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Old 5th May 2010, 06:44 AM   #31
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Default I will be happy with your pictures, as i knew you are producing using the real DIY

The spirit..... alike me, you gonna be one more rarity... now a days people order from factories or etch using photographic/chemical method.... old style was almost abandoned...some few guys still uses.

Mine boards, sometimes are point to point... a big mess.

Do you know what i think?.... if an amplifier operates this way, without oscilations, we do not need to worry too much about board layout...because the amplifier proved to be stable...not oscilating after this kind of terrible construction, will not oscilate when assembled in a decent board.

The one resulted better in sonics was this blue/gray one you see at your left... the schematic is old, from the Dx Blame ES.... having a lot of capacitors that use to slow down the circuit and result the ugliest think i have ever done...absolutelly awfull...but it is beating decent boards...not good to see...excelent to listen too...i had not courage to dismount the mess... supply is not decent too... transformer has huge voltage drop...even this way..the best unit i have .... and i have several Dx Blame ES and ST at my home.... parts selection counts too.... they sound a little bit different..even the two ones using the same board (some small differences matters)

These constructions were made by a man...the ones have not that brigth in the eyes.... macho style...no pink shoes, no hair styling emulsion...no perfum...no nail polish, no batton, no solar filter, not shaved. a male working...had sweat smell....a man you know..the one has strong voice and knowledge how to catch a woman going straigth to the point, not letting room to any doubt about his intentions (to attack and dominate)..... masculine style... without worries if pretty or handsome.... this is what means our board style, honoring the 100 women we had in this life.


Ahahahahahha!

regards,

Carlos


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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 5th May 2010 at 07:07 AM.
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Old 5th May 2010, 12:14 PM   #32
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by sng001 View Post
R17 & R22 (33R) - these are the rail resistors, 0.25W can carry 7mA safely, so I went for for 1W.
indeed the 0.25W can carry 7mA safely. That is a dissipation of 1.6mW.
The rated maximum current for a 33r 250mW resistor is 87mA. That will make it run hot.
It is usual to reduce the maximum continuous current to about 70% of maximum, i.e. 60mA. dissipation limit of 123mW.
Your 7mA is just 1.3% of this reduced continuous current limit.

Why adopt 1W when 7mA will be just 0.16% of rated maximum dissipation?
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Last edited by AndrewT; 5th May 2010 at 12:44 PM.
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Old 5th May 2010, 12:37 PM   #33
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Default No need to increase resistance size (dissipation)

As AndrewT said....it is within the safe limits.

regards,

Carlos
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Old 5th May 2010, 05:12 PM   #34
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By now I am placing the transistors, after soldering almost all resistors, capacitors, jumpers et al. I got a bit upset while matching the BD's. Some of them had a gain laid in the 200-220 range. Others stayed under 160! I have even found others near 60 (these certainly from neighbor country ".py"). Could anyone discuss about this issue? What range of gain should be elected for the BD's, especially the output drivers? Thanks a lot.
Max.
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Old 5th May 2010, 06:44 PM   #35
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Default From a 50 to 220 will be fine..try to match the PNP with the NPN

this is difficult, but try the nearest ones in gain.

Usually the PNP (BD140) has more gain than the NPN...just reduce differences between them while selecting devices.

Pega os mais próximos e não esquenta.... take the nearest ones and do not mind about.

regards,

Carlos
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Old 5th May 2010, 11:12 PM   #36
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I finished my board layout all except for three (not one) hole.... it was fun drilling all 100 and some odd holes...

I'm going to start dry placing in all the parts i currently have (Or i might tin the traces), The possibility's are endless. I currently don't have any of the transistor or any of the high wattage resistors (Or even the high voltage capacitors).

If I'm not to lazy ill post some pictures

Last edited by KnightofAwesome; 5th May 2010 at 11:26 PM. Reason: Three not one
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Old 6th May 2010, 12:56 AM   #37
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Default Thank you KnigthofAwsome...pictures will be very welcome

good luck,

regards,

Carlos
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Old 6th May 2010, 04:38 AM   #38
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Default Got around to it

Here's some pictures that i have of the parts (the little amount that i have) and the board layout in all its messy glory... Oh yes, and a solar bug , little thing has been creeping in my crawl space!

You might not be able to see it in the pictures, but i have in fact missed four holes that i haven't drilled (and three extras on the ground track).

Cheers,
Kurtis
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Old 6th May 2010, 01:10 PM   #39
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Default It is very good to see you are preparing yourself to build

Board is ready...so....need to select parts.....nice pictures.

thank you,

regards,

Carlos
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Old 6th May 2010, 01:17 PM   #40
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very happy to say that a few greek friends are allready working on the construction ...the subject is presented also in a greek speaking forum and any day i will redirect pictures of the amps

anyday i am going also to "come in" with mine ...but too busy to produce it right now

regards sakis
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