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Old 28th April 2009, 08:53 PM   #11
disco is offline disco  Netherlands
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Quote:
Originally posted by hilbert_mostert
Wel... going to buy the parts then. I had to make some changes because the Edcor trafos are very expensive here in the netherlands. I have found a Hammond classic HV 260G which has the following specs:

Primaries: 110V, 120V, 220V or 240V
Secondaries: 275-0-275 200mA
5V 3A
6,3V 5A
You might consider this one.
Is the remaining ripple less than 50mV?
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Old 29th April 2009, 11:39 AM   #12
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Hi,


I've purchased a whole set here in Holland at AE-europe and are very nice and helpful people, they build very good (output)transformers and chokes from what i've red/heard. they will arrive next week so i'll keep you posted about the progress and of course the quality.
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Old 29th April 2009, 11:56 AM   #13
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Where did you get the figure of 110 ohms for the resistance of the transformer? It seems a bit high to me. Its effect is to reduce the output voltage of the PSU.
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Old 29th April 2009, 11:59 AM   #14
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The 110ohms was calculated by PSUD2 when i filled in the specifications of the transformer, i am not sure if it is the right value.
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Old 29th April 2009, 03:43 PM   #15
disco is offline disco  Netherlands
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The 300 ohm for L1 seems highish too but no worry. In case your tension turns out too high you can implement an extra RC filter.

On the other end, the first cap (47uF) is maximal permitted. To give the EZ81 a long life @100mA the total resistance of the transformer secundary must be no less than 200 ohm. You can fix this with series resistance, see the datasheet for explication.
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Old 29th April 2009, 04:11 PM   #16
pointy is offline pointy  United Kingdom
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have a look at any schemo's that are on the the internet that are anything like the design you are thinking of.
as they may help you with ideas and any power ratings.

the best way to do it is to start with the oldest first so you can follow the development of designs like the one you are thinking of.

that way you will get a better feel of what you need.
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