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actually i dont have the circuit just now, but i got that circuit from electronics for you site, n if it is not correct then pls do sent me the proper circuit????????
pls help me out, it is quite necessary.
That is the Indian circuit that does not work:
1) The transistor is not biased so it rectifies the signal producing severe distortion.
2) The red LED abruptly limits the current which causes even more severe distortion.
I think the design of the IR receiver is just as bad.
Why not use a modern little power amplifier IC like an LM386?
It has much less distortion and uses much less battery current than the horrible old circuit.
It has a push-pull output that is capacitor-coupled to the headphones so they don't have DC in them.
The LM386 can have a gain of 200 if a capacitor is added from pin 1 to pin 8.
It is easy to use the LM386 audio amplifier IC to drive a power transistor that drives two IR LEDs in series with amplitude modulation. A 9V alkaline battery will become weak in about 10 hours.
i have all the components with me, and i fabricated them on the bread board but i am not able to understand the connection of headphone on the breadboard.pls help me?????
n someone suggested me to use a mic as input, would it be correct to use a microphone????????