I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.

Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.

I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?

?Soft start to prolong torch bulb life??

TIA

Jim K

On 13/08/2014 14:09, JimK wrote:
I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.

Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.

I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?

?Soft start to prolong torch bulb life??

TIA

Jim K

Probably an inductor, and being used as part of oscillation cct

Would need picture to confirm

--
UK SelfBuild: http://uk.groups.yahoo.com/group/UK_Selfbuild/

/Probably an inductor, and being used as part of oscillation cct /q

Excuse my ignorance, but why would you put one of those in an 18v non-led battery powered torch?

Thanks

Jim K

On Wednesday, August 13, 2014 2:09:37 PM UTC+1, JimK wrote:

I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.
Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.
I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?
?Soft start to prolong torch bulb life??
TIA
Jim K

Probably bulb different voltage to batteries.


NT

On Wed, 13 Aug 2014 06:09:37 -0700 (PDT), JimK
wrote:

I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.

Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.

I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?

Torches often have DC-DC converters to adjust voltage, but it needs a
few more bits than that AIUI. No transistors?

On 13/08/2014 14:09, JimK wrote:
I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.

Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.

I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?

?Soft start to prolong torch bulb life??


Is there an unexplained black blob of plastic on the PCB? About 6 - 10mm
square or circular. If so, that's hiding the active bit of a SMPS. The
coil and the capacitor are the only bits that are too big to mount on
the chip.

--
Tciao for Now!

John.

On Wed, 13 Aug 2014 20:37:22 +0100, Simon Cee wrote:

On Wed, 13 Aug 2014 06:09:37 -0700 (PDT), JimK
wrote:

I'm mucking about making an adaptor to allow older Makita 18v kit to run on newer Makita lithium batts.

Bought an LXT torch and set about it.
Inside I was a bit surprised to find a small pcb. About 8 resistors, a capacitor and another component with a hole thru middle.

I'll try to get a pic up but in meantime anyone care to speculate on it's purpose?

Torches often have DC-DC converters to adjust voltage, but it needs a
few more bits than that AIUI. No transistors?

There'll be a tiny surface mounted IC, or maybe one under a black
blob.
--
Dave W