And you need a connection from R1/VR1 junction to D1/C4 junction.
Basically, D1 is across R1 and C4 is across VR1.

 

do you mean like this?

 

And you need a connection from R1/VR1 junction to D1/C4 junction.
Basically, D1 is across R1 and C4 is across VR1.

 

It should be C3 is across VR1.

 

It should be C3 is across VR1.

Sketch?

 

do you mean like this?
View attachment 136308

It should be C3 is across VR1.

Oops, sorry. Yes. C3.
Another night editing while being tired.

 

Thanks

 

So i got around to building this and surprise surprise it doesn't work......

When i turn it on it briefly flashes with life until the internal protection in the HP power supply trips out.

I have triple checked for a short with none found which leads me to believe its a fault in the circuit design.

This is the circuit iv used that PCB wizard created from the circuit drawing.

Anyone see any errors?

Thanks

 

hi K,
Following the Green 0V track back to C1., There maybe more I will check further.
This image may make it easier for you to check.
E

 

thanks, what should it be?

 

Check C1 polarity

 

Are you using an LM317 or LM7805?
They have different pinouts.

 

LM 317

 

Check C1 polarity

So i switched C1 round and it stays on.

But im not getting in output....

 

It looks like you have the pinout of an LM7805, not LM317.


Try swapping the pins around and see if that fixes it, assuming the reg is still ok.

 

so i swapped them over and.... still no voltage output... but im now getting 1.59 A on the ammeter and its getting hot quickly...

 

I would say you have popped the reg. Take it out of the board and see if there is still current flowing. If so, look closely at your board layout.
Also, as your capacitor was in reversed, it may be damaged too although if it was swapped quick enough they often do survive.

When you say you fixed the reg, did you just turn it around or cross over a couple of pins to get it correctly wired?
An easy way is to bend the input pin up, then solder the remaining 2 pins into the board but one hole to the right, and than run a wire from the pcb input pad to the bent up pin.
When I do a pcb design for a reg, it has 4 pads, not 3. Then as it is In, Adj, Out, In, either pinout can be used. A handy trick to remember.

 

Hi, no I scratched away the tracks and soldered jumper wires. I will check the reg and see what’s going on....

 

So i swapped the reg and also the cap and still it outputs 0v and 1.8A.

So must be a fault in the circuit design...????

 

Hello,

Perhaps this project might give you some ideas:
https://xtronic.org/circuit/regulated-power-supply-lm317/

Bertus