Hello diyers!
This is actually not a chip amp, inside these modules there is a small circuit board with SMT components, transistors, resistors and caps. This will make Franz G happy to see. Tho i feel bad that i have been unable to send him his 10 euro for the shipping 🙁
Here she is in test bench and going strong 🙂
And the schemo of the test setup:
To Franz: I´ll get your payment sent as soon as i am on the bank i´ll ask for a exchange to euros.
This is actually not a chip amp, inside these modules there is a small circuit board with SMT components, transistors, resistors and caps. This will make Franz G happy to see. Tho i feel bad that i have been unable to send him his 10 euro for the shipping 🙁
Here she is in test bench and going strong 🙂
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
And the schemo of the test setup:
An externally hosted image should be here but it was not working when we last tested it.
To Franz: I´ll get your payment sent as soon as i am on the bank i´ll ask for a exchange to euros.
tekko, i guess were both culprits, i never mailed him the postage money either.🙁
btw, thise pic's are forbidden?
i dont have access to them.
-Marius
btw, thise pic's are forbidden?
i dont have access to them.
-Marius
These modules sounds really darn good. I changed the module in a amp i had that was a 4132II which had 1%THD to a 5151V that has a THD of 0.08% and slightly higher power, tho the transformer cant cope with that 10w higher power but i´ll never be at that level anyway.
The real thing
NOW i have built the real thing on a board, it took about seven hours to do. I noticed i forgot the zobel link when i hooked it up so i have to solder those on tomorrow.
Heres some pics:
Here the baby is plugged in and working like a charm:
NOW i have built the real thing on a board, it took about seven hours to do. I noticed i forgot the zobel link when i hooked it up so i have to solder those on tomorrow.
Heres some pics:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Here the baby is plugged in and working like a charm:
An externally hosted image should be here but it was not working when we last tested it.
I can't see any picture 🙁
BTW, what is the gain of the amp ? Did you use the 50x that is normally recommended in the schematic ?
BTW, what is the gain of the amp ? Did you use the 50x that is normally recommended in the schematic ?
If the pics arent working, try right click and click on show picture.
This amp sounds really good and doesent even get warm, tho the transformer i use (from a home cinema receiver) gets honking hot
Its a 450-500VA unit and its set for 240vac in.
A pic of one of these modules inside for those who is interested:
This amp sounds really good and doesent even get warm, tho the transformer i use (from a home cinema receiver) gets honking hot
Its a 450-500VA unit and its set for 240vac in.A pic of one of these modules inside for those who is interested:
An externally hosted image should be here but it was not working when we last tested it.
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 ?
Can't see any picture 🙄
Maybe it's due to the pictures names... I can't see(open) directly in the forum.
To see them, I must copy the picture url and open in a new window.
Maybe it's due to the pictures names... I can't see(open) directly in the forum.
To see them, I must copy the picture url and open in a new window.
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.
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:
The module:
A module inside:
The amplifier in testbench:
The amp beeing mointed in the chassis:
Notice the starground:
The amps backside, very ugly but as i only have dull junk tools that is the best i can do:
Heres the amp is totally completed, tho i have changed the volume knob to a bigger one:
And here it is in its final place:
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.
The schematic:
An externally hosted image should be here but it was not working when we last tested it.
The module:
An externally hosted image should be here but it was not working when we last tested it.
A module inside:
An externally hosted image should be here but it was not working when we last tested it.
The amplifier in testbench:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The amp beeing mointed in the chassis:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Notice the starground:
An externally hosted image should be here but it was not working when we last tested it.
The amps backside, very ugly but as i only have dull junk tools that is the best i can do:
An externally hosted image should be here but it was not working when we last tested it.
Heres the amp is totally completed, tho i have changed the volume knob to a bigger one:
An externally hosted image should be here but it was not working when we last tested it.
And here it is in its final place:
An externally hosted image should be here but it was not working when we last tested it.
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.
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
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.
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.
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/showthread.php?postid=683495#post683495
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 ?
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 ?
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....
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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