1. Open
Ito ay koneksyon na putol, kapag ginamitan ang tester ay hindi gagalaw ang pointer, nasa infinity lang.
2. Shorted
Nagdikit na ang wiring, kapag ginamitan ng tester ay gagalaw ang pointer papunta sa zero, wala ka nang mababasang resistance kundi zero.
Sa resistor ay bihirang mangyari ito. Open at Leaky lang ang madalas.
3. Change Value (Leak)
Leak= tagas.
Leaky, nagbago ang kanyang resistance, bumaba or tumaas ang value nya.
Good Resistor= the exact resistance given by an ohmmeter is with in the maximum and minimum value of the resistor.
Bad Resistor= the exact resistance given by an ohmeter is not with in the maximun and minimum value of the resistor.
Good Capacitor= the meter pointer will slightly deflect to the right side and going back to left side, to the infinity side.
Ang pagtest ng capacitor ay kelangang magdeflect sya sa kanan at babalik pakaliwa sa infinity. Pagpalitpalitin ang test prob sa terminal kung uulitin ang pagtest.
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Power Supply Project
ang diode ay ganito, 1 ang direction.
Ganito ang power supply fro 220 vac to 12 vdc.
Half wave Rectifier
Full wave rectifier
Bridge Type Rectifier
Isang uri ng diode na 4 na diode na pinag isa, use para mag rectify
Step Down Power Supply
ito ay pwede kang magpalit palit ng voltage, from 3 v - 12 v.
Tandaan:
May capacitor ito at resistor para mapalinis nya ang pulsating DC.
Kapag Open na ang resistor ay 12 vdc pa din ang output voltage nya kahit inilipat sa 3 v.
Power Supply Spareparts
1 transformer 750ma
1 selector switch 5 position
4 diode IN4001 - 1 ampere
1 resistor 1k 1/4 watt
1 capacitor 1000 uf /16v
Credit:
http://www.play-hookey.com/ac_theory/ps_rectifiers.html
http://www.team-bhp.com/forum/modifications-accessories/50723-bennys-first-diy-leds-ikon-13.html http://www.tutorvista.com/topic/define-rectify
http://www.opamp-electronics.com/tutorials/rectifier_circuits_3_03_04.htm http://www.electro-tech-online.com/general-electronics-chat/110117-need-small-rectifier-design-12v-c-power-supply.html http://www.electro-tech-online.com/general-electronics-chat/110117-need-small-rectifier-design-12v-c-power-supply.html http://www.reuk.co.uk/Make-A-Bridge-Rectifier-From-Diodes.htm http://www.piclist.com/images/www/hobby_elec/e_diode.htm http://en.m.wikipedia.org/wiki/Diode_bridge?wasRedirected=true
http://www.industrial-electronics.com/Industrial_Power_Supplies_Inverters_and_Converter/5_Four-Diode_Full-Wave_Bridge_Rectifier.html
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