Recent content by Lokidtc99

Really glad you like them! A pleasure doing business with you. Best David

Ok. A huge thanks for all your help chaps. I’ll take the board out and replace transistors and associated components as suggested and see if that resurrects it. It’ll be a while before I can get the parts, but I’ll report back once I’ve swapped them out. Thanks again for all your input and...

That’s a handy suggestion - thanks!

Thanks Paul. Yes, the 0R22 resistors don't seem right. R27 (TR10 side) is showing as 0.4 ohms, and R26 (TR9 side) is showing a negative value that changes and contradicts itself as I change measurement range on the meter. I've never seen anything like that before - could it be an effect of being...

Evening all. I'm thinking about building another HackerNAP to bi-amp my speakers, and wondering what the point of diminishing returns is wrt separation of components into separate boxes. So, is it safe to assume that the following represents a series of options in ascending order of...

Oh, and I tried swapping the feedback cap (C2) for another to see if that made any difference, but it didn't...

Good suggestion - thanks:

R18 (68R) = 0.84V R19 (680R) = 0.36V Can you link to the schematic you've looked at please. I think I may have a different version (v1.6) as I can't see any 0R33 resistors on it. If you mean R26 and R27 then those are 0R22 on my schematic. But if it's those you mean, I measure 33.4V across R26...

a) Good channel = -0.029V, Bad channel = 0V b) With C2 shorted = 16.4V initially but dropping to 16.0V over about 10 seconds and then staying at 16.0V

And, as it happens, I started a thread about exactly this in 2016! https://pinkfishmedia.net/forum/threads/hackernap-feedback-caps.188933/

Yes, as you say, both interconnects connected to preamp (hope I haven’t damaged that) I have the feedback caps (I think they’re tants IIRC) on leads to facilitate cap rolling, but if the lead length is critical then I’ll just put the replacement caps straight on the board. I’ll need to go back...

Thank you. Results are: a) All connected b) Continuous tone when black probe on 0V and red probe on -V supply on both FE and OP PSU boards on both channels, but not when probes reversed. Continuous tone when black probe on +V and red probe on 0V supply on both FE and OP PSU boards on both...

Thanks for replying. This is the amp (click for large image): Soft start module operating normally: Lt channel Velleman speaker protection circuit operating normally: Rt channel Velleman speaker protection circuit 'tripped': Note, the amp is powered on, but there are no other cables...

Hi all, I wonder if someone might be able to point me in the right direction with steps to troubleshoot a HackerNAP please? I built it some 10 years ago, and it was in daily use for probably the first 7 of those. Never had any problems with it. Then I moved, and took it out of my system. It...

Thanks. That AI looks like an interesting option...