V3 Universal Power Supply Circuit Board

[Jason]

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.

• Build Guide [New!]
• Product Information Page
• Bill of Materials
• Schematic
• Mechanical Diagram

[Lavcat]

Is there a schematic for the board? Or am I missing something obvious?

[kyrill]

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?

[jdg123]

Thank you for offering such excellent boards but yes, as above, I'd like to know what will be needed to populate those boards!

[Jason]

Schematic and BOM coming very soon...

[HoneyBadger]

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).

[brianhiatt]

Just put my order in, look forward to trying your board out.

[BobEllis]

Originally Posted by HoneyBadger

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.

[Jason]

Thanks Bob....

The following are now available:

• BOM
• Schematic
• Mechanical Diagram

[BobEllis]

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