Is this Mosfet amp(see the attached file) a simple good amp?
What do you think about it?
100W 8 Ohm +/-50V
components:
R1: 2,2 Kohm
R2: 47 Kohm
R3: 47 Kohm
R4: 3,9 Kohm
R5: 3,9 Kohm
R6: 1 Kohm
R7: 33 Kohm
R8: 12 Kohm 1 Watt
R9: 100 ohm
R10: 100 ohm
R11: 47 ohm
R12: 100 ohm
R13: 220 ohm trimmer m.o. p.5
R14: 100 ohm
R15: 100 ohm
R16: 100 ohm
R17: 4,7 ohm 2 Watt
(I resistori sono da 1/4 watt 5%
salvo diversa indicazione)
C1: 10 µF 50 V elettrolitico rad.
C2: 47 pF ceramico
C3: 47 µF 50 V elettrolitico rad.
C4: 6,8 nF ceramico
C5: 33 pF ceramico
C6: 33 pF ceramico
C7: 100 nF 100 V poliestere
C8: 220 µF 50 V elettrolitico rad.
C9: 100 nF multistrato
C10: 220 µF 50 V elettrolitico rad.
C11: 100 nF multistrato
What do you think about it?
100W 8 Ohm +/-50V
components:
R1: 2,2 Kohm
R2: 47 Kohm
R3: 47 Kohm
R4: 3,9 Kohm
R5: 3,9 Kohm
R6: 1 Kohm
R7: 33 Kohm
R8: 12 Kohm 1 Watt
R9: 100 ohm
R10: 100 ohm
R11: 47 ohm
R12: 100 ohm
R13: 220 ohm trimmer m.o. p.5
R14: 100 ohm
R15: 100 ohm
R16: 100 ohm
R17: 4,7 ohm 2 Watt
(I resistori sono da 1/4 watt 5%
salvo diversa indicazione)
C1: 10 µF 50 V elettrolitico rad.
C2: 47 pF ceramico
C3: 47 µF 50 V elettrolitico rad.
C4: 6,8 nF ceramico
C5: 33 pF ceramico
C6: 33 pF ceramico
C7: 100 nF 100 V poliestere
C8: 220 µF 50 V elettrolitico rad.
C9: 100 nF multistrato
C10: 220 µF 50 V elettrolitico rad.
C11: 100 nF multistrato
Attachments
That is the 'industry standard' MOSFET amp as designed by Hitachi when MOSFETs first became readily available. It has been cloned a thousand times, both commercially and DIY. It performs well, but there are improvements/better alternatives available nowadays.
no, ratu!
220uF is the correct value as these caps are only for local/close decoupling. PSU smoothing caps are to be used in addition and these should be like you said.
220uF is the correct value as these caps are only for local/close decoupling. PSU smoothing caps are to be used in addition and these should be like you said.
richie00boy said
"That is the 'industry standard' MOSFET amp as designed by Hitachi when MOSFETs first became readily available. It has been cloned a thousand times, both commercially and DIY. It performs well, but there are improvements/better alternatives available nowadays."
We r intersted in this type of schematics and more info.
MP
"That is the 'industry standard' MOSFET amp as designed by Hitachi when MOSFETs first became readily available. It has been cloned a thousand times, both commercially and DIY. It performs well, but there are improvements/better alternatives available nowadays."
We r intersted in this type of schematics and more info.
MP
palesha said:
If you google for "FET amplifier circuit" or similar terms you get plenty of those and similar schematics. Also here in the forum you can find several examples.
richieboy
Ok! if it´s only for decoupling, remember to put it as close as posible to te power mosfets.
Ratu
Ok! if it´s only for decoupling, remember to put it as close as posible to te power mosfets.
Ratu
Cybergent said:
Like this one 🙂
http://www.diyaudio.com/forums/showthread.php?s=&threadid=19626&highlight=
Tony.
T1,T2
It is very iportant that you buy many mirror transistors(10 or 20 units of T1 and T2) and measure the hfe of each one, try both which have the same hfe and in the case that you have many, try the maximum value of hfe.
This is aplicable for all mirror transistors!
RATU
It is very iportant that you buy many mirror transistors(10 or 20 units of T1 and T2) and measure the hfe of each one, try both which have the same hfe and in the case that you have many, try the maximum value of hfe.
This is aplicable for all mirror transistors!
RATU
ratu said:
Thanks for the tip Ratu 🙂 Since these are really cheap transistors (the bc556 anyway), I think I'll give that a try! The 10 off price on the bf469's is about $2.60 each though 🙁
Tony.
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