Electronics Lab Philippines

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1
Introduce Yourself / Re: Introduce Yourself
« Last post by hcj on Yesterday at 11:20:46 AM »
..di pa yata bumalik sa normal biyahe doon pahirapan parin, baka magprusisyon pa ako.
2
Electrical Appliances / Re: Refrigerator Power-ON Delay; PIC timer
« Last post by danny on Yesterday at 12:04:29 AM »
scary hehehe  ;D
3
Biotech/Biomedical Engineering / Re: working on PICKER CTTWIN C.T.SCAN
« Last post by danny on Yesterday at 12:02:04 AM »
musta  :)
4
Introduce Yourself / Re: Introduce Yourself
« Last post by danny on Yesterday at 12:01:35 AM »
daming taga cebu dito
nakalimutan ko na mga username nila hahaha
5
Chit Chat / Re: balik elab
« Last post by danny on October 19, 2020, 11:39:58 PM »
great to see you here again  :)
6
Electrical Appliances / Re: Refrigerator Power-ON Delay; PIC timer
« Last post by Super zHero on October 19, 2020, 10:24:29 PM »
This is the PS schematics:


Note that the 5V return is directly connected to the 220V mains source.  I don't want to risk hooking up my O'scope GND to this! :o
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Electrical Appliances / Re: Refrigerator Power-ON Delay; PIC timer
« Last post by Super zHero on October 19, 2020, 10:06:47 PM »
Getting back to the circuit, the PS is a very common "Capacitor Dropper" which uses a capacitor instead of, say, a transformer or resistor to drop the mains voltage to a useful level.  This type PS you can find in low wattage 220Vac LED bulbs, LED night lights, LED flashlight chargers, etc.

In an old topic that I posted, it is even used in my IR remote controlled electric fan.  These circuits are non-isolated from the mains and are dangerous to work on, to say the least.  Since they can only give a few milliamps out, I made back-to-back, identical type isolation transformers so I can safely mess around with PS and not worry about blowing up my scope or electrocuting myself:



The primaries go to the mains 220/230Vac and outputs 220/230Vac on the 2nd transformer's secondaries.
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Professional People / Re: Off-Grid Setup(Solar panel)
« Last post by cliffromz23 on October 19, 2020, 01:59:29 PM »
DI makita picture link sir..
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Chit Chat / Re: fb account hacked
« Last post by cliffromz23 on October 19, 2020, 01:55:58 PM »
mag panggap ka rin.. tapos gamit ka new account.. kunwari may i e offer ka or favor or barter etc....
tapos e meet mo..  boom panis yan..

report mo muna sa pnp e blotter mo
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Introduce Yourself / Re: Introduce Yourself
« Last post by hcj on October 18, 2020, 08:01:45 PM »
Hi!

Sino taga Cebu? Nakalimutan ko pangalan ng napakalawak na shrine doon. Balak ko sana puntahan uli kung open
ba ito.
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