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| 723 psu issue |
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| 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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