Help wanted for repairing a battery heating system

[Renaud Métrich]

Hello,

I have a battery pack of a skiboot heating system broken (from Therm'ic
vendor).
The battery pack consists in a 5.3V battery and a 3 positions switch
enabling graduous heat in the feet. This is done thru an oscillator
outputing to a component (looking like a transistor) serving like a
power switch for the second circuit consisting in the 5.3V battery and
some heating wire of 10 ohms. Everything is CMS.
The burned component has "1AKM" written on top, but I can't find this
reference while google'ing.

Maybe some of you could help me find the exact reference or some
equivalent. I can send a schema of the circuitry if required.

Thanks in advance for your help,

Renaud.

 

[[email protected]]

Hello,

I have a battery pack of a skiboot heating system broken (from Therm'ic
vendor).
The battery pack consists in a 5.3V battery and a 3 positions switch
enabling graduous heat in the feet. This is done thru an oscillator
outputing to a component (looking like a transistor) serving like a
power switch for the second circuit consisting in the 5.3V battery and
some heating wire of 10 ohms. Everything is CMS.
The burned component has "1AKM" written on top, but I can't find this
reference while google'ing.

Maybe some of you could help me find the exact reference or some
equivalent. I can send a schema of the circuitry if required.

Thanks in advance for your help,

Renaud.

Youre not giving us any of the info needed to identify it.

NT

 

[Renaud]

[email protected] a écrit :

Youre not giving us any of the info needed to identify it.

NT

Hello, circuitry is available here:
http://millet.corp.free.fr/Circuit Thermic.pdf

The component represented as a transistor (but again maybe it is not a
transistor) is in the bottom right), connected to the 5.6K resistive
capacity.

Renaud.

 

[JW]

[email protected] a écrit :

Hello, circuitry is available here:
http://millet.corp.free.fr/Circuit Thermic.pdf

The component represented as a transistor (but again maybe it is not a
transistor) is in the bottom right), connected to the 5.6K resistive
capacity.

Renaud.

http://www.ortodoxism.ro/datasheets/philips/BC859_860_4.pdf

 

[Franc Zabkar]

[email protected] a écrit :

Hello, circuitry is available here:
http://millet.corp.free.fr/Circuit Thermic.pdf

The component represented as a transistor (but again maybe it is not a
transistor) is in the bottom right), connected to the 5.6K resistive
capacity.

Renaud.

Since your load does not exceed 0.5A, you could use any NPN transistor
with a low VCEsat, high hfe, and a 2A rating or better. You will find
these kinds of transistors in remote controlled cars, for example.
Some leaded types that come to mind are 2SC3420, 2SD1685, 2SC2270, and
2SD826.

- Franc Zabkar