Topology Federmann, HQQF-55 ...

Status
Not open for further replies.
Technical parameters of PS

Size 108 x 170 mm
Strength 2.5 and 3 mm
Strength Cu 75 and 105μm
Double-sided, plated
Solder mask, printing, tin plating


Technical parameters of amplifiers 4Ω

Driver HQQF-55-502D
Involvement HQQF-55-503W-4-2
End transistors 2 x 4 x IRFP240/9240
Power supply AC 230V + 2 x 48V (I recommend 300 ÷ 800W)
Cooler, thermal resistance of 0.20 ÷ 0.08 ° C / W, according to the transformer
Rectifier bridge 35 (25) A non-PS
Filtration 16 x 1m/100V (16mF ÷ 64mF)
Additional filtering capabilities block 48 x 1m/100V, separate PS
Worm Up Maximum output voltage ± 65V (46V UEF)
Burden, typically 4Ω
Power, maximum 2 x 500W (2 x 250W/8Ω)
Current protection around 17A
BOM components 4Ω!
Amplifier is to dimension the continuous maximum power transformer using 1.5 kW, which is required to use the cooler thermal resistance of 0.04 ° C / W (not recommended)



Technical parameters of amplifiers 2Ω

Driver HQQF-55-502D
Involvement HQQF-55-503W-4-2
End transistors 2 x 4 x IRFP240/9240
Power supply AC 230V + 2 x 34V (I recommend 300 ÷ 800W)
Cooler, thermal resistance of 0.20 ÷ 0.08 ° C / W, according to the transformer
Rectifier bridge 50 (35) A non-PS
Filtration 16 x 2m2/63V (35mF ÷ 140mF)
Additional filtering capabilities block 48 x 2m2/63V, separate PS
Worm Up Maximum output voltage ± 45V (32V UEF)
Burden typical 2Ω
Power, maximum 2 x 500W (2 x 250W/4Ω, 2 x 125W/8Ω)
Current protection around 35A
BOM components 2Ω!
Amplifier is to dimension the continuous maximum power transformer using 1.5 kW, which is required to use the cooler thermal resistance of 0.04 ° C / W (not recommended)



Technical parameters of amplifiers 8Ω

Driver HQQF-55-502D
Involvement HQQF-55-503W-4-2
End transistors 2 x 4 x IRFP240/9240
Power supply AC 230V + 2 x 66V (I recommend 300 ÷ 800W)
Cooler, thermal resistance of 0.20 ÷ 0.08 ° C / W, according to the transformer
Rectifier bridge 25 (35) A non-PS
Filtration 16 x 1m/100V (16mF ÷ 64mF)
Additional filtering capabilities block 48 x 1m/100V, separate PS
Worm Up Maximum output voltage ± 92V (65V UEF)
Burden typical 8Ω
Power, maximum 2 x 500W
Current protection around 8.5 A
BOM components 8Ω!
Amplifier is to dimension the continuous maximum power transformer using 1.5 kW, which is required to use the cooler thermal resistance of 0.04 ° C / W (not recommended)
 
I dedicate audio 40 years, I never disclose their topology until the last years. Here is one of my latest amplifier topology.

[IMGDEAD]http://www.federmann.cz/images/stories/Nf/HQQF/HQQF-55-503W-4-2_zapojeni-1kanal.jpg[/IMGDEAD]

after a quick inspection, I noticed the following:
1) only N-channel MOSFETs: I think, in the negative half you must use P-channel devices by the presently used driver topology
But better solution it must be, to use only N-Channel MOSFETs (to get more information, go to my link collection about
http://www.diyaudio.com/forums/soli...better-audio-non-complements-audio-power.html
2) the average connection of the potentiometer for the idle current to the base to the transistor for the variable voltage source isn't a good solution, because the max possible idle current (shorting current of your power supply) runs through the output devices in case of a pot-break. Replace your potentiometer between base and emitter and introduce a fixed resistor between collector and base to this transistor. This must be done always, not only in this case.
But the input circuit looks very interesting
 
Involvement of my drivers HQQF-55-502D, ± 100V power supply, FT transistors is more than 100MHz
HQQF-55-502D.jpg
 
Status
Not open for further replies.