Hey Al-
May I ask you(moderator) if you can move Wim's pic posts over to Mikes thread?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=53160
No offence Wim, but I "think" we decided to open a new thread for the pictures.
No biggie either way, but it would just be easier to see the pics there instead of looking through this huge thread.
May I ask you(moderator) if you can move Wim's pic posts over to Mikes thread?
http://www.diyaudio.com/forums/showthread.php?s=&threadid=53160
No offence Wim, but I "think" we decided to open a new thread for the pictures.
No biggie either way, but it would just be easier to see the pics there instead of looking through this huge thread.
Looking good Wim! That sink should be quite efficient. You may find that your drivers run a tad too hot though. I was uncomfortable with mine and moved them over to the main acerage(sink).
Have you had a listen yet? Its a fun amp to listen in Mono!!!!!!
Mark
Have you had a listen yet? Its a fun amp to listen in Mono!!!!!!
Mark
Its ready to fire up, but i did not yet. next week i think.
When the driver get too hot, i will expand the little alu heatsink on the mainboard. Its easy to make the surface a lot bigger.
The toothpaste???? Well jacco, if you realy do not know were toothpaste is for, please don't open your mouth in front of this forum 😉
When the driver get too hot, i will expand the little alu heatsink on the mainboard. Its easy to make the surface a lot bigger.
The toothpaste???? Well jacco, if you realy do not know were toothpaste is for, please don't open your mouth in front of this forum 😉
PCB ADVANCE FRUSTRATION
Ok, I'm a little frustrated, what the *** is going on?
I've been following this from the start, got a pair of PCB's and read about the parts needed, now posted here. (In PDF).
So I ordered most parts, and my problem lies with the resistors, the parts list specifies 1% .5 Watt resistors, which are much, MUCH too big (I think, quickly looking at the board) to fit on the tiny footprint laid out on the board. I mean, I bought Dale 1% .5 watt resistors stupidly thinking that they would fit, looks like they won't. Now I've got a nice PCB and have to kludge together a clunky bunch of EXPENSIVE parts to make it fit.
ARgggghhh!
Not only that, but this thread is so huge, it can no longer be followed for construction details or issues.
Ok, I'm a little frustrated, what the *** is going on?
I've been following this from the start, got a pair of PCB's and read about the parts needed, now posted here. (In PDF).
So I ordered most parts, and my problem lies with the resistors, the parts list specifies 1% .5 Watt resistors, which are much, MUCH too big (I think, quickly looking at the board) to fit on the tiny footprint laid out on the board. I mean, I bought Dale 1% .5 watt resistors stupidly thinking that they would fit, looks like they won't. Now I've got a nice PCB and have to kludge together a clunky bunch of EXPENSIVE parts to make it fit.
ARgggghhh!
Not only that, but this thread is so huge, it can no longer be followed for construction details or issues.
Re: PCB ADVANCE FRUSTRATION
No need to worry....I used dale 1% 1/2w resistors, you just bend them "tight" and all mine fit in 100%...... So not sure where the problem is, mine look JUST like the original ones in the KSA-50...
The board was mostly designed with standard 1/2w metal film in mind... they will fit fine..... Halco's won't fit that i know of... Dale fits perfectly for me and it's been mentioned over and over again from the start... The Dale resistors i bought were reasonably cheap IMHO.... didn't cost much at all....
Aaron
lgreen said:
No need to worry....I used dale 1% 1/2w resistors, you just bend them "tight" and all mine fit in 100%...... So not sure where the problem is, mine look JUST like the original ones in the KSA-50...
The board was mostly designed with standard 1/2w metal film in mind... they will fit fine..... Halco's won't fit that i know of... Dale fits perfectly for me and it's been mentioned over and over again from the start... The Dale resistors i bought were reasonably cheap IMHO.... didn't cost much at all....
Aaron
I used all 1/4 watters on mine but my rails are also at +- 37 volts. For higher voltage rails as some are doing 1/2 watters are probably a good idea. I also measured all the temperatures of the resistors with a thermocouple and none are running at a high temp or near their dissipation rating anyway. On resistors that are spec'd in for larger wattage such as the driver emitter resistors I was able to get 2 watt current sense resistors that are small and they fit perfectly on the board. These resistors are also not dissipating anywhere near their rating. Krell was obviously VERY conservative with specing in 1/2 watt resistors. Stuart Easson has done some calculations and perhaps he can enlighten us as to how much some of them are actually dissipating on a 50 vs a 100 for instance.......
Mark
Mark
calcs...
Hi Guys,
Ordinarily I'd jump in a give what details I have in my notes... but I'm on the road and don't have my notes here. I don't remember any problems for 1/4w resistors in the majority of places. The emitter resistors for both the drivers and the outputs will dissipate some real power if very low impedance loads are driven, so don't go 'small' in these positions.
...it is a Krell Klone after all...
By the time the load impedance is diminished to the point where it is approaching the value of the emitter resistors the percentage of the total output power they are dissipating is getting pretty high...400w into 1ohm means a hundred or so in the emitter resistors, depending on exact values, count etc
It seems we, collectively, could probably benefit from a sort of 'sticky' front page(s) for projects of this sort. The overall synopsis, recommendations, sources etc could be collected onto it, along with issues, all the stuff that it is a pain to find in the thread once it gets too long...even specs, goals, etc
Stuart
Hi Guys,
Ordinarily I'd jump in a give what details I have in my notes... but I'm on the road and don't have my notes here. I don't remember any problems for 1/4w resistors in the majority of places. The emitter resistors for both the drivers and the outputs will dissipate some real power if very low impedance loads are driven, so don't go 'small' in these positions.
...it is a Krell Klone after all...
By the time the load impedance is diminished to the point where it is approaching the value of the emitter resistors the percentage of the total output power they are dissipating is getting pretty high...400w into 1ohm means a hundred or so in the emitter resistors, depending on exact values, count etc
It seems we, collectively, could probably benefit from a sort of 'sticky' front page(s) for projects of this sort. The overall synopsis, recommendations, sources etc could be collected onto it, along with issues, all the stuff that it is a pain to find in the thread once it gets too long...even specs, goals, etc
Stuart
What we really need is someone with time on their hands to compile all the build data into a Wiki, like the AlephX one. I don't unfortunately, but i will set up the page if someone else can do the collecting...
Hey Al-
If you create the Wiki I will start putting in the info.
Do you have the Aleph Wiki handy? I would like to read it and use it as an example.
If you create the Wiki I will start putting in the info.
Do you have the Aleph Wiki handy? I would like to read it and use it as an example.