Finally i got replacement backup capacitor.
After soldering new cap and testing problem was solved, clock can be unplugged and after powering back time is still counting.
ElectronicNoobBlog
My "fight" with electronics devices :-)
Author Archives: ENB
Fixing PHILIPS HF3451 Wake-up Light clock backup battery (capacitor)
From some time, my great Philips Wake-up Light start suffering from resetting clock time after short power loss. I remember that some time ago, when unplugged in power loss occurred after power back clock time was continued. It clear indicate problem with backup battery. I decide to open and investigate.
Inside i found not a single use backup battery but capacitor. Over time it’s lost capacity.
I do not have spare so decided to order new one from bay.
Continuation
re-celling Clansman 24V (PRC 320 and similar) battery and installing new eneloop cells
Video of re-celling process
Pictures.
This is newer plastic one (i do not recommend for re-celling)
HYT BL1719 (HYT TC 446S tear down battery to see inside
I tear down HYT BL1719 to check if possible re-cell.
Diference between REAL and REPLICA U-229 connector on TRI PRC 152 radio
Here You can see deference between REAL and REPLICA connector U-229 (it’s not exactly U-229, because U-229 is female) on TRI PRC 152 radio.
Adding screw M10 terminals to 2000W 12V power inverter cabling 35mm2
This soldering is not a proper way – terminal should be crimped, but i don’t have crimping tool for that size so i use this solder pot as work around!.
2000W inverter in ideal condition at 12V should take about 2000W/12V = 166A but to be safe, have low voltage drop and make sure it will work at 10V (2000W/10V = 200A) + efficiency i decide to use 35mm2 copper cable.
The cheapest cable I found was a “welding negative ground cable” it was much more cheaper than cable dedicated to car audio amplifiers 🙂
Just make sure to mark red “positive end” 🙂
PT 936 clone soldering station – repair by replacement PCB
Here’s simple repair of soldering station 939 i’v got not working for couple years. I got myself from aliexpress for 2USD! whole pcb 🙂
Just need to solder, connector in place, and calibrate:)
Working perfect:)
How solder EC5 battery connector terminal using hotair ?
In my opinion it’s better to use hotair because You won’t touch ec5 body so You won’t left any solder left on sides – if You left then You will have trouble fitting conductor element into plastic case and need to use lot of force!!
- Strip wire
- Apply little bit of flux then add solder onto wire
- using hotair heat ec5 pin and fill solder into hole (about half of hole)
- fit wire while heating, wait couple of seconds then remove heat source
- cold down and apply heat shrink tube
- fit pin into plastic case using flat screwdriver
- BEFORE STRIPPING ANOTHER WIRE MAKE SURE FIRST ONE IS FITTED INSIDE PLASTIC (or insulated) TO PREVENT ACCIDENTAL SHORT!!
Here pictures of that operation:
TRI PRC 152 Replica u-283/u connector crimp terminal to pcb name
I’v got myself a TRI PRC 152 replica and i’m trying to put real military issued u-283/u connector, but i have to figure out what kind od PCB connector is used between TRI board and that connector.
The answer is: PicoBlade Molex Mini Micro JST 5pin 1.25mm
and could be bought without any problems on RC stores.
Here are some pictures.
