- #1
ramonegumpert
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Dear Experts,
I am using a NPN transistor part number C33840 (i think aka BC338-40).
The collector is tied to Vcc @ 12V.
The emitter connects directly to the capacitor of 1000uF.
The base is supplied with a small current of about 0.9mA (1 LED) from a 1k resistor (in series with the LED) before it.
There is switching going on with the transistor. Prolly 10 hertz.
May i know how to prevent the transistor from overheating or the possible causes? I have 1 such transistor fried after running the circuit for a very short while.
sincerely
Ramone
I am using a NPN transistor part number C33840 (i think aka BC338-40).
The collector is tied to Vcc @ 12V.
The emitter connects directly to the capacitor of 1000uF.
The base is supplied with a small current of about 0.9mA (1 LED) from a 1k resistor (in series with the LED) before it.
There is switching going on with the transistor. Prolly 10 hertz.
May i know how to prevent the transistor from overheating or the possible causes? I have 1 such transistor fried after running the circuit for a very short while.
sincerely
Ramone
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