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Old 9th July 2013, 10:15 AM   #1
Jason is offline Jason  Australia
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Default V3 Universal Power Supply Circuit Board

This thread is for discussions about the new Universal PSU, Capacitor and Diode Combination Board V3. For more information on this product, please see the product page below.

Last edited by Jason; 27th November 2013 at 08:34 AM.
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Old 14th July 2013, 04:53 AM   #2
Lavcat is offline Lavcat  United States
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Is there a schematic for the board? Or am I missing something obvious?
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Old 14th July 2013, 10:50 AM   #3
kyrill is offline kyrill  Netherlands
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Hi Jason
What would help given its presumably "universal" character is the min and max specs and a component list for the diverse output voltages amperes?
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Old 14th July 2013, 02:29 PM   #4
jdg123 is offline jdg123  United States
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Thank you for offering such excellent boards but yes, as above, I'd like to know what will be needed to populate those boards!
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Old 14th July 2013, 02:43 PM   #5
Jason is offline Jason  Australia
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Schematic and BOM coming very soon...
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Old 14th July 2013, 10:37 PM   #6
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Maybe I am asking for too much here but could someone post an equation that could help calculate output voltages with variable values represented by the component identifier (for example: R1).
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Old 22nd July 2013, 03:51 PM   #7
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Just put my order in, look forward to trying your board out.
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Old 24th July 2013, 06:01 PM   #8
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Quote:
Originally Posted by HoneyBadger View Post
Maybe I am asking for too much here but could someone post an equation that could help calculate output voltages with variable values represented by the component identifier (for example: R1).
Output voltage ~ (1.4 * VAC) -1.2 (1.2 varies depending on the forward voltage drop of the diodes chosen and operating current, see the data sheets, but 1.2 will get you in the ballpark) Subtract a bit more if you go with the CRC option.

R1 (optional) etc. are your call. You probably want to keep the net of the paralleled resistors under 0.1R although there are bound to be some differences of opinion. If you don't want to go CRC, just jumper one or more positions.

R9, R18 (bleeder) again your call. Pick a value that will bleed off your caps in a reasonable amount of time without dissipating too much heat. Around 50-60V try 4.7K/4+ W.

R21, R28 LED current limiters. You pick to set your LEDs at desired brightness. R = (V-Vf)/I Where V is rail voltage, Vf is forward voltage drop of your LED and I is desired current. Typical values for Vf are blue=5V, green=2V, red=1.2V Probably close enough for calculating R without going into the datasheet. I find most blue LEDs are too bright at 5 mA, YMMV.

R11, R12, C17, C18 - Snubber, optional. The values on the board are general purpose, your needs may vary depending on your particular transformer, rectifiers and capacitors. You can feed your amp high frequency square waves at near max power and look for ringing on the rails as you adjust values. There are ways to calculate values, look for the snubberized thread.

There is a snubber on the rectifier board, also optional, as above.

Hope that helps.

Last edited by BobEllis; 24th July 2013 at 06:04 PM.
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Old 25th July 2013, 09:07 AM   #9
Jason is offline Jason  Australia
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Thanks Bob....

The following are now available:
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Old 25th July 2013, 01:13 PM   #10
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The link in the BOM is to the snubber article I was unable to find. Glad you've got a better memory/storage system than me, Jason
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