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Old 5th March 2013, 02:03 PM   #11
MelB is offline MelB  Canada
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You will be dissipating a LOT of energy to get 5v out of that. I would use a winding that is closer to your intended output voltage.
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Old 5th March 2013, 04:10 PM   #12
impsick is offline impsick  United States
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Quote:
Originally Posted by MelB View Post
You will be dissipating a LOT of energy to get 5v out of that. I would use a winding that is closer to your intended output voltage.
well my plan was to use a voltage quadrupler to get the 70v.
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Last edited by impsick; 5th March 2013 at 04:26 PM.
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Old 5th March 2013, 04:37 PM   #13
impsick is offline impsick  United States
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Here this is what I had in mind... Would this work or am I in need of exclusive windings? thanks.
Click the image to open in full size.
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Old 6th March 2013, 06:53 AM   #14
impsick is offline impsick  United States
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well I tested the schematic above, it works, but now the 70v rails are uneven.
any suggestions on how to compensate? Could this just be a case of tweaking resister values? Or any design techniques anyone can share? thanks in advance.
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Old 6th March 2013, 02:02 PM   #15
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Quote:
Originally Posted by impsick View Post
Could this just be a case of tweaking resister values?
Yes. the reg's ref voltage is usually listed as 1.2 to 1.3V. So potentially up to 8% difference between any 2 units. So tweak resistors to compensate.
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Old 6th March 2013, 03:01 PM   #16
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You can use the "2 Transistor Regulator" from Jones "Valve Amplifiers" -- the output voltage will be ~2x the value of the reference. It's good to around 40-50mA and very simple to implement.

Click the image to open in full size.

For more current use a Darlington transistor as the pass element.
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Old 6th March 2013, 07:55 PM   #17
impsick is offline impsick  United States
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Thank you all
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