Looks good. Technically you dont need snubbers on fast diodes, because the mechanism that creates the noise doesnt actually exist inside fast diodes, only in standard slow rectified diodes.
It wont hurt, but yea, you dont need them.
It wont hurt, but yea, you dont need them.
That is the point. You didn't provide the space for it. You won't need a big one. A 3-5 mm thick aluminium sheet will probably do the job.BionicSniper said:
That means, one can get away without heatsink. I also wrote 'optional'. If you look into the datasheet, the MUR860 shoud be derated to 4 A at 25 °C and to 2 A at 100 °C case temperature without a heatsink. The load is shared among them, so you actually should have enough safety margin. Yet some people even put heatsinks on 30 A bridge rectifiers driving one LM3875 from a 2*18 V transformer. Eh, Rainwulf? 😉BionicSniper said:
You use four 35 A bridges for five channels. That is 28 A rating per channel. BionicSniper uses two 8 A bridges for two channels, hence 8 A rating per channel. Why heatsinks for you , but not for him?
I personally, would always heatsink if I exceeded 1/4 the rated power dissipation on average (occasional spikes are fine). I am way overdriving the diodes in my power supply when I push my amp (MUR860s, no heatsink, driving 2x 100W LML4780 channels). Unfortunately, the power supply board I purchased does not leave room for heatsinks. At some point I'll get around to designing my own power supply board with room for heatsinks.
Sometimes I will heatsink at even less than 1/4 rated power dissipation simply for longevity. In general, the cooler it runs, the longer it lasts.
Sometimes I will heatsink at even less than 1/4 rated power dissipation simply for longevity. In general, the cooler it runs, the longer it lasts.
I can put heat sinks on there. I would just have to separate the bulk caps from the diode set. Any recommendations for a heat sink? I'm going to use large copper cpu heat sinks for the lm3875's
There are quite a variety of small to medium sized TO-220 heatsinks available from Mouser. Something like 577102B00000G
Just remember the tab that the heatsink bolts to is live.
Just remember the tab that the heatsink bolts to is live.
pacificblue said:
Because it looks cool.. 🙂
I think its going to take up to much physical room, so i might just mount them on a lump of aluminium strip so its easier to mount.
well i redesigned it again. I have those heatsinks listed above (577102B00000G) on each chip and I've moved the cap bank to a separate board.
I also am getting two toroids so I am now going to build two separate psu's and go for mono blocks with the psu and amp in separate cases. I'm probably going to use powercon connectors to connect the amps to the psu.
I also am getting two toroids so I am now going to build two separate psu's and go for mono blocks with the psu and amp in separate cases. I'm probably going to use powercon connectors to connect the amps to the psu.
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