no less than 10 identical posts , posted in 10 different threads ......
seems that you are extremely happy , in same time finding most impressive way of social bonding .....
edit:
to make you completely and nonquestionable happy - -here is your picture
Attachments
Last edited:
Nothing like the smell of fat Hitachi TO126's in the morning.
(Mamak already got a haircut, i suppose ?)
(Mamak already got a haircut, i suppose ?)
Gentlemen,
Finally I am going to put the
to work. I am building it into its final case right now. Before closing the thing I have been running some more tests with Shuntys only and 470R as load.
Unfortunately R21,R22 keep "blowing" - they are actually not burned, just R is > 2M. My first attempt was 1R8 1/4W noname according to notes in the cook book, then I used 2R 1W Vishay metal film. They just died 5 minutes ago when I switched of/on the third time (It always happens when I switch it on). Both channels at the same moment. I use low ESR Rubycon caps and a 42V 250VA EI transformer...
What could I do?
Thanks
Sven
Finally I am going to put the
to work. I am building it into its final case right now. Before closing the thing I have been running some more tests with Shuntys only and 470R as load.Unfortunately R21,R22 keep "blowing" - they are actually not burned, just R is > 2M. My first attempt was 1R8 1/4W noname according to notes in the cook book, then I used 2R 1W Vishay metal film. They just died 5 minutes ago when I switched of/on the third time (It always happens when I switch it on). Both channels at the same moment. I use low ESR Rubycon caps and a 42V 250VA EI transformer...
What could I do?
Thanks
Sven
An externally hosted image should be here but it was not working when we last tested it.
I took carbon types and had no problem.....your no name were carbon resistors?
And what about the advice of Zen to take MOX 1watt
But I suppose Zen will answer soon.....🙂🙂🙂
What a wonderful arrangement!!!!
And what about the advice of Zen to take MOX 1watt
But I suppose Zen will answer soon.....🙂🙂🙂
What a wonderful arrangement!!!!
you have two solutions , obviously ;
1. either toss those Ruby's out .........
2. or keep changing resistors ; put some fuse holders in their place , to ease that change ........
or ....... maybe you can decrease them in value , 'till they start to survive powering up
I have to admit "shooting it" was among my first thoughts, however that is satisfactory only at a very very short term 😉.
Ex post praying did not work, so I guess will have to actually put other resistors. The fuse socket is not such a bad idea since these PCBs clearly have been designed to solder ONCE and then never again 🙄😉.
I don't really know how much current runs through these resistors during startup and why 1W is not enough - I already halved the value. Without much experimenting - bear in mind frequent soldering/desoldering is not the best thing to do to these PCBs
- what should I use? 1/2W Carbon 2R? Generg mentioned MOX?
Regards
Sven
Ex post praying did not work, so I guess will have to actually put other resistors. The fuse socket is not such a bad idea since these PCBs clearly have been designed to solder ONCE and then never again 🙄😉.
I don't really know how much current runs through these resistors during startup and why 1W is not enough - I already halved the value. Without much experimenting - bear in mind frequent soldering/desoldering is not the best thing to do to these PCBs
- what should I use? 1/2W Carbon 2R? Generg mentioned MOX?Regards
Sven
OK. Should I change R23(a)/R24(a), too? Today it's the same 2R 1W and they did not blow, however I would like to find a setup that reliably survives at least 1000 On/Off cycles without me opening the case and exchanging resistors... 😉
I suppose that is a actually good thing... 
🙄.
Will change to 1R1W and report back. If it blows again I WILL shoot it! 😉
Thanks for support.
Sven
🙄.Will change to 1R1W and report back. If it blows again I WILL shoot it! 😉
Thanks for support.
Sven
Worst case, you could always go overkill.
Like : 1R8 Fukushima MPC, MP925 (non-radiated ones if you're fast ).
Or fat pocket Isabellenhüte PBH, Bourns PWR221, etc.
(still think pointing a Hammer 44 Magnum at it is quick and painless)
Like : 1R8 Fukushima MPC, MP925 (non-radiated ones if you're fast
).Or fat pocket Isabellenhüte PBH, Bourns PWR221, etc.
(still think pointing a Hammer 44 Magnum at it is quick and painless)
Last edited:
Hi there.
I have started to check and solder what i have in stock... 😎
On Pumpkin cook book, i read : R9, R10, R14, R15, R29 : 150E to 240E.
How can i define the good value ? Is 220R OK ?
How to define the correct value for caps ? 😱
Sorry for these noob questions... 😱 But i am sure i'll have more... 😛
I have started to check and solder what i have in stock... 😎
On Pumpkin cook book, i read : R9, R10, R14, R15, R29 : 150E to 240E.
How can i define the good value ? Is 220R OK ?
How to define the correct value for caps ? 😱
Sorry for these noob questions... 😱 But i am sure i'll have more... 😛