Pavel
That was my next question 😉
I will continue the layout using a 10*30 mm aluminium "prism".
That was my next question 😉
I will continue the layout using a 10*30 mm aluminium "prism".
Continue : Basic lengh of this PCB is for two transistors and next lengts are multiples of basic ( PCB must have cutoffs for transistors ). Standard prism is made by aluminium or copper, high end version with supersound by goldplated copper 😀 .
Pavel
I'm not quite sure what you meen by "( PCB must have cutoffs for transistors )"
Do you meen cutoffs for each set of two transistors???
I'm not quite sure what you meen by "( PCB must have cutoffs for transistors )"
Do you meen cutoffs for each set of two transistors???
Yes, sure. PCB is screwed to prism on the beggining of prism, next is cutoff for two transistor and on the end again screwing to prism. This is " basic length " and it is multipled n-times. Across the screw come current from PCB to prism. Is this clear now ? 😉
P.S. : Current from prism to transistors come directly to bootom side of transistor, not to colector pin, so you don't need feeder on PCB.
P.P.S. : Make this PCB common for both polarity - who will can, may this cut on axis ( on output " line " ). This solution have advantage, 'cos you can try it " burn " outside of chassis, free on table.
Pavel
I understand the part about common PCB polarity layout 😉
However this part I don't get "who will can, may this cut on axis ( on output " line " )"
I understand the part about common PCB polarity layout 😉
However this part I don't get "who will can, may this cut on axis ( on output " line " )"
My last ( I hope 😉 ) notice : In the prism must be also hole, inside which is insulated screw, by which is prism screwed to heatsink. Best place for it is common coaxial hole ( on PCB and prism ) on beginning and end of basic lengh, beside hole for " current connection ".
Pavel
I understand the part about common PCB polarity layout 😉
However this part I don't get "who will can, may this cut on axis ( on output " line " )"
I understand the part about common PCB polarity layout 😉
However this part I don't get "who will can, may this cut on axis ( on output " line " )"
If anybody has problems to get the transistors wich are not from Onsemi (2SC3955, 2SC2240 and 2SA970, i found a supplyer in Holland (NEDIS). These transistors are cheap.
In the partlist are resistorvalues that can't be bought (shops dont sell them. Can i take the closest value for it?
Onother question, what are ZD101 and ZD102 (ZD9841)? google dont know them, and my local internetstores dont know them too.
Are there substitutes?
In the partlist are resistorvalues that can't be bought (shops dont sell them. Can i take the closest value for it?
Onother question, what are ZD101 and ZD102 (ZD9841)? google dont know them, and my local internetstores dont know them too.
Are there substitutes?
win
Sounds fine... Lets have some prices 😉
I have specified the original resistor values, which of some are quite special.... If you buy a handful of resistors at the nearest desired value, you might be able to find some very near the stated value using a standard multimeter 😉
However 100R or 101R doesn't make a difference, however you will get a better amp if you match all resistors 😉
As I recall, the Zeners are 24V (is that right??)..... Get some standard 2W zener, and it should work perfectly... 😉
Sounds fine... Lets have some prices 😉
I have specified the original resistor values, which of some are quite special.... If you buy a handful of resistors at the nearest desired value, you might be able to find some very near the stated value using a standard multimeter 😉
However 100R or 101R doesn't make a difference, however you will get a better amp if you match all resistors 😉
As I recall, the Zeners are 24V (is that right??)..... Get some standard 2W zener, and it should work perfectly... 😉
Here is an Output Board that should satisfy most 😉
Later will come 2 more in different layouts 😉
One will be after Pavel's design suggestions
Later will come 2 more in different layouts 😉
One will be after Pavel's design suggestions
Prices from the "not Onsemi" transitors, inclusive VAT.
Dealer is Nedis (internatioal dealer) Prices in Euro from website Nedis Netherlands:
2SC2240:
quantum 5 25 40
price each 0,29 0,18 0,12
2SA970:
quantum 10 30 60
price each 0,17 0,1 0,07
2SC3955:
quotum 2 18 35
price each 0,75 0,51 0,36
Dealer is Nedis (internatioal dealer) Prices in Euro from website Nedis Netherlands:
2SC2240:
quantum 5 25 40
price each 0,29 0,18 0,12
2SA970:
quantum 10 30 60
price each 0,17 0,1 0,07
2SC3955:
quotum 2 18 35
price each 0,75 0,51 0,36
Nedis
Hi Wim, I don't want to spoil the fun but Nedis is notorious for delevering faked parts and second sourced parts......Or even no-name parts.
BEWARE!
wim said:
Hi Wim, I don't want to spoil the fun but Nedis is notorious for delevering faked parts and second sourced parts......Or even no-name parts.
BEWARE!
Thanks Elso, for this intresting info!!!
I did not know that.
No way tot see or the parts are real or fake i gues?? Than i drop mines in the ashtray and look for anoter supplier.
I did not know that.
No way tot see or the parts are real or fake i gues?? Than i drop mines in the ashtray and look for anoter supplier.
