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Group buy: DCT03 DC trap (filter) for toroidal transformers
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Old 25th September 2018, 04:55 AM   #111
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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Join Date: Apr 2002
Location: Göteborg, Sweden
Group buy: DCT03 DC trap (filter) for toroidal transformers
The DCT03 pcb doesn't need any insulation washers so you can use metal screws and spacers only. Why does the green board need nylon washers? Too small creapage distances?
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SSR03 group buy. Sign up for interest HERE. 14 pcb's in order. 0 paid.
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Old 26th September 2018, 10:59 AM   #112
AmpUtator is offline AmpUtator  United States
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Quote:
Originally Posted by peranders View Post
The DCT03 pcb doesn't need any insulation washers so you can use metal screws and spacers only. Why does the green board need nylon washers? Too small creapage distances?
Thanks, I'll remove the washers on the DCT03.

On the Fo-Felix pcb's (Rev #1) there was not enough clearance around the mounting holes so it was suggested to use nylon washers above and below the pcb.
I have several Rev #1 pcb's.

That has been fixed in Fo-Felix Rev #2.
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Old 8th October 2018, 09:04 PM   #113
dtossan is offline dtossan  Canada
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Default Diodes 1 or more in series

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Originally Posted by peranders View Post
DCT03
Dear P-A
Your design allows 1 to 4 diodes to be string in series.
I understand having more diode strings in parallel increases current capacity.

Is there an advantage in just using 1 diode in each string - in that it limits the voltage drop across the blocker capacitor to just the Vf forward voltage drop of the 1 diode. Which then results in lesser current thru the cap and a lower voltage rated cap with smaller size - so that I can use larger capacitance caps with even higher ripple current rating?

Your thoughts greatly appreciated.
Denis
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Old 9th October 2018, 04:11 AM   #114
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
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Join Date: Apr 2002
Location: Göteborg, Sweden
Group buy: DCT03 DC trap (filter) for toroidal transformers
You can't find 4 V caps or 1 V for that matter. I recommend 10 or 16 V to be safe. How many diodes you use is only a matter of cost and ripple current capacity. Four diodes in series allow you to have smaller caps and at the same time catch higher a DC voltage.
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SSR03 group buy. Sign up for interest HERE. 14 pcb's in order. 0 paid.
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Old 9th October 2018, 03:15 PM   #115
dtossan is offline dtossan  Canada
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Quote:
Originally Posted by peranders View Post
You can't find 4 V caps or 1 V for that matter. I recommend 10 or 16 V to be safe. How many diodes you use is only a matter of cost and ripple current capacity. Four diodes in series allow you to have smaller caps and at the same time catch higher a DC voltage.
Oh I get it. You are saying that if mains DC offset is higher than Vf of a diode, the diode will conduct and DC blocking by the caps is compromised. Thus you string several diodes in series to achieve higher effective Vf to deal with mains DC offset up to 4V.
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