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Old 17th January 2013, 08:26 AM   #161
Art M is online now Art M  United States
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"The input cap should be high quality polystyrene ,very stable over time".

Can somebody give me a hint as to where I can find a 4.7uF Polystyrene dielectric capacitor? Or do I just misunderstand what cap is being discussed ?
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Old 17th January 2013, 11:15 AM   #162
AndrewT is offline AndrewT  Scotland
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............4.7uF Polystyrene dielectric capacitor? ...............
I have never seen one, but I would not be surprised to find it as big as a box of Cornflakes. And maybe cost the same as a small automobile.

4.7uF can be MKP, MKT, FKP, FKT, or electrolytic. If you read Marsh and others you will find many other viable options.

If going electrolytic to save space and money then use two 10uF bipolar electrolytics in series for an effective 5uF.
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Old 17th January 2013, 02:29 PM   #163
ncg2013 is offline ncg2013  United Kingdom
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OS, thanks for those explanations, just a couple more.
Will 40-0-40VDC give a power output into 4R of about 114W?
What is the formula for working out the rail voltage from the transformer secondary voltage?
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Old 18th January 2013, 10:06 AM   #164
AndrewT is offline AndrewT  Scotland
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...................Will 40-0-40VDC give a power output into 4R of about 114W? ...........
more like 120W to 160W into 4r0.
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Old 18th January 2013, 10:13 AM   #165
ncg2013 is offline ncg2013  United Kingdom
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Andrew, thanks for that.

I wanted to be at the top end of that, about 150W. Obviously if I up the supply to 45v it will do it, but you mentioned previously that this is not good for 4ohm loads. what else can be done?
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Old 18th January 2013, 10:34 AM   #166
AndrewT is offline AndrewT  Scotland
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What transformers are available?
That determines the PSU voltage.
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Old 18th January 2013, 10:39 AM   #167
ncg2013 is offline ncg2013  United Kingdom
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Any transformer I have not bought one yet...
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Old 18th January 2013, 10:42 AM   #168
AndrewT is offline AndrewT  Scotland
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transformer voltages 22, 25, 28, 30, 35 & 40Vac are generally available, although few if any manufacturers offer any more than three voltage options from that range.
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Old 18th January 2013, 10:54 AM   #169
ncg2013 is offline ncg2013  United Kingdom
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You mentioned that I could get between 120w and 160W, if I use a 40Vac transformer what else can I do to make sure it produces 150W into a 4R load? If anything!
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Old 18th January 2013, 11:31 AM   #170
AndrewT is offline AndrewT  Scotland
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40Vdc is not the same as 40Vac.
40Vac+40Vac can achieve 170W into 8r0 and over 300W into 4r0.
I have reported these results some 5 or more years ago in the Leach Thread.
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