HIRAGA LE CLASS A 30 W

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On en parle n°34 : modifs ampli Hiraga 20W, tweeter technics 5HH10 ...

83.JPG
 

jeepy

Member
2010-02-07 9:59 am
Note: If you have efficient speakers (min. 92db) the 20W version (the original one) will allow you to cut by two the price of the capacitors!
Per rail: 68 000 + resistor + 330 000 + 330 000 for the 30W
Per rail: 33 to 47 000 + resistor + 68 000 + 68 000 for the 20W
Transformer = 400VA for the 30 W(+/-24V DC) , 300 VA for the 20W (+/- 21V DC)
Also be aware that with 1 Amp bias and 21-24 v, The first cap will receive PDC (pulsed direct current) pics of 30 to 40 amperes. Diode rectifiers should be dimensionned accordingly and first cap should not be low ESR, with lower value than the second stage.
The Power supply is critical with this simplistic design! You are welcome if you need further details!


HI,

my wonderful amp has - i suppose - melted power transistors.
Anyone is so kind to post the complete schematic of this fantastic amp? :eek:

Very Thanks for reading

Cheers,

Paolo ,
Venezia - ITALY

Phaseless Speakers
 

jeepy

Member
2010-02-07 9:59 am
Note: If you have efficient speakers (min. 92db) the 20W version (the original one) will allow you to cut by two the price of the capacitors!
Per rail: 68 000 + resistor + 330 000 + 330 000 for the 30W
Per rail: 33 to 47 000 + resistor + 68 000 + 68 000 for the 20W
Transformer = 400VA for the 30 W(+/-24V DC) , 300 VA for the 20W (+/- 21V DC)
Also be aware that with 1 Amp bias and 21-24 v, The first cap will receive PDC (pulsed direct current) pics of 30 to 40 amperes. Diode rectifiers should be dimensionned accordingly and first cap should not be low ESR, with lower value than the second stage.
The Power supply is critical with this simplistic design! You are welcome if you need further details!
 

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