Electronics > Projects, Designs, and Technical Stuff
723 psu issue
xavier60:
I must mention also that it will not be capable of safely supplying 20 amps without pre-regulation.
And I don't think that MOSFETs are suitable for paralleling. I haven't really looked into it.
xavier60:
--- Quote from: xavier60 on November 15, 2018, 12:29:29 am ---This should be able to made to work with some experimenting.
Q2 and associated circuitry is an adjustable current source which sets a voltage drop across R5 which determines the current limit threshold.
One unknown is how much Base current that the 723's current limiter transistor needs.
--- End quote ---
This idea had already been thought of in post #27, https://www.eevblog.com/forum/projects/linear-lab-power-supply/25/
m3vuv:
hi xaviar60 any idea what sort ov size pot v3 should be in the schematic you sent?,cheers Paul m3vuv.
m3vuv:
i have some of these(op05cp intrument amprifier ic's),could i use one somehow to amplify the voltage generated across the sense resistor to feed the cl/cs pins on the 723 somehow?.
xavier60:
--- Quote from: m3vuv on November 19, 2018, 12:02:18 am ---hi xaviar60 any idea what sort ov size pot v3 should be in the schematic you sent?,cheers Paul m3vuv.
--- End quote ---
The usual 10k linear pot. It will be ok with a lower value so long as R1 is of a value that will pass enough current to keep D2 forward biased at times when the unregulated rail drops in voltage.
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