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Old 16th July 2005, 06:17 PM   #11
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Nope its not because of names, it wors flawless for some and on other forums it works without problems. The server doesent really seem to want to let ppl in other countries outside europe get access.
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Old 16th July 2005, 06:52 PM   #12
audioPT is offline audioPT  Portugal
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Quote:
Originally posted by Tekko
... The server doesent really seem to want to let ppl in other countries outside europe get access.
Is Portugal outside Europe?
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Old 16th July 2005, 07:19 PM   #13
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Really: no pic...
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Old 16th July 2005, 09:17 PM   #14
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Then the server is prolly programmed not to allow linking to forums other than in sweden or norway, some ppl in denmark has problems as well. I have put the pics on another server, here they come:

The schematic:
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The module:
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A module inside:
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The amplifier in testbench:
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The amp beeing mointed in the chassis:
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Notice the starground:
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The amps backside, very ugly but as i only have dull junk tools that is the best i can do:
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Heres the amp is totally completed, tho i have changed the volume knob to a bigger one:
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And here it is in its final place:
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Due to old **** tools and a chassis that another n00b destroyed this is the best i can do. Tell me what you think, ugly or ok looking.
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Old 16th July 2005, 09:57 PM   #15
steenoe is offline steenoe  Denmark
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Quote:
i never mailed him the postage money either.
You guy's better shape up on that! Otherwise the goodwill, might drop! That would be a bad thing for this community, wouldn't it Com'on, Franz is offering these thing for you, only for the shipping cost! Franz, is always contributing, and happy to help youngsters Send him, what you owe him.
Sorry to make this rather harsh comment

Steen
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Old 17th July 2005, 12:17 AM   #16
XELB is offline XELB  Portugal
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If my calculations are correct, you have a gain of ~35.
Have you tried the STK chip with lower gain values, like 20 to 28.

I also have a STK chip, and mine performs better in lower gains.
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Old 17th July 2005, 08:34 AM   #17
Franz G is offline Franz G  Switzerland
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Quote:
How inportant is the voltage rating on a cap ? I noticed im exceeding the max of 35v om the preamp caps on this amp with one volt, they dont get hot but will it degrade them over time ?
It is not safe practices to exeed the max voltage and does shorten life of the whole circuit.

Is your multimeter exactly?

Use at least secondary fuses melting in case of a caps shortage.

Regards
Franz

P.S.
I like to see that you made an obviously good sounding amp out of this modules

P.P.S.
Did you see the "sheer horror" I made with my dremel, to remove a PMD-100 chip?

http://www.diyaudio.com/forums/showt...495#post683495
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Old 17th July 2005, 09:05 AM   #18
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The caps overvolting is behind 100 ohm resistors, its for the preamp part so if they fo poof the resistors (1/4 w) will burn out like fuses. Could overvolting cap let more ripple in than one that have like 10 volts left before its max voltage is reached ?

What would the difference be with lower gain except that i need a higher input signal for the same volume output ?

PS: i have done that too to get chips i wanned off the boards

PPS: XELB, which one do you have ?
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Old 17th July 2005, 09:16 AM   #19
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Tekko: When exceeding the spec'ed voltage there is a big difference what happens to a cheap capacitor and a good quality capacitor. It appears your caps are Marcon, which is a good solid brand. In this case your capacitor will lose some of it's marked uF value over time, when exposed to slight overvoltage. It will not blow up, and if your circuit tolerates 5000 uF instead of the marked 6800 uF, you will not be in trouble, or severely shorten the life of your amplifier.

However never exceed the surge voltage, because then any capacitor might blow up. For a 63V marked cap the typical surge voltage is 79V.

And never use a cheap ping pong capacitor anywhere near it's rated voltage, because those might just blow up after a couple of months. Max 50V for a 63V capacitor.

Anyway really one of the nicer versions of a 'chip amp'. Congratulations....
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Old 17th July 2005, 09:50 AM   #20
Franz G is offline Franz G  Switzerland
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Quote:
Steen wrote: Send him, what you owe him.
Yes, thats true! Thanks Steen!

You will still more enjoy your amp! Otherwise, many times you use your amp, you will remember not sending me the money.

This is not a good base to enjoy music, imho

Franz
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