KapaNoDrawBack circuit from a German friend

[NickZ]

  I asked Igor what diodes he uses on his home made full wave bridge rectifier. He mentioned any higher voltage ones, but was not specific about it. He uses the diodes that look just like mosfets. When drawing 2kw loads his diodes get hot, also.
  My Mazilli/yoke circuit is not really dealing with HV, I try to keep the volts around 120 to 160v, or so. Higher amps, yes, but it's non shocking current as well, and not the regular hot electricity or normal household wattage. 
  I probably have all the components to make a heftier bridge rectifier set up, and will do so, sometime soon.

[Hoppy]

  I asked Igor what diodes he uses on his home made full wave bridge rectifier. He mentioned any higher voltage ones, but was not specific about it. He uses the diodes that look just like mosfets. When drawing 2kw loads his diodes get hot, also.
  My Mazilli/yoke circuit is not really dealing with HV, I try to keep the volts around 120 to 160v, or so. Higher amps, yes, but it's non shocking current as well, and not the regular hot electricity or normal household wattage. 
  I probably have all the components to make a heftier bridge rectifier set up, and will do so, sometime soon.

The suggestion to use fast diodes for your FWBR is good advice. The ones that look like mosfets are in a TO220 package. A rating around 20A rating should be fine. Make sure you put then on a heat-sink and insulate if necessary.

[NickZ]

  Hoppy:
  I made this today, but I'm not sure what they are, if diodes or not. As I couldn't find any info on them.  Trying to make a bridge rectifier bank with them.
  Can you help...  The value written on them is:
   f   DH47AD
   FDP
   8896

[Hoppy]

  Hoppy:
  I made this today, but I'm not sure what they are, if diodes or not. As I couldn't find any info on them.  Trying to make a bridge rectifier bank with them.
  Can you help...  The value written on them is:
   f   DH47AD
   FDP
   8896

Nick.

Those are N channel mosfets.

https://www.fairchildsemi.com/ds/FD/FDP8896.pdf

[gyulasun]

Hi NickZ,

I collected some ultra fast diode types at Digikey so that you could see the part numbers for them from 600V to 1200V breakdown voltages and from 8A to 15A forward current ratings.  (I do not mean to buy from Digikey of course.)  Here is the link:

http://tinyurl.com/fastdiodes

Perhaps you have a chance to find any of those types (or similar) near to your location.  MUR860G or MUR880EG are mainly used in switchmode power supplies and should be available at several places.  (There is the MURF860G type too which has a full plastic case insulation on its back and the through-hole, so no need for additional insulation when mounting on a heat sink.)

Gyula