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Speaker Turn On Delay and DC Protector Board Set (V3)
Speaker Turn On Delay and DC Protector Board Set (V3)
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Old 16th June 2019, 08:27 PM   #361
stephen1212b is offline stephen1212b  United States
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Join Date: Apr 2012
Location: Petaluma
Could someone please verify my proposal.

I have already assembled with 24 Volt relays similar to the turn on delay circuit. I am perhaps unnecessarily concerned about the resistive bridge between channels. My idea is to bypass one relay and use two boards one for each channel so back to 24 volt power and no resistive connection between channels.

While I think that should work I’m also now realizing that I was intending to use this in a balanced bridge output amplifier so do I need to break both leads to each speaker? If so is there any reason not to replace the relays with DPDT 12 volt so all connections could be broken to both speakers with a single board?
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Old 11th August 2019, 04:53 AM   #362
Hook is offline Hook  United States
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Join Date: Feb 2015
Location: California
Default Unsure of relay spec I need

Hello,
I'm new to electronics, so I've found figuring out what kind of power supply to use and how to match the relays to the power source confusing, so I'm not sure if I understand this correctly.


I gather that the relay has to be sized for both the power source used to power the protection board and the power output of the amplifier that you are protecting the speakers from. I'll be using this for an F6 (and probably other first watt amplifiers in the future)

I'm going to use a 400va power supply for the amplifier (antek 4218 transformer), which is rated a 18v + 18v (36v). If I wanted to
power the board from the 4218 transformer, I would pull power from only one side and I would use the two 12vdc relays from the 24v version, correct?

If I decided to power the board from a separate transformer I could use the antek 0124 transformer or equivalent and use the same 12vdc relays.

I definitely am not sure how to make sure this is sufficient for my amplifiers output power (f6, powered by the antek 4218 transformer). Would using
the 12v relays rated for 10 amps be enough?


Thanks, Jim
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Old 27th August 2019, 07:03 PM   #363
TransformerNoob is offline TransformerNoob
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Join Date: Jun 2019
Quote:
Originally Posted by Hook View Post

I'm going to use a 400va power supply for the amplifier (antek 4218 transformer), which is rated a 18v + 18v (36v). If I wanted to
power the board from the 4218 transformer, I would pull power from only one side and I would use the two 12vdc relays from the 24v version, correct?
I am also using a 36v transformer and need 24v for the speaker protector.

Have you come up with a solution?

Thanks
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Old 18th September 2019, 06:19 AM   #364
Hook is offline Hook  United States
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Join Date: Feb 2015
Location: California
In searching and reading this thread I found there is also a thread for the previous version of the board which has useful information. I found that you can power the board with dc from your power supply. No changes are necessary, though you can leave out the rectifying diodes and the filter capacitor. In my case my power supply provides 24v+ and 24v-, so my protection board was set up with relays for 24v. The V2 thread mentions connecting your + to the protection board + terminal and your ground to the protection board - terminal.

Unfortunately I can't confirm how well this works, as a long period of time passed between finding this out and hooking up the protection board in my amp. I hooked up the protection board with 24v+ and 24v- instead of using my power supply ground. This caused some smoke to come from one of the resistors and damaged some other components. Rather than fiddle with a bunch of damaged parts I am just going to rebuild the board, as it is inexpensive. I'll let you know how it works out when I get complete the second board. For now my F6 will not have speaker protection . I do have concerns that my power supply will be slightly unbalanced from having power for the protection board coming from only one side. I am guessing that I will not be able to hear a difference.
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Old 30th September 2019, 04:20 AM   #365
spierdolony is offline spierdolony
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Join Date: Nov 2016
Does anyone know if this speaker protection board shorts to ground in the event of a failed relay?

Trying to understand how these tiny relays can protect an amp sufficiently?

Rod Elliot documents this approach in Loudspeaker Protection and Muting
I can't really tell from the schematic if it goes to ground or is just open?
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Old 5th October 2019, 06:51 PM   #366
whoaru99 is offline whoaru99
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Join Date: May 2010
Quote:
Originally Posted by spierdolony View Post
Does anyone know if this speaker protection board shorts to ground in the event of a failed relay?

Trying to understand how these tiny relays can protect an amp sufficiently?

Rod Elliot documents this approach in Loudspeaker Protection and Muting
I can't really tell from the schematic if it goes to ground or is just open?
It appears to me the relays open the circuit between amp and speakers in the event of detecting DC at the amplifier output.
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