PNP 0 - 13.6v 500mA PSU

154

02:29:54

Fairly good regulation, use a heatsink for the output transistor. 

published 5 years ago

PrathikP

5 years ago

http://everycircuit.com/circuit/5517339871936512 are you sure this is 500mA capable

PrathikP

5 years ago

So there are a few problems, the major one being the output (load) is referenced to the power rail and not ground. That's a big no-no. Very big, actually. Your series pass transistor must be on the high side. Second is the line and load regulation. Clearly, it cannot supply 500mA. And finally, the line and load regulation: such two transistor regulators have no line and load regulation capabilities whatsoever. And I'm sure you know what this circuit's temp co is!

BillyT

5 years ago

Yes, PrathikP, I see the performance in your circuit, I am amiss in not fully checking out the circuit. It is one I have built for low current experimentation, I got the circuit originally from a educational book I am trying to get the reference for this circuit. This is a tried and tested circuit, used for education. Ground regulated circuits are not uncommon, think about + & - power supplies, and yes it is rated for 500 mA.

PrathikP

5 years ago

Don't you do tests when you make a circuit? Like overcurrent/short circuit test etc before uploading? And whenever you make a PSU, ALWAYS fix a load before uploading.

BillyT

5 years ago

I have been using this device for years & it works fine, it might be something in EC's transistor parameters.

PrathikP

5 years ago

That isn't a reason to not test your circuit. Besides, you can easily change the parameters.

PrathikP

5 years ago

And these 2 transistor regulators never work. you can take my word for it

joesoap

5 years ago

@PrathikP you’d get a better reception from people if you tone down the destructive criticism. You can take my word for it.

martydog

5 years ago

Agreed, we're all on same side

PrathikP

5 years ago

@joe now I can use flowery language and make you miss the point and avoid the elephant in the room which, let's face it, you will, or I can state facts plainly and be concise. Now whether you take my feedback as distructive criticism or as truthful and accurate feedback is completely upto you, as is whether you would like to succeed by letting people point out your mistakes and learning from it is. That's all I shall say.

BillyT

5 years ago

@PrathikP, I agree with your comments and am open to correction and suggestion, I also agree with your comments on two transistor PSUs, I do Not know why the circuit disagrees so much from the one that I used for experimentation. The only difference being the amount of overhead voltage. I offer a 3 transistor psu, it is a standard circuit, because of the lack of space, I have had to leave the switches out. http://everycircuit.com/circuit/5811170261598208

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