MAX712 help.....

*o* · Post by ***o*** » Sat Jul 02, 2005 6:18 am

i have the max 712....and in the typical operatin circuit (page one of the datasheet) there is no mention of what wattage resistor is required for any of them. also there is no mention of what voltage and type of capacitor

nos_slived · Post by **nos_slived** » Sat Jul 02, 2005 10:58 am

For the caps, the ones with 2 straight lines are ceramic, and the ones with a straight line over a curved line are electrolytic. C1, C2, and C4 are ceramic. C3 and the 10µF clean up cap are electrolytic.

If you're using a 12V PSU, all your caps should be rated at about 15V. If you use 1.5W or 2W resistors, you should be fine, because the highest draw I could see was 100mA(1.2W at 12V).

*o* · Post by ***o*** » Sat Jul 02, 2005 5:14 pm

ok thanks nos!!!

also it has a component labeled Q1 which is a 2N6109 where do i get this? are there any equivilants?

nos_slived · Post by **nos_slived** » Sun Jul 03, 2005 12:05 am

It's a transistor(properly labelled with "Q"). I will try to find an equivilent, but can't garantee anything. You might want to order everything from Digikey, because then you will get everything together.

*o* · Post by ***o*** » Sun Jul 03, 2005 12:55 am

oh.....

i will order it from maxim i guess......i wonder if i can get it as a sample....

nos_slived · Post by **nos_slived** » Sun Jul 03, 2005 1:10 am

Maxim doesn't have them on their site, or atleast I can't find them.

*o* · Post by ***o*** » Sun Jul 03, 2005 4:02 am

....do you know any other good suppliers...?

soundwave · Post by **soundwave** » Sun Jul 03, 2005 10:13 am

My samples (2packs of both 712 and 713s) should be coming sometime this week (I ordered them around 8-10 days ago), seeing as how i need a lot of other stuff from digi-key, I'll be ordering from them.

nos_slived · Post by **nos_slived** » Sun Jul 03, 2005 11:21 am

I Googled the part, and found one site selling them, but none of the big sites. I believe that the 2N6109 and 2N6107 are equivilent, but both are equally hard to find. I found a thread on another forum about the 712/713, and they were talking about the 2N6109 a bit. It was at the top of Google when I searched 2N6109. I will try to find it again.

EDIT: I found the thread.

I was doing some thinking, and I think the 2N6109 is just a general purpose PNP, so you may be able to use a 2N3906 transistor. I also found a site saying the SK100 transistor will work.

*o* · Post by ***o*** » Sun Jul 03, 2005 4:11 pm

Thanks nos!!

I will also go and look at an equivelant book at my good locacl electronic shop.......

....hey soundwave, i got my samples in 3 days

.......go figure

nos_slived · Post by **nos_slived** » Sun Jul 03, 2005 4:14 pm

Your samples probably went by air instead of land like ours. If you find some equivilent parts, don't forget to post them for us.

*o* · Post by ***o*** » Sun Jul 03, 2005 4:23 pm

Gonna call the store any minute......soon....yeah...they arent open for another 2 hours

*o* · Post by ***o*** » Sun Jul 03, 2005 5:07 pm

BD242C or 2N6109

this site:http://www.taotoon.com/max713-charger/

says that you can use either..

nos_slived · Post by **nos_slived** » Mon Jul 04, 2005 2:28 am

Like I said, I think you can use any general purpose PNP transistor. I am going to try with a 2N3906 when I get the rest of the stuff.

BTW, did you call the electronics shop?

*o* · Post by ***o*** » Mon Jul 04, 2005 2:34 am

no...i didnt have time