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Old 16th December 2004, 08:13 PM   #31
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Default Thanh, if you do not use those 10 pf capacitors, i will tell you some, are you ready?

hehehe

I will remove from my amplifier too.


hohohohohô

Merry Christmas!

Carlos
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Old 17th December 2004, 12:00 AM   #32
thanh is offline thanh  Viet Nam
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Default Re: Thanh, if you do not use those 10 pf capacitors, i will tell you some, are you ready?

Quote:
Originally posted by destroyer X
hehehe

I will remove from my amplifier too.


hohohohohô

Merry Christmas!

Carlos
carlos ! added, the treble sound will be a bit increased
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Old 17th December 2004, 08:51 AM   #33
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Default Elektor crescendo 1982

If it's OK. jacco vermeulen, could you please scan and post the original crescendo article to. I built it many years ago and I have lost the shematics and the amp needs an overhaul..

Regards, Martin S.
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Old 17th December 2004, 08:51 AM   #34
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Hi guys (sorry for my bad english)
this is my first post and that amp was my first amp I build,
first I buid it with two couple of BDW83C/84C when I power on and regulate the bias i see that if I set the bias over 40mA per transistor it start to oscillate;
When I tested it with a speaker it goes into thermal runaway and selfdestroy.
I substitute the BDW with TIP142/147 and add a 10'000uF 63V capacitor per rail (total 22'000uF per rail) without C7 C8 and it function correctly.
It sound not bad, with a little emphasis to the high.
I would ask you great guru if it can deliver 100W RMS onto 8ohm with a voltage rail of 45V (that is what I'm using).

Thanks to all of you for the time spend with me.
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Old 17th December 2004, 07:18 PM   #35
guido is offline guido  Netherlands
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Went up in the attic and made some pics. It's actually the third amp i've build (and the last so far). A picture from the front with a 9v battery for reference. The case is strong, industrial stuff. You can not only dance on the music, but also dance ON the amp
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Old 17th December 2004, 07:21 PM   #36
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The back with in and outputs with standard and 'professional' plugs. I've made the thing in 1988, jesus that's half a lifetime ago...
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Old 17th December 2004, 07:22 PM   #37
guido is offline guido  Netherlands
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Another view of the amp, look at the tiny power-on switch
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Old 17th December 2004, 07:28 PM   #38
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the internals, left to right:

papst fan with the coolingtunnel, underneith it the speaker relay. two 20000uF caps with the pcb's below, two amp pcbs and the dc
protection/delay circuit (also from elektor with the counter counting back from 9 to 0. But i did not implement the led display).

on the right a 500VA ilp transformer and underneith the 'magnet-switch' for mains. you did not think i got away with the small power switch, did you
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Old 17th December 2004, 07:29 PM   #39
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just
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Old 17th December 2004, 07:31 PM   #40
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A better view on the pcb's and the cool-tunnel (what's the english expression for such a thing?). It's designed for 4 TO-3's.
The output transistors are philips and texas instruments.
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