Second Stage Joule Thief Circuits

[Groundloop]

Albert,

It is also nice that we now have +5 volt converted from the AA battery.

Later on we can add a PIC16F88 to the circuit (and a n-type mosfet) and
then we will also have the discharge switch. With a pic in there we can also
pulse modulate the charge (and discharge) so that the current is keep at
a level that the mosfets will tolerate. The f88 pic can run on a internal oscillator
and can be run slow so that the current usage will be minimum.

When you have tested the circuit then we can make a nice pcb for the project.

(I highly doubt one can get ICs from http://www.maxim.com/ ) :-)

I'm pretty sure you meant http://www.maxim-ic.com/ :-)

Alex.

[gadgetmall]

Albert,

It is also nice that we now have +5 volt converted from the AA battery.

Later on we can add a PIC16F88 to the circuit (and a n-type mosfet) and
then we will also have the discharge switch. With a pic in there we can also
pulse modulate the charge (and discharge) so that the current is keep at
a level that the mosfets will tolerate. The f88 pic can run on a internal oscillator
and can be run slow so that the current usage will be minimum.

When you have tested the circuit then we can make a nice pcb for the project.

(I highly doubt one can get ICs from http://www.maxim.com/ ) :-)

I'm pretty sure you meant http://www.maxim-ic.com/ :-)

Alex.

Oops.. I see what you mean . Fellas and gals I meant www.maxim-ic.com  not the girls site .  .

Alex the two i have are not dip and are as small as ants . I have reordered the csa version . and hope package SO is DIP with 8 legs . Look at this thing  . Its surface mount and there is no way i can use it ,it was a free sample and there are many styles . I didn't know the package code . I reordered 2 more samples of every max856 they offer . You can order Free samples of the max chip csa+ . Means no lead in that component . these are max856 so package . soic is what i have .I have to get an adapter to use these i have . they sell them here but i have no idea how to solder them without a hotair soldering station .but i might give it a try . here is the site to get smt and soic to dip adapters http://www.proto-advantage.com


Edit ok the SO is MINI DIP . what i got was MICRO ! I have soldered these minidip before ,at least they have legs BUT you need a board to solder to so i will not be able to test this . You need a variable temp soldering station and a magnifying loupe which i have  . Its not that hard if you have a circuit board with the solder points ,i don't . So max856csa is mini dip and will need an expensive adapter  . The boards will have  that type of surface ? or do we need to buy adapters to regular dip ?   never mind we need MAX856CPA . It is the only one that is dip . and its not free . I cannot find them anywhere online without buying 1000'dollars worth : ) So i will stick with csa versions mini so with tiny legs
Picture is beside a quarter and a small transistor . these are usless and are umax surface mount .

gadget

[Groundloop]

Albert,

Don't worry. I will include the PIC16F88 and a discharge circuit into the design
and get a pro. pcb. The pcb has solder mask so soldering surface mount components
is not a problem. I have hand soldered mini sops ICs, but it is difficult and you need
a head wear magnifying glass. I will also make the feed back voltage threshold
a variable setting so that you can adjust the voltage threshold point.

Working on the circuit right now..........

Alex. 

[gadgetmall]

Albert,

Don't worry. I will include the PIC16F88 and a discharge circuit into the design
and get a pro. pcb. The pcb has solder mask so soldering surface mount components
is not a problem. I have hand soldered mini sops ICs, but it is difficult and you need
a head wear magnifying glass. I will also make the feed back voltage threshold
a variable setting so that you can adjust the voltage threshold point.

Working on the circuit right now..........

Alex.

Alex , The CSA version of the chip is free sample and its Mini  dip  package type so so it does have legs and i used to work for Uscellular on their cell phones so i can solder these . the adapter is not that expensive i found one here http://www.proto-advantage.com/store/product_info.php?products_id=2200216

there 4.99 plus shipping 3.00 for one adapter from soic to dip . I think i would rather solder the mini so csa chip and NOT buy an adapter but for testing i bought two adapters so i can run it on a proto board. I have two chips  coming from maxim for samples  . The Chip above in the picture is out of the question and will be scrapped its umax and useless for our project here . No problem though , i'll wait and get the csa versions next week . I MIGHT be able to solder them on a solder proto board on the backside where the copper points are . So please wait before you spend money on pro boards .
Albert

I got a few more toy Ic's from Maxim and One is real interesting . It is an 8 pin DIP  max1771epa+ /  its a 2 volt to 12 upconverter . I can't wait to test this on the cap output for another purpose !


PS... i just ordered 2 soic to dip adapters for 12.98 Us .so not too bad . This will convert the free chips to 8pin dip which i have sockets for . Also you can order weekly free samples from maxim  2 each up to 7 items for free !! . Already order three times and requested quotes on less quanity than 1000 . We will see .

Guyss this is going to be Great ! . I know this will self run manually so this circuit is going to work i do believe, for the worlds first public self runner anyone can make and own ! well almost anyone .

[Groundloop]

Albert,

Here is the circuit with a discharge to load added.

I'm going to order pcbs for this circuit and will have
the circuit ready for testing in 2 - 3 weeks time.
(Sorry, that is the fastest production time I can afford right now.)

Alex.