Re: Modification of the Radioditty charger with "TP5100" card at $ 2.
Posted: Mon Apr 27, 2020 11:48 am
"Harcourt Studio" look
Amateur radio firmware for the GD-77, GD-77S, DM-1801, DM-1801A, RD-5R, MD-9600/RT-90, MD-UV380/RT-3S, DM-1701/RT-84 and MD2017/RT-82 radios
https://www.opengd77.com/
The modification that's on http://members.optuszoo.com.au/jason.re ... 77mods.htm and in this thread in a few variations replaces the entire charger circuit with a TP5100 module, leaving the charger base and battery contacts but everything else is replaced.Juan Francisco wrote: ↑Thu May 21, 2020 11:51 pmyou can take advantage of the components of the old board ??? the TP5100 only without filters etc emits noise in the radio if it is connected while charging? Thank you
No, you need to feed it with a proper power supply. You don't have a 12V desk PSU there for other radios etc? And no, leave the voltage alone, the TP5100 is pretty well designed, and much better than the stock charger circuit that overcharges.Juan Francisco wrote: ↑Mon May 25, 2020 10:32 pmI have just installed the tp5100 but in output it gives me 8.3 volt Is it normal? Or should I give 8.4?
If I use the original charger of only 500ma, will the battery charge well? Obviously it will slow it down. My intention is to have an original 500ma charger for the night and 12v 2a for the day and thus have 1 amp of charge.
** The main reason for switching to tp5100 has been not only the possibility of charging in half the time, I am also looking for stability in the load with the taste value and the taste cut in voltage , I also understand that after cutting if the voltage drops to 8.2 it returns to load to leave at 8.4 (8.3 in my case)
Sounds like you have this issue, which some do. Mine doesn't, not sure if it's because it's newer, or older, or luck. Look for "Soft audio squeal at low volume" on this page: http://members.optuszoo.com.au/jason.re ... 77mods.htmJuan Francisco wrote: ↑Tue May 26, 2020 10:54 amI have a source from a charger liitokala 500 that gives 12.5volt and 2amper. Something that if I have won is to avoid the annoying noise that is generated when the battery 100% is above 8.3 + -volt (it generated a small hum the amplifier) . Thank you
Exactly I think why it is of the first models since it is from 2017 if I remember correctly but it is as if it was new since I stopped using it because I did not like its firmware until I discovered the wonderful openDG77;) .. has a solution with a resistance but I think it is something risky and delicate. With the 8.3 load there is no problem. Thank youkt4lh wrote: ↑Tue May 26, 2020 12:21 pmSounds like you have this issue, which some do. Mine doesn't, not sure if it's because it's newer, or older, or luck. Look for "Soft audio squeal at low volume" on this page: http://members.optuszoo.com.au/jason.re ... 77mods.htmJuan Francisco wrote: ↑Tue May 26, 2020 10:54 amI have a source from a charger liitokala 500 that gives 12.5volt and 2amper. Something that if I have won is to avoid the annoying noise that is generated when the battery 100% is above 8.3 + -volt (it generated a small hum the amplifier) . Thank you
You don't want to use the original charger, it can not supply enough power for the load that the TP5100 will provide.Juan Francisco wrote: ↑Sun May 31, 2020 10:04 pmI put the new tp15100 module with the original 500mAh charger of the radioddity DG-77 and my surprise charges in only 3 hours, before with the original cpb it took 6 hours + - . From which I deduce that that original PCB or board absorbed part of the energy or limited it.