Raise psu voltage

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m60gpmg

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Joined 2002
I have intentions to build this amp because i have got 80% of the components; so, I have 3 simple questions. (see schematic)

For you is a good amp?

what kind of value c6/c7 and c11/c12 can be?

Can i use a psu of +/-68v that i already have? (in the schematic the psu has +/-56v)

regards
D.N.
 
darkfenriz

darkfenriz

Member
Joined 2004
HI
classic amp with dual diffy-should be OK.
changed rails seem to not change anything, bias will stay unchanged
i guess values of r18 & c8 are swaped
check if components will 'survive' the higher voltage!!!!
especially im not sure about transistors
for higher voltage amplification you may use smaller r13 r14
reconsider the biasing to avid crossover distortion!!!
you have 3x Vbe +Iout x0.22ohm at output stage
so i would use bigger r15 , say 15k
i'm not very much sure about caps but they seem to be compensation only:confused:
then they should be some single nanofarads or even smaller

well I may be wrong though, i am a novice so wait for professionals answering your question....

wish you luck with this project
gonna be loud
;) ;) ;)
cheers
 
Tube_Dude

Tube_Dude

Member
Joined 2002
m60gpmg said:
I have intentions to build this amp because i have got 80% of the components; so, I have 3 simple questions. (see schematic)

For you is a good amp?
Click to expand...


Yes it'is...is a clone of the Rotel RB980 BX.;)

what kind of value c6/c7 and c11/c12 can be?
Click to expand...

I will try something near 100 pF in each.

About the voltage ,do your home work and see if the transistors have breakdown voltages of 140 V for operation with 68 volts rails...and if the dissipation is not to high for them.

Arriverdeci
 
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