Hi Peranders,
It's 1oz copper so should be fine? I've tried this board with a single trfr centre tap (rather than seperate lab supplies) and got the same results. Any ideas?
Thanks
It's 1oz copper so should be fine? I've tried this board with a single trfr centre tap (rather than seperate lab supplies) and got the same results. Any ideas?
Thanks
It might just be the photograph, but pin 7 of the 3886 looks like it is not soldered properly. Pin 7 is Gnd.
The whole board looks bad,u have cold joints for sure, I would contact prasi, he has(had)some boards for sale, very cheap.
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assembled 1 channel to see how it sounds. powered up fine without glitches first time.
Sounds very good on test speakers, used a opa2134.
here are the pics. Thanks Mr. Mile for the circuit. Am I the first one to test this particular ckt?
I might put this one in my boom box that currently uses a dayton DTA-2 class T amp.
regards
Prasi
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Dear Mr. Mile (and other members),
I have seen a lot of designs of LM3886/3875 but there are two opinions - one claims that these "Chipamps" are "rugged" and safe to use without speaker DC protection circuit. Mr. Mile loves rugged designs and always (99%) uses DC protection in his designs, but in this design I do not see it. Why?
Other claims that it should be used without compromises.
What is Your opinion/experience?
I have seen a lot of designs of LM3886/3875 but there are two opinions - one claims that these "Chipamps" are "rugged" and safe to use without speaker DC protection circuit. Mr. Mile loves rugged designs and always (99%) uses DC protection in his designs, but in this design I do not see it. Why?
Other claims that it should be used without compromises.
What is Your opinion/experience?
Boucherot resistor of apex gainclone 1.0
Boucherot resistor 4R7 1watt or 10R 0.5watt?
What should i use? I am newbie....so please explain in detail friends.
One more question....
how much supply voltage & current will be good for 8ohm & 4ohm load?
Regards.
Boucherot resistor 4R7 1watt or 10R 0.5watt?
What should i use? I am newbie....so please explain in detail friends.
One more question....
how much supply voltage & current will be good for 8ohm & 4ohm load?
Regards.
if the stage ever tries to output a high proportion of high frequencies, then the Output Zobel passes much of this and the Zobel resistor gets hot.
If you test using 10kHz (or higher) squarewave you will probably burn out a 1W Zobel resistor whenever you turn up the signal level.
For testing purposes you need at least 3W and preferably >=5W
If you test using 10kHz (or higher) squarewave you will probably burn out a 1W Zobel resistor whenever you turn up the signal level.
For testing purposes you need at least 3W and preferably >=5W
Thanks Andrew T for your kind reply.
I just want to make a simple home stereo...
not for testing purpose.
my question was....which one i should use as
jobel resistor?
The parts list and pcb top(apex gainclone 1.0)
has two different value resistor.
Parts list--4R7 1watt
Pcb top--10R 0.5watt.
And please suggest voltage and ampere rating
for 4ohm & 8ohm load both.
Off course for stereo.
Regards.
I just want to make a simple home stereo...
not for testing purpose.
my question was....which one i should use as
jobel resistor?
The parts list and pcb top(apex gainclone 1.0)
has two different value resistor.
Parts list--4R7 1watt
Pcb top--10R 0.5watt.
And please suggest voltage and ampere rating
for 4ohm & 8ohm load both.
Off course for stereo.
Regards.
Dear nirupambhowmick,
10R and 4R7 both will do the Job.
I would recommend to use 1-2 W. Sometimes 4R7 is more preferable.
10R and 4R7 both will do the Job.
I would recommend to use 1-2 W. Sometimes 4R7 is more preferable.
Hi Mr. Mile!!! I have a 30+30v AC toroidal so i need a variable PSU.
What do you suggest me?
Thanks.
What do you suggest me?
Thanks.