Small Wart 200 and ISD1020AP

[smallbearelec]

I have just posted (finally!) the high-current version of my power supply series.

http://www.smallbearelec.com/Projects/SmWart2/SmallWart2.htm

I hope you find the design useful. I did succeed in getting an early prototype into a 125-B box, but the board was very cramped and I wasn't happy with the smaller heat sink and limited room for air circulation. By spreading it out, I have made it way easier to build and more likely to last for many years. The drawings have been vetted by a few people who have built it, so I am confident that they are good.

Re the requests for the looper chip: I have received 100 pieces, and I sent one on Saturday to Dean H for testing before I go to market. I'm just exercising reasonable care, as I have no experience with this supplier. I expect to hear back this week, and I will post ASAP.

Regards
SD

[ryanscissorhands]

SO good to hear, man. I'll wait to hear the ststus of the ISD1020's before I place my big order. I'm excited.

Three cheers for smallbear!

[H.Manback]

Nice stuff, you gotta love the way you can stuff that much in a 1590BB :wink: (I know, you can get more in to that :lol:).

Just one question, although there is not much heat to be dissipated (I calculated about 1.6 W at 9V), doesn't it need some kind of ventilation?

And now I think of it, why does the back of the LM317 have to be at Vout voltage? Isn't that awkward when making a heatsink stick out of the box? (I know, that's not the case here)

[smallbearelec]

I have tested the thing extensively, and I'm confident that there's enough air circulation within the case to keep the thing from blowing up. The resettable fuse also limits potential damage.

[H.Manback]

That's great, that resettable fuse should come in handy as well, fuses always have a habit of blowing up when you don't have a spare