very simple PS

[walid1]

Hi
please look at the figure below:
if as seen, the X1 secondary voltage is 6V AC, then the rectified DC voltage after the bridge and a cap (1000u/25V) filter is 6* sqrt 2 =8.49 VDC
is this true, please comment.
thanks

 

[audioguru2]

Hi Walid,
Nope. You forgot that the full-wave bridge has two 0.75V diodes in series for each polarity of the AC. So the DC output is 8,49V - 1,5V= 6.99VDC.

The current in the diodes is very high for short duration pulses, so the forward voltage of each diode is a little higher than 0.7V.

 

[walid1]

Thank you guru, u r  truly remarkable man

 

[ante1]

Hi Guys,

Perhaps it should be mentioned that the forward drop is actually 0.8V at 200mA (like in this app) and increasing to 1.1Volts at 1A.

AG; What happened to $crooge?

 

[walid1]

Hi

Perhaps it should be mentioned that the forward drop is actually 0.8V at 200mA (like in this app) and increasing to 1.1Volts at 1A.

how did u know it is 200mA, can u please explain it for me
thank you

 

[ante1]

Hi walid,

Of curse, the schematic you posted indicates a

 

[walid1]

thank you Ante

 

[audioguru2]

AG; What happened to $crooge?

Hi Ante,
Electronics-Lab "lost" my avatar so I changed its address to another electronics chat forum and now it works fine.

 

[ante1]

Ok AG, great I like to see who I'm talking to you know!  ;D