Power supply for LM3886

[gcds]

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:

An externally hosted image should be here but it was not working when we last tested it.

 

[troystg]

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.

 

[gcds]

if i will use lm317 for this it will be good?

 

[Netlist]

I changed your thread title to something more topic related. You soon won’t be a newbie anymore.

/Hugo

 

[troystg]

if i will use lm317 for this it will be good?

Maybe something like didi01's regulators, yes...

 

[gcds]

i selled my 600VA 35-35v and bought 600va 24-24v
i think i will use this lm317

 

[AndrewT]

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.

 

[gcds]

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.

???

 

[luka]

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.

 

[gcds]

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?

 

[yusuf]

I am building one based on carlos schematic, see here

http://www.diyaudio.com/forums/showthread.php?s=&threadid=98574

PCB in that thread is little old