request: power on delay na transformer less

[mighty122001]

hihingi po sana ako ng circuit ng power on delay na transformrless,,,, may nakita po kasi ako lm555 na circuit kaso gus2 ko gawing transormerless ang supply pra maka save nmn sa gastos....
salamat po..

[insomartin]

hanap ka nang 5 volts na powersupply. madami sa junkshop at malamang malaki yung chance na meron kang makukuhanan. computer power supply is pwede na for that application. ATX has a stand by 5 volts. (meaning di mo na kailangan i ON.) hanap ka lang nang transformer between 5 to 20 volts. then regulator lang.

kahit sirang cellphone charger pwedeng power supply. wag mo i compromise circuit mo. lalo nang PROTECTION CIRCUIT YAN!

[bravokilo]

Mayroon ako mga relays dito na may on delay na pero maiksi and delay like 3 seconds.  u cannot us ic with no transformer, prone to spike damage to begin with.  yung 3 secondss napansinko, may capacitor dun.  ang timer kasi lagi cap lang yan chinacharge muna. so, AC to DC, charge a cap na kakabit sa relay. mataas na resistor in series to charge the cap.  Pero kilangan mo rin ng drain circuit para ma reset. Ah, forget it.Find an old adaptor na may DC isolated na and use the Alexan POD circuit.  I made and sold many of these PODS. I still have some.


BK 0922 281 0680/8253867

[jfar223344]

Sir pwede ko bang mahingi ang schematic nyang 3 seconds power on delay. Post nyo naman d2 please! Thanks!

[j a y k e z]

parang ganito ba un sis 

pero kailangan pa rin ng traffo or psu jejeje.