Velleman MK111 Interval Timer (mini kit): Assembly and Function

[@EdwardGutierrez90]

Thanks for the upload, im 2 weeks new working with electronics, fascinating stuff, thanks again

[@201081hero]

I put one of these together the other day, instructions were clear enough to follow but watching your video probably would've speeded up the process a bit. The only thing was I very nearly soldered the two trimpotentiometers the wrong way round as there wasn't a way to tell the difference between the two but everything works as it should and fits the purpose I bought it for originally.

[@t44florida]

Yes...it can be tricky soldering these tiny parts. Have to be careful not to accidentally solder two legs together.

[@workingTchr]

Thanks! You probably saved me from ruining my attempt at building my new kit. (I would have soldered the IC directly onto the board, I think!). And now I know how to solder.

[@t44florida]

Thanks... Great thing about the kit is good instructions...and by following them I'm assured you would have inserted IC.

[@utkf16]

Thank you for replying.

[@utkf16]

Why are you using the 3v Button battery? Im new to electronics and cant work out from the instructions why one is needed thank you

[@t44florida]

Sorry for the late reply. I only check this channel at random. The 3v battery button is used in the video for demonstration purposes only. The current to the timer is completely separate from the current for the LED. The devices are completed isolated from each other. However, in reality, I have only one power source feeding both devices... the timer requires a certain voltage and amperage and the LED requires a different voltage and amperage. My single power source feeds two wires (a positive and a negative) to each device. Because both devices require different voltages/amps you must place resistors in each line to regulate how much power or current each device requires. You determine the resistor by calculating how much voltage and amps your power source outputs vs how much voltage and amps your devices require. The button battery was just a simple low voltage source I used to simplify the wiring for demonstration.