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Didn't you know that the NPN transistor inverts the logic? Without the transistor, the LEDs light dimly when the output of the microcontroller goes low. With the transistor, the LEDs light brightly when the output of the microcontroller goes high.
To have the same logic as before, you could drive the anodes of the LEDs from a PNP transistor then the cathodes of the LEDs are connected to ground. Then the LEDs will light brightly when the output of the micro controller goes low.
@p.gholap93
But according to the data sheet, we have to select 330 ohm resistor. if you check the datasheet of transistor. But ithink you are also right that small base current can also take the transistor into saturation.
You can fiddle around with the frequency adjustment of the RX-2B decoder IC that was designed to be used in a children's toy.Hey! Audioguru
i have completed this one. what to do with this one now?