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I don't know where in the world you are, but here in Canada I can buy a cheap Chinese FM radio at The Dollar Store for $1.00. It comes with earphones, a battery and has a light that is a flashlight.
It uses a Chinese copy of a Philips radio IC.
You don't tune it, it scans the dial and you can stop the scan at a station.
Its reception is for strong local stations only, it picks up a lot of interference and its sound is very distorted.
You might be able to make one for $25.00 in parts if you can buy all the parts somewhere.
My Sony Walkman FM radio cost $19.95. It is stereo, sounds very good and picks up strong and medium local stations. It gets overloaded by strong local stations so it has an attenuator on its antenna input.
- is this 1 US dollar, or dollar from another country?
- you mentioned that it must be a circuit. So I assume then that we must include a speaker for the sound to come out, but is this correct? Or is it ok to simply offer a connection for IPOD headphones or similar?
- must we include the pcb in this budget?
- must we include the connectors in this budget?
- must we include the power supply in this budget?
My starting assumption is that we will not find a complete FM receiver IC to fit into our budget, so the design may have to be a simple discrete design using low cost transistors like 2N2222 or the like. This is why it is best to find the simplest designs.
If there is a chance of finding an FM receiver IC for less than $.75, it might be one of the NXP/Philips line, for example the TEA5767. Even in low quantity from a North American distributor, this IC is less than $2 so it might be available from an Asian supplier for less than $1 in medium volumes. When I do a search for this part, I see there are many Asian manufacturers with overstock or old stock of this part, so there are many brokers with quantities for sale.
Can we have a circuit for the Scan and Reset function as it is available with those cheap FM radio ? If you have any such circuit please help. I shall try to source the components from Asia which shall be cheaper....