Gun Safe light revisited

[Chris W]

After some more research, I think I will try the CAT32 chip

http://www.catalyst-semiconductor.com/documents/32.pdf

However I have a few problems. I don't want to have a special PCB made
for this project. So I was going to use an SOT-23-6 to .100" pin
adapter board from digikey, and then the rest of the components on a
generic prototype board.. After looking closer, I found that the only
recommended inductor I could find has to be purchased in quantities of
2000. From reading the data sheet it sounds like having a very low DCR
is one of the more important properties of the inductor. I found a high
current inductor of the correct value that has an even lower DCR than
the recommended ones, will that work fine? Specifically I am talking
about digikey PN |M5804-ND data sheet,
http://www.jwmiller.com/pdf2/5800.pdf

I can find capacitors with the recommended specs and the diode but both
are surface mount, can someone recommend a non surface mount capacitor
and diode that will be compatible?

BTW, for the dimming I was going to experiment with a 555 timer and a
photo resistor to create the PWM input to the dimmer control pin of the
CAT32.

|

--
Chris W

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[Frithiof Andreas Jensen]

"Chris W" <1qazse4@cox.net> wrote in message
news:UBm8e.548$yO2.419@lakeread07...

recommended inductor I could find has to be purchased in quantities of
2000.

That's the problem with SMD in general; with many items, the only way to get
a-few-bits is to know a friendly distributor, who will send samples on
request. Usually, one's business has to buy something in return.

I still do not understand why it is necessary to be so clever; A linear
transistor circuit made with good-olde discretes could do the same job
perfectly well.

 

[Michael]

Frithiof Andreas Jensen wrote:

"Chris W" <1qazse4@cox.net> wrote in message
news:UBm8e.548$yO2.419@lakeread07...

recommended inductor I could find has to be purchased in quantities of
2000.

That's the problem with SMD in general; with many items, the only way to get
a-few-bits is to know a friendly distributor, who will send samples on
request. Usually, one's business has to buy something in return.

I still do not understand why it is necessary to be so clever; A linear
transistor circuit made with good-olde discretes could do the same job
perfectly well.

To the OP: Did you check at DigiKey for Qty 1? They'll sell tape and reel or
one-sies, your choise.

 

[Jim Yanik]

Michael <NoSpam@att.net> wrote in news:4265346F.BA59531B@att.net:

Frithiof Andreas Jensen wrote:

"Chris W" <1qazse4@cox.net> wrote in message
news:UBm8e.548$yO2.419@lakeread07...

recommended inductor I could find has to be purchased in
quantities of 2000.

That's the problem with SMD in general; with many items, the only way
to get a-few-bits is to know a friendly distributor, who will send
samples on request. Usually, one's business has to buy something in
return.

I still do not understand why it is necessary to be so clever; A
linear transistor circuit made with good-olde discretes could do the
same job perfectly well.


To the OP: Did you check at DigiKey for Qty 1? They'll sell tape and
reel or one-sies, your choise.

I bought 3 of the LT1932 IC for my LED flashlight circuit from Digi-Key.
(Along with the other 5 components needed;rectifier,resistor,caps,inductor
for each IC circuit)
I had to buy the caps and resistor in quantities of 10 though.Not much of a
price increase.
--
Jim Yanik
jyanik
at
kua.net