I reread the output of irf3205:
G: 9 volts dc: 12volts dc S: 0 volts dc
irf9540: g: 14 volts dc d: 27volts dc s: 27volts dc
the MUR1620CT did not clean out cuicuit
reread: pin 1 5volts Ac pin2 28volts Dc pin 3 5 volts Ac
(sorry I did a copy pasted with google translation and irf3805 replaced irf9540)
G: 9 volts dc: 12volts dc S: 0 volts dc
irf9540: g: 14 volts dc d: 27volts dc s: 27volts dc
the MUR1620CT did not clean out cuicuit
reread: pin 1 5volts Ac pin2 28volts Dc pin 3 5 volts Ac
(sorry I did a copy pasted with google translation and irf3805 replaced irf9540)
I have all desoldering
check all the components
the mur1620ctr hs change
the lm317 hs change
I have all welded
new measure voice by voice:
B + 13Vdc
black probe on B-
no fuse burn
current 1 amp
Q110 irf540: 1: -28Vdc 2: 0Vdc 3: -28 Vdc
Q111 irf9540: 1 + 28Vdc 2: 0v dc 3: + 28Vdc
Q210 irf540: 1 -28Vdc 2: 0Vdc 3: -28Vdc
Q211 IRF9540: 1 + 28VDC 2: 0VDC 3 + 28VDC
Q311irf9540: 1 + 28Vdc 2: -28Vdc 3: + 28Vdc very hot
Q310 irf540: 1-28Vdc 2: -28Vdc 3: -28Vdc very hot
Q411 irf9540: 1 + 28Vdc 2: 0Vdc 3: + 28Vdc
Q410 irf540: 1: -28Vdc 2: 0Vdc 3: -28Vdc
U3 lm317: 1: 13Vdc 2: 14Vdc 3: 27Vdc
D8 mur1620tc: 1: -5 Vac 2: + 27Vdc 3: + 5Vac
U4 lm337: 1: -12Vdc 2: -28Vdc 3-13Vdc
D9 mur1620ctr: 1: 5Vac 2: -28Vdc 3: 5Vac
Q6 irf3805: + 5.8Vdc 2: + 12.85Vdc 3: 0Vdc
Q8 irf3805: +5 Vdc 2: + 14Vdc 3: 0Vdc
Q7: irf3805: + 5Vdc 2: 13Vdc 3: 0Vdc
Q5 irf3805: + 5Vdc 2: + 13Vdc 3: 0Vdc
I have a speaker output the 3 that comes out 27 Vdc
(sorry translated with google)
check all the components
the mur1620ctr hs change
the lm317 hs change
I have all welded
new measure voice by voice:
B + 13Vdc
black probe on B-
no fuse burn
current 1 amp
Q110 irf540: 1: -28Vdc 2: 0Vdc 3: -28 Vdc
Q111 irf9540: 1 + 28Vdc 2: 0v dc 3: + 28Vdc
Q210 irf540: 1 -28Vdc 2: 0Vdc 3: -28Vdc
Q211 IRF9540: 1 + 28VDC 2: 0VDC 3 + 28VDC
Q311irf9540: 1 + 28Vdc 2: -28Vdc 3: + 28Vdc very hot
Q310 irf540: 1-28Vdc 2: -28Vdc 3: -28Vdc very hot
Q411 irf9540: 1 + 28Vdc 2: 0Vdc 3: + 28Vdc
Q410 irf540: 1: -28Vdc 2: 0Vdc 3: -28Vdc
U3 lm317: 1: 13Vdc 2: 14Vdc 3: 27Vdc
D8 mur1620tc: 1: -5 Vac 2: + 27Vdc 3: + 5Vac
U4 lm337: 1: -12Vdc 2: -28Vdc 3-13Vdc
D9 mur1620ctr: 1: 5Vac 2: -28Vdc 3: 5Vac
Q6 irf3805: + 5.8Vdc 2: + 12.85Vdc 3: 0Vdc
Q8 irf3805: +5 Vdc 2: + 14Vdc 3: 0Vdc
Q7: irf3805: + 5Vdc 2: 13Vdc 3: 0Vdc
Q5 irf3805: + 5Vdc 2: + 13Vdc 3: 0Vdc
I have a speaker output the 3 that comes out 27 Vdc
(sorry translated with google)
Hello
all the resistors r135 r148 r248 r235 r335 r348 r448 and r435 the same value 10 ohm
for the measurement of the bipolar I removed them from the cuicuit:
Q308 npn: CE + - OL. EC: - + 0.65V. EB: - + OL. CB: - + OL (HS)
Q309 pnp: CE + - OL. CE: - + OL. CB: + - 0.65V. BE: - + 0.65V (good)
all the resistors r135 r148 r248 r235 r335 r348 r448 and r435 the same value 10 ohm
for the measurement of the bipolar I removed them from the cuicuit:
Q308 npn: CE + - OL. EC: - + 0.65V. EB: - + OL. CB: - + OL (HS)
Q309 pnp: CE + - OL. CE: - + OL. CB: + - 0.65V. BE: - + 0.65V (good)
sorry for waiting component out of stock
mpsa06 mounted the amp starts
4 outputs work without distortion
fuse ok
the irf are hot
how does one regulate the bias?
my supplier offered me equivalents for the same price:
obsolete irf9540: equivalent irf5210
obsolete irf540: equivalent irf3415
mpsa06 mounted the amp starts
4 outputs work without distortion
fuse ok
the irf are hot
how does one regulate the bias?
my supplier offered me equivalents for the same price:
obsolete irf9540: equivalent irf5210
obsolete irf540: equivalent irf3415
The replacement output transistors are rarely identical (operating parameters) to the originals so you virtually always have to readjust the bias.
This how I adjust it:
http://www.bcae1.com/temp/ausettingbias.swf
This how I adjust it:
http://www.bcae1.com/temp/ausettingbias.swf
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