I would like to ad an over load short circuit protection to the apexaudio Regulated PSU for my Bench power supply.
I started and asked apex for advises in this thread but I thought that it will be better to start an new thread in the power supply forum.
Thanks steveu who help all ready.
I was also thinking that may be better to have a circuit base of the new transistor biased by a voltage divider network.
Do you thing that is correct like that. Please advise !!!
I started and asked apex for advises in this thread but I thought that it will be better to start an new thread in the power supply forum.
Thanks steveu who help all ready.
I was also thinking that may be better to have a circuit base of the new transistor biased by a voltage divider network.
Do you thing that is correct like that. Please advise !!!
Question:
Why would you use such crap as a bench power supply?
There are lots and lots a bench supply schematics, why use this nonsense?
Why would you use such crap as a bench power supply?
There are lots and lots a bench supply schematics, why use this nonsense?
I did not expect this kind of question, but that still an advice somehow.
i am very happy with this design and I hope for something more appropriate regarding the add-on (Overload and Short-Circuit Protection) to the existing design
i am very happy with this design and I hope for something more appropriate regarding the add-on (Overload and Short-Circuit Protection) to the existing design
I have become addicted to my lab bench power supply's adjustable current limit feature, couldn't imagine living without it. Same for having four digital panel meters: Vout+, Iout+, Vout-, Iout- . The circuit in post #1 lacks these features and so it's not for me; but, to each his own.
I'm concerned that the "error amplifier" part of the regulator has relatively little gain (compared to other voltage regulator designs), so its "load regulation" (dVout / dIout) will be relatively poor. It appears possible to drastically increase gain by cascoding the NPN, and replacing its 220R collector load resistor with a current regulator diode (examples) .
Finally the red MPSA42 might want to be a different part number, the 'A42 suffers from relatively severe quasi saturation. Measured IV data attached.
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I'm concerned that the "error amplifier" part of the regulator has relatively little gain (compared to other voltage regulator designs), so its "load regulation" (dVout / dIout) will be relatively poor. It appears possible to drastically increase gain by cascoding the NPN, and replacing its 220R collector load resistor with a current regulator diode (examples) .
Finally the red MPSA42 might want to be a different part number, the 'A42 suffers from relatively severe quasi saturation. Measured IV data attached.
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Attachments
I'm sure you didn't but sometimes one has to say what people need to hear, not what they want.
And that presumptuously called "regulated supply" is just a grose improvisation, is has way to many issues to be worth discussing it.
Even a jellybean opamp like LM358 with some voltage reference and one darlington power transistor would do a much, much better job as a bench power supply.
this will likely work OK for a supply for testing different kinds of amplifiers, but is not a Bench power supply.
You need to add a couple diodes over the pass transistors to protect them against reverse polarity. Also add a diode over the output so that the supply can be put in series.
I would caution against using 10mF on the output as it negates most of the benefits of the current limit,
You need to add a couple diodes over the pass transistors to protect them against reverse polarity. Also add a diode over the output so that the supply can be put in series.
I would caution against using 10mF on the output as it negates most of the benefits of the current limit,
