Help with board for SMPS

[george79]

Hello,
Can anyone help me please?
I need a board for this SMPS,but i cant use good eagle or other software for boards.I need the following SMPS.



Thanks
George

[george79]

anyone please???

[J0K3RX]

Single sided? Double sided?

[george79]

Thanks!!!!!!!!!!!!!!!!!!!!Save me!!!!!!!!!!!!!!!!!
I prefer single side for easy home made with ironing method!!!!!!!

Thanks again for the reply!!!

[Seljer]

I recently made a SMPS (buck boost to generate a negative voltage) without any PCB at all! Just some pliers to snip of bits of copper clad and superglue, making up the layout as I went along....And it worked the first time I turned it on (and in working, it fried my output cap because I didn't have any load connected so the voltage started rising).



But yeah, not sure if I'd want to do the same for higher voltages 

[thomasha]

Hi,

some layouts from this forum:





I made a layout on Eagle, but never tested it, and for SMPS for audio a good layout is very important because of the noises that this thing produces.

Made a max1771 smps instead and it works fine.

Cheers,
Thomas

[J0K3RX]

I made this real quick... Same as used in the GTFO.

Transfer pdf
https://dl.dropboxusercontent.com/u/11178619/Nixie/NIXIE.pdf

[jubal81]

Great layout. I see C11 is a small package. Do they make high enough voltage caps that size?

[J0K3RX]

Great layout. I see C11 is a small package. Do they make high enough voltage caps that size?

Yeah man... I built this a few years ago but if I do recall mine were 4.7uF 400V and 470uF 400V... average size I would say

[duck_arse]

if there is anybody interested in some custom wound toroids for this type power supplies, please let me know.

[Lurco]

Great layout. I see C11 is a small package. Do they make high enough voltage caps that size?

Yeah man... I built this a few years ago but if I do recall mine were 4.7uF 400V and 470uF 400V... average size I would say

Average size of a  470uF 400V usually used to be larger than a tube. Where did you get those tiny ones?

[george79]

WORKING LIKE A DREAM!!!!!!!!!!!!!!!!!!!!!!!!

Thanks a lot JOK3RX!!!!!!! 

[lietuvis]

here is another one compact layout

[J0K3RX]

WORKING LIKE A DREAM!!!!!!!!!!!!!!!!!!!!!!!!

Thanks a lot JOK3RX!!!!!!! 

george79 - That's good news!!

here is another one compact layout

That's a nice compact layout but keep in mind that the inductor coil and IRF740 can get smokin hot!

[J0K3RX]

if there is anybody interested in some custom wound toroids for this type power supplies, please let me know.

That sounds cool! What you got?  I would like some small, low profile transformers also, those that will produce HV for preamps..

[duck_arse]

at the moment I have 17mm o.d. cores which are a bit big. I'm looking for smaller at the moment. tell what inductance you want, which booster circuit you're using, and I'll wind.

[george79]

what is a suitable load for this SMPS output for testing purposes???i have tried a 230v neon indicator lamp.try a resistor or something else?

[duck_arse]

ohms law will tell you both the resistance and the power rating of a resistor you can hang on the output. how many volts do you expect, and what current do you want?

[Transmogrifox]

what is a suitable load for this SMPS output for testing purposes???

A resistor gives you control.  You can adjust it to the expected load, or try some min load, max load values.

R = V/I
where V is output voltage and I is intended output current.

Don't forget to make sure your resistor power rating is up to the job:
P = V^2/R = I^2R = V*I 
P is power and all 3 relationships are valid depending on what you want to used to calculate it.

You can make a load bank with resistors in parallel and/or series to get the power dissipation for each resistor within its rating.  A typical rule of thumb is to aim for less than 80% of their rating.

[PRR]

> neon indicator lamp

Neon bulb is a -negative- resistor. Once glow begins, higher current makes LESS voltage drop.

In all normal uses, a neon must have a series resistor to prevent current going to "infinity" and bursting the bulb.

For power supply testing, a neon load makes no sense. (A neon just for indication may make sense; but neons are going out of style, modern LEDs can make better indicators for >1mA supplies, and you still need a dumb resistor to be the load.)

Yeah, what others say. Friends:
V/I=R
V*I=P