cde 334 Posted August 13, 2011 Share Posted August 13, 2011 I need to replace a transistor on the remote control for an old radio boombox. Took it apart because the batteries in it rusted out, and had to clean the contacts. Saw that the center leg for the transistor was also rusted through. It was a kec c3203 npn transistor. http://oldwww.kec.co.kr/data/databook/p ... TC3203.pdf I have a bunch of smd mmbt3904 npn transistors (smd versions of 2n3904). http://www.fairchildsemi.com/ds/MM/MMBT3904.pdf Would I be able to replace the c3203 with the 2n3904? From the circuit I am repairing, the important part is a simple transistor as a switch circuit. Vcc -> IR led -> SMD 1R5 (1.5ohm) resistor -> Collector of C3203 transistor -> Emitter of Transistor -> Gnd And the switch is (assumed) Vcc -> Remote IC -> SMD 121 (120ohm) resistor -> Base of Transistor -> Emitter -> Gnd. Assuming a 3v VCC due to using 2 AA, the ic to transistor is 25ma. Not knowing the IR led drop voltage, I can't tell what the current should be (Side note, found http://www.qsl.net/wd9eyb/klunky/framed.html which let me build a simple schematic online. w00t) Quote Link to post Share on other sites
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