diyAB Amp The "Honey Badger" build thread
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 4th November 2017, 10:01 AM #2911 Kay Pirinha   diyAudio Member     Join Date: Oct 2011 Location: Somewhere in Germany The higher the first filter capacitance, the smaller the diodes' conducting angle, the higher the peak current. Average current will stay the same at a given load, though, but we need to observe the diodes' peak current ratings and possibly the transformer's core saturation. Best regards! __________________ "Bless you, Sister. May all your sons be bishops." (Brendan Behan)
Ejje
diyAudio Member

Join Date: Nov 2016
Quote:
 Originally Posted by Kay Pirinha The higher the first filter capacitance, the smaller the diodes' conducting angle, the higher the peak current. Average current will stay the same at a given load, though, but we need to observe the diodes' peak current ratings and possibly the transformer's core saturation. Best regards!
Okey, thats beyond my knowledge of diods and transformers..

This is the bridge rectifiers I'll be using.
"Max Surge Current: 400 A"
"If - Forward Current: 35 A"
They should be able to handle some beating right?

I haven't seen any datasheets for my transformers. They are the "audio grade model" (*Link to Toroidy*)

 4th November 2017, 03:33 PM #2913 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders Find the total of all the secondary circuit resistances. Find the open circuit secondary voltage. Ipk = V/{total of secondary resistances} But this is what happens when closing a switch on the secondary side after the transformer has already started. It is a worst case. In practice the transformer secondary develops a rising output as the core flux builds during the start up phase. This gives a slowing effect to the initial charging current. __________________ regards Andrew T.
 4th November 2017, 05:33 PM #2914 anatech   diyAudio Moderator     Join Date: Jun 2004 Location: Georgetown, On Hi Kay Pirinha, And that is my point exactly. There is usually a "happy point" where you have more than enough capacitance for the job at hand. Going beyond that typically causes various troubles. The use of a soft-start circuit helps the initial surge current, but the continuous charge pulses is called "hot switching current". This is what you need to be careful of. Those short duration peak currents can generate the hash, or noise that can be picked up by other circuits. Hi Ejje, It is generally okay to increase capacitance by 20% or so, but over that wouldn't be recommended. Any changes related to greatly increasing capacitance is generally an artifact of expectation bias. This is assuming a competently designed device with a reasonable amount of supply capacitance. There are times when excessive capacitance will actually help a poorly designed device, but correcting bad engineering with more bad engineering isn't generally going to result in a good balance for performance. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife
 24th November 2017, 11:58 AM #2915 Gonefishing   diyAudio Member   Join Date: Jun 2015 Location: Thailand Hi everyone, I have just purchased the Honey Badger boards and ordered most of the board components. I also ordered the UPS boards, I have a 1000VA 230V , 55V+55V toroidal transformer which I would like to use, is this too much? Should I order something with lower output voltages? I see from previous posts that the highest secondary voltages quoted for this build( that I have seen) are 45V.
 24th November 2017, 06:58 PM #2916 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders The Honey Badger can use 35Vac, or 40Vac transformers. You might get away with 30Vac to allow very high bias currents. There may be some reports on using 45Vac transformers. You will need to search to see how successful they were. 55Vac is far too high. __________________ regards Andrew T.
helitim
diyAudio Member

Join Date: Dec 2015
Location: Newfoundland
Quote:
 Originally Posted by AndrewT The Honey Badger can use 35Vac, or 40Vac transformers. You might get away with 30Vac to allow very high bias currents. There may be some reports on using 45Vac transformers. You will need to search to see how successful they were. 55Vac is far too high.
Mine is one of the 45V builds. It is still not assembled. Hopefully once I've finished installing my floors I will get a chance . I believe the build guide uses a similar 800VA - 45v x 2 to what I am using.

Random advice: If I had my time back, I would have chosen 30V - 40V secondaries. My current rails will be a little on the high side. I guess it depends on what you are driving with it

 25th November 2017, 06:28 PM #2918 Gonefishing   diyAudio Member   Join Date: Jun 2015 Location: Thailand Thanks Andrew, I thought that was probably the case :-)
Gonefishing
diyAudio Member

Join Date: Jun 2015
Location: Thailand
Quote:
 Originally Posted by helitim Mine is one of the 45V builds. It is still not assembled. Hopefully once I've finished installing my floors I will get a chance . I believe the build guide uses a similar 800VA - 45v x 2 to what I am using. Random advice: If I had my time back, I would have chosen 30V - 40V secondaries. My current rails will be a little on the high side. I guess it depends on what you are driving with it
Cheers for the advice Helitim, I'll go for 40V secondaries. I'm building some power hungry speakers so would like a bit of welly :-)

yngvejos
diyAudio Member

Join Date: May 2015
Quote:
 Originally Posted by helitim Mine is one of the 45V builds. It is still not assembled. Hopefully once I've finished installing my floors I will get a chance . I believe the build guide uses a similar 800VA - 45v x 2 to what I am using. Random advice: If I had my time back, I would have chosen 30V - 40V secondaries. My current rails will be a little on the high side. I guess it depends on what you are driving with it
Why would you choose 30-40V instead?
I have been running 800va with 45V secondaries (63V rails) since 2015 in my HB and It's still going strong.
I have tested it into a 4r dummy load close to clipping. The only thing that failed was the dummy load (4R 50W submerged in water) when I ran square waves through it.

I would choose 45V secondaries again if I should build another HB.

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