Radio which work only on one station

[robo12]

Hi I want to make a radio which work only on one station. (ex. 89.9) and nothing other. Is there a schematic? I want to work on 5v or 12v.
Thanks!

 

[barry]

There are plenty, I mean PLENTY of schematics for radios. Pick one. Then instead of using a variable capacitor for tuning, use a fixed one.

 

[robo12]

Thanks,
it's logical but I'm beginner.

 

[Audioguru]

Many cheap radio circuits drift their tuning. Then you must re-tune it frequently. Usually a temperature change drifts the tuning.

 

[barry]

Many cheap radio circuits drift their tuning. Then you must re-tune it frequently. Usually a temperature change drifts the tuning.

He wasn't asking for a GOOD radio

 

[robo12]

I want sth good with two speakers and amplifier.

 

[Borber]

As a beginner you can try to assemble some simple FM PLL radio. It would not drift of your station.
Such radios has one chip for stereo receiver, microcontroller to control PLL and PLL chip.

Radio modules with TEA5767 chip are available on ebay.
One of such projects just to look at it is here: https://320volt.com/en/tea5767-pic16f628-dijital-pll-kontrollu-fm-radyo-alici-sistemi/

 

[Audioguru]

The Philips TEA5767 FM stereo tuner IC is modern.
I have some very cheap FM radios that use a Chinese copy of Philips older TDA7088 FM tuner IC. The radio costs only $1.00 and comes with earphones and battery cells that cost much more so the radio is free.
Its sound is very distorted and it is overloaded by all the strong FM radio stations in my city. It scans for stations and misses some of them. It is mono, not stereo.
Like most cheap FM radios it has Automatic Frequency Control (AFC) that covers up its frequency drifting.