Vero board with silver holes, haven't gotten into etching yet. Is it easy, is it expensive? Have seen that PCB CAD exist, but haven't played with them 'cause I haven't yet gotten into etching. Gonna Tiny CAD you're design quick (TinyCAD 'cause it plays well with VeeCAD), then use my vero board CAD (VeeCAD) to generate a vero board layout you can check...

 

Ok after you finish the design in the software ill check it out.

 

That heatsink looks about the right size, I wish they would give the thermal resistance. It will probably get too hot if you run at the full 1A continuous and the ambient is 30C but the 7805 has thermal shutdown and will not be destroyed.

By my calculations, you need a heatsink with 7C /W. Be sure to use thermal past between the heatsink and the 7805, and make sure there is plenty of air that can get around the heat sink, i.e. do not enclose it in a closed box.

Bob

 

That heatsink looks about the right size, I wish they would give the thermal resistance. It will probably get too hot if you run at the full 1A continuous and the ambient is 30C but the 7805 has thermal shutdown and will not be destroyed.

By my calculations, you need a heatsink with 7C /W. Be sure to use thermal past between the heatsink and the 7805, and make sure there is plenty of air that can get around the heat sink, i.e. do not enclose it in a closed box.

Bob

He gave up on 7805/LM350.
He is using LM2576 Sw. Regulator which at 5V2A has 31C°~.

 

my schematic, VeeCAD next

 

IMHO he was talked out of it for no good reason. Switching regulators are not for beginners.

Bob

 

Bob, Heat pushes up the price, even if there was a ready made heatsink that fits my parameters, it would be so expensive that I wouldn't have been able to afford one. I have no machining tools, so I can't drill a hole into anything. The 2 transistor method the same, same watt heat needs to be handled, the previous solutions were impossible due to their heat problems. Enter switching, it may be advanced technology, but it's piss easy to build.

 

IMHO he was talked out of it for no good reason. Switching regulators are not for beginners.

Bob

They ain't rocket science and he said he wants to learn.

my schematic, VeeCAD next

That looks right,good job!

 

Bob, I live in South Africa, where a 3K 1W resistor isn't standard, I have to use 3 * 2W Resistors to get the job done 'cause I can only get 0.5W and then 2W/3W/5W and only 3k3 value...

 

They ain't rocket science and he said he wants to learn.


That looks right,good job!

which components do you need close to which?

 

C1,C2 and diode need short ground path as close as possible to the ground pin of the regulator.

 

it's a mask, you can print it and it fits perfectly on your veroboard


I'm risking alot of ego here. [edit] NOTE see v1.5.4 [/edit]

 

obvious improvement

 

square is positive, circle negative, and radial is the most usefull layout for VeeCAD, which is lacking in the layout area

 

much better, the inductor have a leaded layout now that would have been a problem when using the mask!

 

I hate that kind of board they get solder bridges so damn easily and then you have to take a scalpel and run between the tracks to break any tiny bridges.
If you have inkjet printer you can make your own PCBs.

Can you mark where is the feedback connection going?

 

UPDATED layout: lost a jumper, added a break, fixed inductor (veroboard CAD can make you go insane, beware )

it's kinda upside down, negative R2 is inline with pin 4 (feedback)--track 5, then track 16 goes to high Vout(track 3); positive R1 connects with negative R2, on track 5, inline with pin 4, then the other end goes to negative on track 14 to track 5. I had the inductor wrong, that now fits between C2 and D1

 

here's your display of feedback line

 

A 7805, two capacitors and the heatsink you linked to would have given you a usable 5V 1A supply.

My prediction is you will come back to this when you cannot get the switcher working.

Bob

 

which heatsink?