Neebee power supply build

[zippy500]

Hi everyone,

As  a start project I would like to build a 0-30v variable power supply.

I have come across this circuit;

http://www.electronics-lab.com/projects/power/001/

Is this a good starter project ? or can someone recommended a circuit to build ?

What I'd really like to incorporate is a Voltmeter and a Ampmeter, can anyone tell me which part of the circuit I need to incorporate  these

Thanks

[paul18fr]

follow this post  (same PSU)
https://www.eevblog.com/forum/beginners/power-supply-design-(2)/

[liquibyte]

The circuit works and I have built two of them but it suffers from a transient voltage issue on startup.  You need to read the threads about it over at their forums because the project you linked to suffers from underrated components and has been reported to fail.  See my posts about adding Q1 with its voltage divider back in too, it solves a shutdown transient.  You'd hook the voltmeter across the output and the ammeter across R7 if you want to measure the load current or from ground to pin 3 if you want to translate the 0-1.41V to 0-3A through a voltmeter circuit to show the current limit setting.  The latter is how I'm going to do it.  If you do build one, don't hook it up to anything sensitive before turning the power on.  At 30V you'll see around a 6V spike.

[David Hess]

We went through that design in the discussion paul18fr linked and came up with some improvements but did not solve the voltage surge on startup problem which I consider a serious issue.  I would look for a different design.

[zippy500]

can anyone suggest a different design- Im very new to this !

Thanks