Zener fails in transformerless power supply

Replies

• 

  balaseven

  Hi kuku,
  
  Make sure that u have reverse biased the ZENER diode.Moreover,your expected regulated output should be same as zener diodes reverse breakdown voltage or zener voltage.For example, If your expected regulated output is 10V,you should select diode which has zener voltage as 10.
  Hope this helps u.
• 

  kuku

  Hi BibB,
  Thank for that.
  But everything is ok.Then also it fails.
• 

  sauravgoswami

  why dont ya use high-ampere diode say HV135 or simply increse the capacitor load
• 

  balaseven

  Kuku,
  
  whats your input voltage,is it 230V AC?
  i think,you r trying to get the step down transformers's funtion without using transformer,isn't it?if you dont mind,post your circuit,i will analyze and try to tel the reason.
• 

  kuku

  hi Sourav,
  Thanks for reply. Actually i think its not taking so much power with calculation its hardly reaching 1W.
• 

  sauravgoswami

  hey if u need DC supply then use a bridge rectifier as it devides the load between the diode,if u wanna regulate the AC voltage then diode is not suggested but why u aint using a transformer???...its the best way to regulate AC...