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Old 10th March 2007, 09:22 PM   #1
gcds is offline gcds  Lithuania
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Default newbay questions

hi, am newbay here. so i have 600VA 35-35v teroid transform
i think i will use this for 6 channel lm3886 for each channel
i will use this schematic it easy but i dont know how to design good PSU schematic

HERE lm3886 schematic:
Click the image to open in full size.
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Old 10th March 2007, 09:36 PM   #2
troystg is offline troystg  United States
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I hate to spoil the plans, but 35 volt secondaries (AC) are too high for a gain clone. That will give you 49 volt DC rails and the GC's require 20-96 volts.. Anything over 35 VDC is going to be hot for them.
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Old 11th March 2007, 06:08 PM   #3
gcds is offline gcds  Lithuania
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if i will use lm317 for this it will be good?
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Old 11th March 2007, 06:12 PM   #4
Netlist is offline Netlist  Belgium
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I changed your thread title to something more topic related. You soon won’t be a newbie anymore.

/Hugo
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Old 11th March 2007, 06:30 PM   #5
troystg is offline troystg  United States
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Quote:
Originally posted by gcds
if i will use lm317 for this it will be good?

Maybe something like didi01's regulators, yes...
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Old 11th March 2007, 11:20 PM   #6
gcds is offline gcds  Lithuania
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i selled my 600VA 35-35v and bought 600va 24-24v
i think i will use this lm317
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Old 12th March 2007, 09:38 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi,
with the 24-0-24Vac transformer, do not buy 4ohm speakers.
The chipamp will run 8ohm speakers OK and should be able to drive 6ohm or 4 to 8ohm but you must be careful to keep the chipamp cool if using these lower impedance loads.

There is no RF filter on pin10 try adding 330pF to 1nF to attenuate the above audio frequencies.
The capaitor c7 is a bit small for low bass response. Try using 100uF to 150uF //1uF plastic film.
There is no DC blocking capacitor on the input. If your source has a blocking cap then OK, but if you parallel two power amps then all except one MUST have a DC blocking cap, or preferably, all of them.

My advice:- forget regulation until you become expert at designing amplifiers.
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Old 12th March 2007, 02:54 PM   #8
gcds is offline gcds  Lithuania
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Quote:
If your source has a blocking cap then OK, but if you parallel two power amps then all except one MUST have a DC blocking cap, or preferably, all of them.

???
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Old 13th March 2007, 08:56 AM   #9
luka is offline luka  Slovenia
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Hi

Blocking cap is what prevents input DC voltage offset get to output(amplified). If you dont have it, and you have let say +2v od DC voltage on input, you will get 2 x gain (10, 20 or whatever you have set it) = a lot of DC voultage on output and this will destroy any speaker.
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Old 19th March 2007, 08:42 PM   #10
gcds is offline gcds  Lithuania
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Quote:
The capaitor c7 is a bit small for low bass response. Try using 100uF to 150uF //1uF plastic film.
so u cab use 1uf plastic?
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