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DIY FM Receiver Power
DIY FM Receiver Power
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Old 18th October 2019, 08:14 PM   #1
nemmertkeaton is offline nemmertkeaton
diyAudio Member
Join Date: Oct 2019
Default DIY FM Receiver Power

I got a DIY bug and bought a small FM receiver off of Amazon.

Amazon.com: Icstation Digital FM Radio Wireless Receiver Module LCD Display DSP PLL 76.0MHz-108.0MHz: Home Audio & Theater

It's not much of a DIY project because really all it needs is an antenna soldered on and mounted in a case. It has a headphone jack and a USB jack. I thought it would be fun to mount it in an Altoid tin.

I have a question about it, though. I see that there is a place to solder DC power onto the board. If I plug USB power into the unit and measure the voltage on the DC IN terminals, it shows 4.5v DC. It made me think two things. First, if I solder a battery onto the board, what will happen to the battery if I plug the unit in to USB power? An alkaline battery might not like receiving 4.5v from the board. And second, if instead I soldered a rechargeable battery to the board, would it recharge when the board was plugged in? Would that be safe? Would the battery overcharge? Would there be some other circuit that I could add in to manage charging?

There is no 'off' button on the radio, so if it's going to run on battery power, I'll have to add a micro switch to turn the battery power off when not in use. I could turn the switch off and isolate the battery when using USB power, but it would be really slick to be able to charge the radio's battery like a cell phone.

I'm really a novice at this sort of thing, but I'm enjoying the learning coming along with it. If you have any thoughts, I'd certainly appreciate them.

Thanks so much,

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Old 21st October 2019, 03:42 PM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Modern rechargeable batteries are more fussy about charging arrangements than older technologies such as NiCd. You cannot simply connect a battery across a power supply. I suggest that for now you either use USB power, or a rechargeable battery which you remove for charging in a dedicated charger designed for that type of battery. You can add a switch to choose between these two power sources.

USB will normally supply +5V, so I don't know where you get 4.5V from.
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Old 21st October 2019, 05:56 PM   #3
nemmertkeaton is offline nemmertkeaton
diyAudio Member
Join Date: Oct 2019
Thank you, DF96. I appreciate the response. I'll choose one or the other.
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Old 21st October 2019, 06:00 PM   #4
russc is offline russc  England
diyAudio Member
Join Date: Mar 2011
Location: W Yorkshire
A diode after the battery will stop current flow from the USB power into the battery.
If 5V USB power & 4.5V battery, the 5V USB power will automatically stop the battery being used (due to being 0.5V higher) without switching between power sources.
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