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Jason 10th December 2013 09:40 AM

Speaker Turn On Delay and DC Protector Board Set (V3)
2 Attachment(s)
This thread is for discussions about the new Speaker Turn-On Delay and DC Protector boards (V3). This is an updated version of the V2 boards, primarily to make them compatible with the 10x10 grid mounting pattern we've now standardized on so they can be easily mounted to Deluxe chassis baseplate, riser panels, front panels and/or heatsinks. Refer to the V2 discussion thread for additional information.

For more information on this product, please see the product page.

Change History
  • 2.0 First Production Release
  • 2.0.1 Added Board Dimensions
  • 3.0 New Layout
    • Double sided board
    • Added Keystone connectors as option
    • Conforms to 10mm mounting grid
  • For future changes
    • Add polarity markers for electrolytic capacitors

  • Product Page
  • BOM - Attached below (Now updated to V3.0.2) -- 3-paged BOM
  • Schematic - Coming soon
  • Dimensions - 100mm x 50mm

Gibbi 21st December 2013 02:45 PM


What is power limit for the DC protector boards?


UKToecutter 21st December 2013 10:30 PM

Relay spec says 5A @125VAC into a resistive load
However it also says 10A if the Normally Closed connection is not used (it isn't used on the Delay board).
625W theoretically but I won't be the brave soul who tries out the limit.

Spec of relay is here

KatieandDad 5th January 2014 04:29 PM

Is there a link anywhere to see the schematic for these to check if they are suitable for my application ?

UKToecutter 5th January 2014 04:36 PM

This is the current schematic;
It will be on the site shortly

It pretty benign and can be used in applications other than the F5 and F5T.
U1.1 is ground and U1.2 is + supply

BobEllis 9th January 2014 12:30 AM

Toecutter, what is the issue with this circuit and the F5 and F5T? Is it the impedance of the sense circuit relative to the low impedance feedback circuit of the F5? If so, would it be an issue with other CFB amps as well?

UKToecutter 9th January 2014 12:43 AM

I think you misunderstood what I said.
I don't believe there is any issue with this board and the F5 & F5T.
What I was saying is that I believe this would be suitable for many other amplifiers as well.

BobEllis 9th January 2014 12:55 AM

Ah, that was the way I read it first and then it flipped. Thanks.

bigkraig 30th January 2014 03:17 AM

Built mine out today and both LEDs light up continuously from the start, immediately engaging the relays.

Everything look right? I had my LEDs in the opposite from what I expected, I think I got everything else correct.

bigkraig 3rd February 2014 05:44 PM

So the 3.0 BOM has Q1,Q2,Q3,Q5,Q6 as 512-KSC945CGBU which are ECB according to but the board is made for EBC.

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