hello,
i have prepared IR CORDLESS HEADPHONE as a project in my college.my circuit is devided in two parts 1)transmitter 2)receiver.transmitter is connected to audio device through audiotransformer.and on receiver side i have used "ir photo transistor"as receiving device.a transistor(BEL187)is used to drive the audio output i.e.head phone.now the problem is that when i turn ON the circuit it doesnt work.means i dnt here any sound on my RECEIVER.but when i touch one RESISTOR the sound starts coming.in the following link my circuit is there.and the resistor R7(470kΩ)in the receiver circuit is the resistor by touching which the sound starts coming.please help me.i dont know why it is not working but i think it is not a systamatic fault.do u think it is fault in desiging the circuit?pl.tell me franqly. thank u very much**broken link removed**
i have prepared IR CORDLESS HEADPHONE as a project in my college.my circuit is devided in two parts 1)transmitter 2)receiver.transmitter is connected to audio device through audiotransformer.and on receiver side i have used "ir photo transistor"as receiving device.a transistor(BEL187)is used to drive the audio output i.e.head phone.now the problem is that when i turn ON the circuit it doesnt work.means i dnt here any sound on my RECEIVER.but when i touch one RESISTOR the sound starts coming.in the following link my circuit is there.and the resistor R7(470kΩ)in the receiver circuit is the resistor by touching which the sound starts coming.please help me.i dont know why it is not working but i think it is not a systamatic fault.do u think it is fault in desiging the circuit?pl.tell me franqly. thank u very much**broken link removed**