cor wrote:This shows type C with also the usual intrinsic diode from Source to Drain (though that diode is not used in this application).
One more mistake that I made in my sketch is that ZD2 on base of Q5 does not go to the ground as drawn, but to the negative input supply - the nearest point is pin 5 of U1 that has this connection.
I see that you have used just a single symbol for ground,
cor wrote: while there are two different ground references and they are not connected:
cor wrote:. And you can add a third input contact next to the 110/240V AC input, for connection of Earth ground. This contact you can also tie to frame ground.
OK, we are on the home stretch here - these are the only cleanups that I could find. I will re-post my suggestions for current mods and the fan mod to get the 12V fan to run continuously, so we have all NES info concentrated in this thread.
The other half is actually connected from the bottom of the secondary winding to the same +48V output as D, having R101 and C101 as snubber.
simply because it is directly connected to the negative 48V output (via L100).
cor wrote:hi dnmun,
if you have a picture of the internals of the clone then it should not be too difficult to compare it to the NES.
On my NES-350-48 with it's trimmed shunt, when the current drops to 20ma it audibly clicks "off" and current ceases to flow. The led stays green though.
I generally charge with a turnigy watt meter inline so I know when it's "swicthed off".
NeilP wrote:With regard to R127 R128 I suppose they should really be shown connecting as close as possible to J100?
cor wrote:Since Q5 is fed from the transformer - if there is no current that can be drawn from the 48V output then the voltage feedback will regulate the PWM controller back until also the other power supply outputs (fan, PWM controller) receive so little power that the supply goes into shutdown mode. That is why you hear a click from the relay dropping out and the supply shutting down.
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