Electricman2K5
New Member
I need to create a "through the air" optical
communications system to transmit speech. Like an optical walkie talkie for 10m range.
1) I want to simply do this without a microcontroller. Using a microphone a Analogue To digital converter and then a transmitter IR LED section. To decode at the other end I will use a Phototransistor to a DAC then a speaker.
I need a serial ADC/DAC device can anyone think of one which will be suitable also what other stuff will I need.
2) Also I was thinking of using a LM565 PLL chip and an FM system instead of the ADC/DAC method but it isnt sold anymore is the LM567 the same/equivalent???
Does anyone know which system is the best to choose 1 or 2?????
Any help would be appreciated!!!
communications system to transmit speech. Like an optical walkie talkie for 10m range.
1) I want to simply do this without a microcontroller. Using a microphone a Analogue To digital converter and then a transmitter IR LED section. To decode at the other end I will use a Phototransistor to a DAC then a speaker.
I need a serial ADC/DAC device can anyone think of one which will be suitable also what other stuff will I need.
2) Also I was thinking of using a LM565 PLL chip and an FM system instead of the ADC/DAC method but it isnt sold anymore is the LM567 the same/equivalent???
Does anyone know which system is the best to choose 1 or 2?????
Any help would be appreciated!!!