Hi,
the bias resistor needs to be changed to a temperature compensating bias voltage. Diodes on the main heatsink or Vbe (Vgs) multiplier. A dual complementary Vgs multiplier as Borbely may be the best option.
The input cap seems a bit small RC = 33mS.
The LTP current seems a bit low about at about 760uA, only 380uA per leg if balanced.
Gate source zeners direct across the FET legs would be better maybe 7V to 9V then the 220r current limits the zener on overload. But it still won't survive a short circuit. Needs short protection on the VAS transistors.
Leave an extra route for the Hi Frequency feedback capacitor to the bases of the inverting LTP pairs. and maybe space for an RC combination in // to the 47pF
The rest of the circuit seems well designed, e.g. good separation of power and signal grounds.
the bias resistor needs to be changed to a temperature compensating bias voltage. Diodes on the main heatsink or Vbe (Vgs) multiplier. A dual complementary Vgs multiplier as Borbely may be the best option.
The input cap seems a bit small RC = 33mS.
The LTP current seems a bit low about at about 760uA, only 380uA per leg if balanced.
Gate source zeners direct across the FET legs would be better maybe 7V to 9V then the 220r current limits the zener on overload. But it still won't survive a short circuit. Needs short protection on the VAS transistors.
Leave an extra route for the Hi Frequency feedback capacitor to the bases of the inverting LTP pairs. and maybe space for an RC combination in // to the 47pF
The rest of the circuit seems well designed, e.g. good separation of power and signal grounds.
!!!
Here is a link:
http://www.bas.abshost.net/mojiprojekti1.html
Go on "pojacala" and than on Goliath or another amplifier
The bias resistor is now 1k.
Here is a link:
http://www.bas.abshost.net/mojiprojekti1.html
Go on "pojacala" and than on Goliath or another amplifier
The bias resistor is now 1k.
With all this stuff coming from Serbia and Croatia maybe i should make an effort to learn to read the language.
I am really looking forward to the details of the 60watt class A amplifier(on the power amplifier current project list).
Using L-brackets to couple drivers and output Hitachi Mosfets is a very original idea, Sigma amplifier.
I have been thinking of building Dr. Jagodic's SMPS.
High time DIYaudio had a special thread for links to pages like the one from Dr. Jagodic.
I am really looking forward to the details of the 60watt class A amplifier(on the power amplifier current project list).
Using L-brackets to couple drivers and output Hitachi Mosfets is a very original idea, Sigma amplifier.
I have been thinking of building Dr. Jagodic's SMPS.
High time DIYaudio had a special thread for links to pages like the one from Dr. Jagodic.
Re: !!!
/Hugo
What speakers are you going to use?viktor1986 said:Please Goliath or Legend?
/Hugo
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