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Old 8th February 2006, 08:49 AM   #31
edl is offline edl  Hungary
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Quote:
Originally posted by mikeks
Deeply compromised design...

Yeah, I know it, but it designed for PA, and I wanted to keep it simple, using easly available parts.

Regards,
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Old 8th February 2006, 11:42 AM   #32
microchip is offline microchip  Brazil
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hello edl this is Klaus i think your circuit is really nice i like the
way you adjust dc-offset, off the critical areas (some ppl think so)if your calculations are correct it would sound really good too

Regards

Klaus PH.d
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Old 9th February 2006, 11:13 AM   #33
edl is offline edl  Hungary
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Hi,

the amp is firstly designed for MJ15003/MJ15004 output transistors. If I use 2SC5200/2SA1943, the currents could be lower, because the 2sc/2sa pair has higher gain.
Anyway the circut works fine with 2sa/2sc outputs too, but 212mA current in the second diffamp is unnecessary. We can use only for example 26mA, and than the MJE340/350 transistors shouldn't be heatsinked.
This design is not the state of art, but as I wrote, for PA purpouse its enough.
But we can keep the currents higher, with heatsinked MJE trans'. Higher current here means better quality.

If the offset isn't bigger than +/-100mV (in the most cases it not higher, but I don't matching the transistors, so it can be), the 100k resistor (that goes from the offset-circut to the input) need to be eliminated, because offset adjust is unnecessary.

Regards,
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Old 30th July 2007, 12:59 PM   #34
idealist2002 is offline idealist2002  Austria
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Hi,

Can i use anther output transistors for the SC 350? i have 4 pairs Mj15024 / Mj15025 mounted in a DIY Case.

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Old 30th July 2007, 07:45 PM   #35
east electronics is offline east electronics  Greece
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Default hello guys

seen this studio 350 and since i like so much simple constructions i wonder if i can get any more information specified about this amp .....

i ve been reading the post through ....and my applications are small pa application where power stability and capabilty on working 100% of power for many hours is the target ( often above quality )

supposed that the rest of the construction is perfect (proper trafo , caps , softstarts cooling ,ground loops and goes on ) is correct do you recoment this amp to my applications ???

thank you sakis....
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Old 30th July 2007, 07:53 PM   #36
east electronics is offline east electronics  Greece
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Default edl.....

to edl

sorry but looking at the post ....i dont get it ( ????) the 200w 2 4R is the power of the studio 350......?????

cause if it is its a joke

or is it the power of this other schematic ?????
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Old 31st July 2007, 07:12 AM   #37
sandyK is offline sandyK  Australia
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Default sc350

The Studio 350 is 200W/Ch. 8 ohms and 350W/Ch. 4 ohms

Electronics Australia no longer exists. EA copyright is now owned by Silicon Chip, who also have their back issue articles.

The Studio 350 is streets ahead of those old EA designs.

Carlos, surely you are joking about any modern amplifier with any pretensions to quality, using those slow and antiquated 2N3055/2N2955 ?

Regards
Sandyk
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