Category Archives: Simple Repairs

Why it’s important to have oscilloscope and not always rely on multimeter measurement.

Here I post couple pictures of me, fixing LED WALL CLOCK.

There are spikes caused by (DC-DC converter) capacitor that failed (open, lost capacitance, high ESR) and they lead to RTC / MCU freeze and cause undesired operation.

On pictures there is waveform with failed capacitor (notice spikes) and after replacement.

Video:

Good looking capacitor turn’s BAD – why it’s good to have ESR meter

Here i’m working on Dymo PSU that failed, i most like expect leaked capacitor – but everything looks fine… for my eye… but not for ESR meter… we find a open (dead) cap that looks perfectly good and would never expect me to believe it was cause problem!

Also here is my video

How RIP VideoCD disc on linux and play it back on device without cdrom

I have lot of movies on VideoCD that i bought just to have in my collection and are still fun to watch, but DVD drive on my laptop computer many years ago was switched to second HDD caddy. Only way to play them is using external USB DVD drive with is problematic to carry around:) Is there option to easy “RIP” copy VideoCD disc into video file for easy playback?

Yes… on Ubuntu and many other distributions is easy as one command.

vcdxrip -C=/dev/sr0

where /dev/sr0 is our drive, in my case external USB drive
after running that command, we get extracted all .avi files that can be played from HDD using for example VLC player.

Zello sounding like DMR Motorola aka Talk Permit Tone

Here are two files that make Zello sound more like proper 2 way radio. ( Motorola Mototrbo )

One file is for beginning second for end transmission

Clansman PRC-350 (RT350) battery adapter mod for use rechargeable AA

Before and after applying mod

 

Leaked capacitor strike again! – devastation of power supply by electrolyte

Another failed power supply caused by leaked AC capacitor… this time PSU covered with electrolyte…

Fixing (blown) leaked AC filtration capacitor on AKSEL communication 13.8V 8A power supply

Fixing (blown) leaked AC filtration capacitor on AKSEL communication 13.8V 8A power supply.

After long fight i managed to get exactly same capacitor!

 

Anguis fragilis (Slow worm) – legless lizard