Blues-
I have recently come to learn that etching a pcb is one of the easier things to do around here.
If you can handdraw it, then scan it into the computer. Use a laser printer to print it on glossy photopaper. Iron it onto your copper clad board, then remove the paper and etch in muriatic acid available at the local hardware store. This is the basic simple process which I have condensed from Tom Gootee's website. It is much easier than, say, getting Jacco to be serious, but not quite as easy as matching bipolar transistors!
I have started working on an aleph PCB, but it will be for a cascoded J-fet.
JJ
If I design a ckt board would etch one for me?
I have recently come to learn that etching a pcb is one of the easier things to do around here.
If you can handdraw it, then scan it into the computer. Use a laser printer to print it on glossy photopaper. Iron it onto your copper clad board, then remove the paper and etch in muriatic acid available at the local hardware store. This is the basic simple process which I have condensed from Tom Gootee's website. It is much easier than, say, getting Jacco to be serious, but not quite as easy as matching bipolar transistors!
I have started working on an aleph PCB, but it will be for a cascoded J-fet.
JJ
jacco vermeulen said:...........
(usually me has finger in my ear to stop the cheese flow, why you think i'm into boats)
now you dreking our master disaster chief mod , too........
cheese ..........
Re: The lack of one 22.1k resistor?
that's R3 .
think ................. XLR ...............
Voodoo..........
xymox said:Hi !
Don't You think there is a lack of one 22.1k resistor connected between R3-C1 and the ground (as in usual aleph way of feedback net) ?
that's R3 .
think ................. XLR ...............
Voodoo..........
Lovan said:So who will be first to make som nice boards for these beauties?
You don't need to worry about.
But, not me . . .
Babowana said:
You don't need to worry about.
But, not me . . .
Baobabo ........ you're emotional again...........
Lovan said:So who will be first to make som nice boards for these beauties?
I seem to remember someone selling something similar a while back, what was it..... Babble-something....?
mpmarino said:
I seem to remember someone selling something similar a while back, what was it..... Babble-something....?
but that was "pizza & beer" (ad)venture , not a group buy ........
HBarske said:Aleph J PCB? Here ya go.
Board measures 80x100 mm, single sided, no wires. It's exactly Papa's schematic, I only left out the input coupling cap (1µ) for greater flexibility.
Comments welcome.
I like it
if you wanna use small MF resistors , make R5 from two in series ;
dissipation issue
Good hint, thx Choky. U're right, dissipates >300 mW.make R5 from two in series; dissipation issue
HBarske said:
Good hint, thx Choky. U're right, dissipates >300 mW.
if you ask me - I'll stick with two bjt CCS , even if Papa choose simpler one ;
besides better temp. behavior of two bjt version , comparing it with one bjt version, one issue is certainly important - thurn on thump must be greater - look at 10uF across zenner .
maybe I'm wrong , maybe I'm not ;
in any case - I'm sure that Papa's schematic is good enough , as always
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