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I couldn't wait. Found a nice heatsink I didn't use and inside it went. Mounted the TO220 lm317 isolated on the heatsink and it mates with the PCB using a small cable and pcbmount connector. Now at power on for about an hour the heatsink does barely even feel warm.
That heatsink is so large it looks like it blocks airflow...It looks like there may be issues with the weight coupled with vibrations and shocks making solder joints weak...Seems like there's enough room so they could have put there a regulator to get the voltage down to 6-7v, then use second regulator to get 5c and spread the heat on two heatsinks.
I wonder if they have switched to a different regulator as well? Even if it is still an LM317 the one they used seemed a bit odd, like the tab was unusually thin.
Outputs 2 and 3 share a common negative terminal, so setting output 1 to 12 V, output 2 to 12 V and output 3 to 5V and connecting the positive output of output 1 to the negative output of outputs 2 and 3 should give you -12 V from the negative output 1 terminal, +12 V from the positive output 2 terminal and +5 V from the positive output 3 terminal, referenced to the output 2/3 negative terminal.
Looks like the sense wiring in the unit isn't designed that thoughtful
Looks like the sense wiring in the unit isn't designed that thoughtful...
Quote from: nack on October 04, 2013, 09:23:41 amLooks like the sense wiring in the unit isn't designed that thoughtful...I like his way of testing for >= 100C.
Rigol really are sullying this power supplies reputation....