Dragan changed a lot of values on the FX11, not just the 270R. Are you saying you circuit will not work as drawn? I can add the 10p easily enough on the bottom of the board. I will submit a new layout with the changes I see in Dragan's before I go any further.
FX8CD and FX11 is just idea and not tested. I must do simulation, there is some problems like rail sticking... wait with building this project...
Regards
OK I will sideline it. I am attaching the differences that I see so far.
Attachments
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those were first files - it is slightly better to use files from post http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-178.html#post4183131
there is a part list to...
SR150 + NE555 Protect + ML3 Preamp + Led VU + AX20P + XL2
OK.
It's my plan...
Stereo (2x47V DC):
SR150 + NE555 Protect + ML3 Preamp + Led VU
Subwoofer (2x59V DC):
AX20P + XL2 + Led VU
This setup will be good ?
OK.
It's my plan...
Stereo (2x47V DC):
SR150 + NE555 Protect + ML3 Preamp + Led VU
Subwoofer (2x59V DC):
AX20P + XL2 + Led VU
This setup will be good ?
Attachments
SR150 and AX20P is same power and you can use same amp for all 3 channels, I suggest SR150 there is protect on PCB no need to add NE555 Protect.
Regards
Hi ,
I have made class B amplifier .
Filter capacitors are 4 x 10 000uF +2 x 6800uF + 2 x 100nF
+- 40V , output transistors are 2SC5200 , drivers are BD139 , BD140 .
amp works !
the input is shorted , but there are oscillations and light flashes with the same frequency .
Here is a short video :
https://www.youtube.com/watch?v=5_lC8qKf0J8
Hi,
Just wanted to update on the thermal coupling, As per suggestions I changed the coupling devices and have had it now for 4 days.
The Offset has come down by a wee bit,It now stands at -2.5mv (earlier -2.8 to -3mv) on one channel and -1.8mv (earlier 2.2 to 2.4mv) on the other.
Also one thing I have noticed over the period of a month or so since the Amp was built and was to put to play,The Bias keeps decreasing.
I had kept the bias approx 81ma (27mv) and it keeps dropping to 25-26mv,I have set it multiple times but it still continues to drop,Is it normal ??
Regards.
Just wanted to update on the thermal coupling, As per suggestions I changed the coupling devices and have had it now for 4 days.
The Offset has come down by a wee bit,It now stands at -2.5mv (earlier -2.8 to -3mv) on one channel and -1.8mv (earlier 2.2 to 2.4mv) on the other.
Also one thing I have noticed over the period of a month or so since the Amp was built and was to put to play,The Bias keeps decreasing.
I had kept the bias approx 81ma (27mv) and it keeps dropping to 25-26mv,I have set it multiple times but it still continues to drop,Is it normal ??
Regards.
Attachments
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