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What do you mean by that?How are you monitoring and adjusting the transmitter's output level?
Maybe the level is way too low.
Look at the specs in their datasheets:I have replaced the lm833 in the reciever with a lm358.
Then the noise from the lousy old LM358 is almost doubled. If a low noise opamp is used then the range is almost doubled.I have replaced the 10k resistor on the inverting input on the amplifier with a 5.1K for more gain.
Good.I am operating the photodiode in the dark.
Between pin 1 of the lower LM358 and the 1k resistor that feeds the volume control.which capacitor do you refer to as i dont have a 4.7nf capacitor on my schematic?
Did you make the receiver circuit on a breadboard with many long wires that act like antennas? Use a compact pcb in a grounded metal box as a shield.I still cant get this to work
When i turn on my tv i get massive white noise on the headphones of my reciever where as when my tv is off i have none. This happens if my tv is within about 2 metres of the reciever. Its not being recieved by infra red either as the transmitter was off and the photodiode covered up.
Further than 2 metres and i still cant get any audio transmitted anyway
Also the led on the reciever is always on when turned on, even if i completly cover the photodiode. Surely it should only be on when the transmitter is recieving infra red signals?