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Re: It didn't explode....... YET (aka niges amp)
Posted: Fri Feb 02, 2018 9:55 pm
by Fran
very neat!!
Re: It didn't explode....... YET (aka niges amp)
Posted: Sat Feb 03, 2018 11:14 pm
by nige2000
Great progress again with todays build day
congrats to all envolved
don't think anyone got any photos
if we have another good day next sat we should be pretty much done
Re: It didn't explode....... YET (aka niges amp)
Posted: Sat Feb 10, 2018 10:24 pm
by nige2000
congrats to all today
were so nearly finished
can someone remind me were the amps are
fran has two that needs light troubleshooting
ive two that need some troubleshooting and the prototype that needs front and rear panels fitted?
whos got the others?
if anyone got one without voltmeters please keep an eye on the voltages
Re: It didn't explode....... YET (aka niges amp)
Posted: Sat Feb 10, 2018 11:21 pm
by Sligolad
Fran has the first full build as well Nige so 3 in all and Tony took the other one I think.
Re: It didn't explode....... YET (aka niges amp)
Posted: Mon Feb 12, 2018 12:31 am
by Derek
I have the first full build, enjoying the music. Fran has the other two to trouble shoot. So 3 in all came with us.
Re: It didn't explode....... YET (aka niges amp)
Posted: Mon Feb 12, 2018 12:40 am
by nige2000
thats fine thats them all accounted for
head was fried last sat evening
Re: It didn't explode....... YET (aka niges amp)
Posted: Tue Feb 13, 2018 12:17 am
by Fran
it was a long and busy day!!
I have one more of the two I brought home with me fixed up, been running now about 3 hours and all seems well. I'll tackle the other one shortly but I think I know whats wrong with it. On reflection this bit of troubleshooting is completely normal and to be expected. Its been this way on every amp I've ever built.....
Fran
Re: It didn't explode....... YET (aka niges amp)
Posted: Tue Feb 13, 2018 7:30 pm
by nige2000
Ok my two here's working now,
On the faulty psu one rewired the amp chips with twisted pairs but that didn't solve the hum buzz and dc voltage
Bridged amp psu gnd and signal gnd and solved the issue
Must have been some sort of oscillation between signal and power gnd
Replaced rectifier on psu board which was a right pain in the hole
turned out the ac trace was shorted
Re: It didn't explode....... YET (aka niges amp)
Posted: Tue Feb 13, 2018 9:02 pm
by Derek
Well done Lads
Re: It didn't explode....... YET (aka niges amp)
Posted: Wed Feb 14, 2018 11:15 pm
by Fran
And I have the 3 thats here with me sorted out now. One was due to a damaged relay - it got a bit of a touch of the soldering iron, that melted the case, melted plastic was touching the contacts and stopping them closing. Even though the solenoid in the relay was clicking, the switch contacts weren't making it. You live and learn.
That means 6 working now, last few bits are now needed to finish them off. I'll give these ones here a good soak test, the one in Derek's already has this and I think Nigel's ones will get the same.
Its looking good folks!