Trying to build Aleph 30

Status
Not open for further replies.
Jump to Latest
S

space2000

Member
Joined 2008
#1
Hi,

I ever build this amp but lost after shifting house. I also forgotten many things about electronics in time. I had arranged parts for Aleph 30 including Transformer 18-0-18, signal generator and cheap Dso138 Oscilloscope.

I have completed one channel test board. it showing output 23v DC (somethings wrong), mesured Gnd + Output with multimeter DC Voltage no short in input.

I didn't use pot on R8 as it indicated 10m ohm should be fine if two input are not well matched. I have used matched mosfets. still checking for any wrong doing. Thanks
 
#4
space2000 said:
Thanks. I found the problem. Mosfet IRF9610 damaged by soldering iron as it is not Grounded. How can i avoid such incident? any tips for soldering?
Click to expand...
You will find many good video's on youtube on soldering. The main thing to remember is that whatever you are soldering has to be hot enough to melt the solder. You do not melt solder onto the parts. The same can be said about welding or brazing. Clean your tip and apply a touch of solder to the tip every time is also good advice to get a good heat transfer.
 
#6
having problem. at first, I was using BC550 instead of MPSA18 and it was fine. i was thinking that should use MPSA18 as original diagram so purchased from online MPSA18 and changed the BC550. now it is showing output as a -volt. Thanks.
 
#7
space2000 said:
having problem. at first, I was using BC550 instead of MPSA18 and it was fine. i was thinking that should use MPSA18 as original diagram so purchased from online MPSA18 and changed the BC550. now it is showing output as a -volt. Thanks.
Click to expand...

The MPSA18 has a different pin-out than the BC550. (You need to
turn it around compared to the BC550.) Is it possible you did not
account for that?

Cheers,
Dennis
 
Status
Not open for further replies.
Top Bottom