i took out the tone control. At the input i substituted a real INA and the output stage i had alraedy build in my JG-Self with a discrete buffer and the LME49713HA.
This has simply to be redesigned for the new 1kOhm pot and i made a new discrete buffer that does not need P-channel J-Fets. Also the massive paralleling is not necesarry because the buffer and the LME49713 are very low noise anyway.
My design does not use coupling caps and there is a direct output behind the INA when you do not need voltage gain. The INA can be of cause arranged for gain so the output stage is really not necessarry. In my design it makes a nice hedaphone amp though.
I went back to a discrete INA. In internal 6kOhm resistors stop me from getting the lowest noise.
I have pre view of stuffed (partially as one seems to run out of components alla time)
Pre regulator board.
This is with non-spec common mode cokes and 15 mm footprint capacitors on filter (before diodes)
Also different capacitors at output this just to give an indication of possible different type that can be used in that limited space.
I had a heath sink from different project that came handy for photo shoot
If is needed great if not there is even more space.
Board size is 160 X 100
No need to say that if you give me precise components foot prints I will be more than hapy to modify the design and make a few protos for testing
Pre regulator board.
This is with non-spec common mode cokes and 15 mm footprint capacitors on filter (before diodes)
Also different capacitors at output this just to give an indication of possible different type that can be used in that limited space.
I had a heath sink from different project that came handy for photo shoot
If is needed great if not there is even more space.
Board size is 160 X 100
No need to say that if you give me precise components foot prints I will be more than hapy to modify the design and make a few protos for testing
Attachments
Looks cool, maybe to cool 🙂
For anything up to a few amperes you will not need a heat sink (especially not for the TO220 devices).
For anything up to a few amperes you will not need a heat sink (especially not for the TO220 devices).
I woold realy like to make this as cool as possible.
About sinks I agree as they are not needed for low amps but board space need only 20 mm to fit them so option is there.
Another thing I was thinking of was to put Cokes on output side as well.
If I get final specs for components and maybe, as I could not get them the proper cokes, I will send you a couple of proto boards.
I am vondering what shuld be the rating of the resistors (at the moment I have 4.7R 1Watt) maybe 2 in paralell be better?
For the proper ones I got same 75 microns PCB just waiting to take acid bath
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Looks good. Lets think about the specs we need for the Pardise. Heseners boards are playing without problem so it can be done.
Tanks Joachim.
By any chance could you or whos got them send the 2 cokes.
I like to get the real component to fit on the board exactley before I go for the proper designed one
I will Paypall
By any chance could you or whos got them send the 2 cokes.
I like to get the real component to fit on the board exactley before I go for the proper designed one
I will Paypall