Varistor join in parallel.

It normally use as protect the circuit or certain component. If you see some varistor in power board, you know it is good design.

You can read some detail in Google search. I not good in electronic. 

I’ve been designing PCB for some time and they pass common tests. It’s not required for all design to have a surge protection on design. But if the nature of the device is placed in a an environment where prone to lighting the the designer has to consider to include surge protector on the design

The cal lab nasty explode during watching TV. No lightning or raining that time. Probably some surge elsewhere.

No replace back. Just use the Belkin surge.

Still have 1 cal lab for the network system.

As you said it is cheap little small component. It is better than nothing.

Why the design save on it if it have to deal with the grid power ?

Here I install varistor on a 3phase 200V electrical power.

Here my cal-lab surge protector using varistor component with a nasty explosion. I use this to protect AV. This is not my 1st time protector varistor explode.

Hi Guys,

Early this week, I had installed the long awaited smart lock for my house front door.
This is a good stuff... so it's worth sharing to you.

The model is U-tec Ultraloq UL1.
I got it from Indiegogo by backing the project.
https://www.indiegogo.com/projects/ultraloq...th-smart-lock#/

From my long research, it's the only digital lock in the market that fulfills my criteria below:
1. Door access with fingerprint, card and remote app access.
2. Compatible with IFTTT and Alexa (optional).
3. Compatible with most Malaysia door lock hole (important).
4. Competitive price.

Item #3 is very important for me.
I had installed the lock within an hour without the help from locksmith.. no modification on the wooden needed == no additional cost.

Of course, I also did some research on other digital locks from Gateman/Yale, Samsung, Xiaomi, Schlage, August and etc but none of them can fulfill my criteria.
The only downside for this Ultraloq is the company, U-tec is relatively new startup.
Good thing is... the lock works nicely on my door now. 

Nice! Any photos of your installed lock?
How to know what’s compatible with our existing doors?

how does it integrated with ur smarthome? ifttt?

not really. mine is a mortise lock
i took a look at the ultralok, it seems to be a dead bolt.
totally different from mine which wont fit as i already have a bigger hole to begin with 

What is the manual unlock for emergency ?

Thanks. Yes all info shown at the digital TNB meter. My house constantly 250V+ using 3 phase. Should I call TNB ?

Digital TNB - 250.3V+

Install AVR

After install AVR

Input 170V-260V
Output 230V
[attachmentid=9850648]

My input voltage at the TNB digital meter constantly above 250V. AVR only working at 1 plug only. The rest still high voltage 250V+. Just call TNB and make a report  ast them to check input voltage.

[attachmentid=9850723]

TNB meter above Voltage should not exceed 240V right ? Voltage 3 x 240/414V

I refer to your link https://forum.lowyat.net/topic/691458/+640#
Post #: 640

Can someone explain this. I'm not understand about this statement

Voltan Nominal
PEMBERITAHUAN
Adalah dimaklumkan bahawa Suruhanjaya Tenaga (ST) telah bersetuju untuk menetapkan pemakaian standard MS IEC 60038:2006 – IEC standard voltages sebagai voltan nominal bagi sistem bekalan voltan rendah yang baru di Malaysia iaitu 230/400V dengan julat +10% dan -6% pada frekuensi 50 Hz dengan julat ± 1%, menggantikan voltan bekalan sediada iaitu 240/415V dengan julat +5% dan -10% pada frekuensi yang sama.
Pemakaian standard MS IEC 60038:2006 – IEC standard voltages ini berkuatkuasa mulai 01 Januari 2008.

http://www.st.gov.my/ms/web/general/details/144

Hi Sifu,

I got Broadlink TC2 3 Gang switch and i link button 1 into 3 light, after i installed the first week suddenly 1 of the light bulb burned out so after i replace a new light bulb an hours later it burned out again on the same location as i set timer to turn off at 11PM automatic daily but i was doing something so i turn on manually

PS: i'm using Yeelight color bulb

total of the switch button got 7 yeelight which is 3x2x2 and the rest was fine only 1 always burned my bulb

I am wondering the nominal voltage published by ST of 230V, is this peak voltage?
http://www.st.gov.my/ms/web/general/details/144

The voltage measured by Sonoff or other energy meter also measure the peak voltage?

no i do not have but inside the broadlink box got 3 LED connector and i asked the vendor what is that use for and he say it is for if the LED light flickering then install at the light, do you think this can solve it? and how do i install is another problem 

[attachmentid=9854532]

This ?

i bought these but still havent install yet - https://www.aliexpress.com/wholesale?catId=...+smoke+detector
you need the gateway if you want the "smart" features but it can work on its own too. I guess the Heiman probably works the same way

hmmm....

so you have many of these touch switches correct? are they hook up to a hub? using RF?

Touch switch smoke detector ?

Never heard before.

Cannot be that sensitive....
Maybe somebody else turn it on. Sometimes we forget

You mean normal smoke detector ? Not the smart 1?

I have 2set normal smoke detector.