Vondior Battery Backup modification (Radio Mod)

[@jeffking291]

Cool. 📻🙂

[@45AMT]

Nice Mod! Makes you wonder why the manufacturer couldn't spring for a cheap capacitor. But they pinch pinnies when it come to cheap radios.

[@TheRadiogeek]

Yeah I know right? It such a easy thing to do but I guess it just wasn’t in the budget. 😜

[@todderbert]

Cool! Fun to Tinker :)

[@skycarl]

Neat little trick to save time and frustration. Good one RG.

[@TheRadiogeek]

Thanks Carl. Did you get your roof fixed? I hope you are doing well.

[@skycarl]

@@TheRadiogeek Hey RG,,, looks like I have it secured to get thru winter,,,, thanks pal.

[@TheRadiogeek]

@@skycarl glad you got it worked out. Take care👍

[@VintageElectronicsGeek]

Your such a geek. and I wouldn't expect anything less! :) Awesome mode! ~Jack, VEG

[@TheRadiogeek]

Well you know, if you have geek in your name then it must be true. 👍

[@DriveInFreak]

I see that the AM coil wires are right over the metal speaker frame and magnet. That can't be a good idea.

[@TheRadiogeek]

Yes it not a good idea. I guess they ran out of room and or just didn’t care. Slap it together and get it out the door. 😜

[@DriveInFreak]

@@TheRadiogeek LMAO I'm guessing that a fairly easy mod would improve things a bit. I had the Horologe (sp?) version of that and the AM wasn't all that bad. The AGC circuit wasn't the best, though.

[@ebrahimkunnath8408]

Gosh, brilliant idea!!

[@TheRadiogeek]

Thanks! 👍❤️📻

[@rohtashjatav9974]

Kaha se milega

[@Radiowild]

Neat mod!

[@TheRadiogeek]

Thanks!

[@IAdryan]

Great idea ! However, something is not right. The time [t] it takes to a capacitor [C] to discharge [DU] at some current [I] is t = DU*C/I. If we consider the clock stop at 2V we have DU = 1V => t = 1*10E-6/(100E-6) = 0.1 sec. (the current is 95uA from the teardown measurement; aproximated to 100uA here) So, for we to have 10 sec discharge time we need to have a capacitor 100 times larger than 10uF => we have at least 1000uF there. Can you verify what is the situation ? Either the capacitor added is 1000uF or something was going wrong when you first changed the batteries (like for instance pressing a button by mistake ?) ps - i'm kind of a geek myself with radios :)

[@TheRadiogeek]

I just checked and it is a 10uf cap. I powered the radio with a power supply and lowed the voltage until the display went out. The voltage at that point was 1.64 volts

[@IAdryan]

@@TheRadiogeek 🙂Yeah, those ceramic capacitors are usually small. I was looking at those electrolytic capacitors (one on the left and one on the right) and they seem to be 2 x 470uF. It is possible that they are holding most of the backup energy and that little one added helped them doing it.

[@TheRadiogeek]

@@IAdryan I don’t think so because without the 10uf cap installed the display go out almost instantly. The radio loses it time before you can get new batteries installed.