Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Construction Tips Construction techniques and tips

DIY FM Receiver Power
DIY FM Receiver Power
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
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,


Nathaniel
  Reply With Quote
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.
  Reply With Quote
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.
  Reply With Quote
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.
  Reply With Quote

Reply


DIY FM Receiver PowerHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
hk power amp board for 560 receiver gmne Solid State 0 28th July 2018 09:14 PM
Receiver Power Upgrade, itīs possible? Smarley Solid State 19 28th October 2016 11:20 AM
Converting a B&K Receiver to a Power Amp MTAtech Solid State 25 18th May 2015 04:23 PM
Power Amp vs. HT Receiver. Juggy Solid State 3 9th February 2009 06:51 PM
Control amp power on/off by receiver? bradonline Everything Else 2 11th January 2008 12:47 AM


New To Site? Need Help?

All times are GMT. The time now is 05:38 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki