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Old 6th November 2011, 12:42 AM   #1
Dagwood is offline Dagwood  New Zealand
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Default Voltage Doubler ?????

Hi All

I'm planning a passive pre amp but would still like to see some glowing glass so plan to add a EM84 Vu meter (The Site for Electronics, Microcontroller, Tubes, Forum, PCB, Circuits, Onlineshop

I have a transformer with a 100v output and would like to use a voltage doubler to get close to the 250vdc needed using the design below. (option a)

My question is could I use a EB91 (6AL5) in place of the silicon diodes?

Cheers
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Old 6th November 2011, 02:41 AM   #2
AJT is offline AJT  Philippines
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6AL5's are low current diodes...try it an find out....

how much current do you need, i believe 10mA is obtainable....
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Old 6th November 2011, 08:57 AM   #3
Dagwood is offline Dagwood  New Zealand
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Hi

I only need 3mA

Tried it today, seems to work fine though output voltage varies a fair bit between the 6AL5 and the EB91's I have? they are all used stock so I'm guessing the variance is due to age.

Anyone else used these??
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Old 6th November 2011, 12:17 PM   #4
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The difference in voltage between different valves is probably exacerbated by the relatively high peak current. You may only be taking 3mA but assuming even modest value caps the conduction angle will be very low and the peak current quite high - could even exceed the peak rating of 54mA for the EB91.

Last edited by barrymagrec; 6th November 2011 at 12:27 PM. Reason: typo
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Old 6th November 2011, 02:30 PM   #5
diecast is offline diecast  United Kingdom
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Default 250v the easy way

When I made a level meter using that circuit I used a DC/DC converter I found on eBay designed as a power supply for nixie tubes - I powered that and the filament in the magic eye tube from a 12v wall wart.

Last edited by diecast; 6th November 2011 at 02:35 PM. Reason: added source
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