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#1 |
diyAudio Member
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I dedicate audio 40 years, I never disclose their topology until the last years. Here is one of my latest amplifier topology.
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#2 |
diyAudio Member
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Site photos
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#3 |
diyAudio Member
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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) |
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#4 |
diyAudio Member
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I always look at the amplifier's own eyes. I described the causes Transistor sound here.
Federmann Bohumil. Tranzistorový zvuk počítačové simulace příčin jeho vzniku. Perspektivy elektroniky v roce 2009: 26. 3. 2009. Rožnov pod Radhoštěm: SŠIEŘ RPR, 2009, s. 19-25. ISBN 978-80-254-4052-0. Please add your experiences. |
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#5 |
diyAudio Member
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i notice there are emitter followers to drive all those output mosfets. therefore, i'm curious about the distortion versus frequency performance.
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#6 |
R.I.P.
Join Date: Dec 2001
Location: Schaffhausen Switzerland
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Milloyd,
Where are the emitter followers you mention? I can't see any EFs ANYWHERE in his circuit in Post #1. Regards, Allen (Vacuum State) |
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#7 |
diyAudio Member
Join Date: Apr 2002
Location: Prague
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I would like to see measured distortion plots vs. frequency and amplitude as well, into 4 ohm.
__________________
Pavel Macura http://pmacura.cz/audiopage.html http://pmacura.cz/DIY_250W_4ohm_amplifier.html |
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#8 |
diyAudio Member
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#9 | |
diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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Quote:
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/solid...dio-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 |
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#10 |
diyAudio Member
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Involvement of my drivers HQQF-55-502D, ± 100V power supply, FT transistors is more than 100MHz
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