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group buy for DX Blame MKIII Hx PCBs

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#241
A friend from other forum told me these heatsinks

are presenting 52 degrées Celsius (Centigrades)... this is too much hot.... better if you can keep these ones at 45 to 47 degrées.

A taller, or bigger heatsink will be needed for him to cool down these two transistors mounted in separated heatsinks.... they are lovely but small, not that tall as i was dreaming for.

The guys is using 68 volts supplies...... and the higher the supply voltage the bigger will be the problem related these heatsinks.

In my construction, home prototypes using standard supply voltage, i have not noticed heat there because these transistors where mounted into the main heatsink...but seems you may face some trouble because heat there.

Be aware you may have to replace these heatsinks for larger ones.

regards,

Carlos
 

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#248
destroyer X said:
May give me one as a gift.

Ahahahahahaha.🙂

regards,

Carlos
Click to expand...

Boa noite Carlos.
Você tem os arquivos desse amplificador (esquema e layout)?
Se tiver e puder me enviar, fico agradecido.
Um abraço e obrigado.

translation by modeartion :cop:
and email removed, please use PM in public

Charles Goodnight.
Do you have files that amp (schematic and layout)?
And if you can send me, I'm grateful.
A hug and thanks.
 
#254
Dx

Hi .
I am building the dx blame, and i have a question regarding heatsink.
I'm on a budget so I'm using an old chassis, it's going to get a paint job, quite a yellow chassis, the heatsink are from an old pa amplifier and weigh around 5 kilos, my only problem is the fins, they are horizontal, convection must be degraded or am I wrong, adding some pics
 

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#256
Hi ,
I have a 55-0-55 VAC toroidal transformer after filtering total voltage is 68-0-68 VDC .
Total capacitance = 60,000 uf / 100 Volts.

Now let me know if this power supply can be used for making DX Blame MKIII HX modules.

Any way to get the PCBS?

Regards,
Samrat
 
#257
samratsarkar said:
Hi ,
I have a 55-0-55 VAC toroidal transformer after filtering total voltage is 68-0-68 VDC .
Total capacitance = 60,000 uf / 100 Volts.

Now let me know if this power supply can be used for making DX Blame MKIII HX modules.

Any way to get the PCBS?

Regards,
Samrat
Click to expand...
Hi..
The pcb says +/÷ 64 volt,, reckon that you can go a little bit higher without changing component values, but your 55 volt must give more than your stated 68 volt.. 55 times 1.4, gives around 77 volt.
Regarding pcb I bought mine on eBay of Jim's.. he claims he's an authorized dealer, but if you ask Carlos the designer it's a whole other story.. had I known the that I would have done things different.. maybe pm meanman here on diyaudio, I think he got original pcb made, maybe he has some in stock.. well happy New Year to all 😛
 
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