RTR SSR Speaker Protection GB5

[xrk971]

I thought you were referring to the SSR as connected to the SMPS situation as shown a few posts above. If you are referring to Mikebarney’s use of a mains relay to control power on/off of the SMPS 630SO, I think that may or may not work since the tpa3255 15v rail just needs to stay up longer than the HV rail to prevent thump. I do think it would be wiser to use a 12v external signal and relay to activate the “STDBY” logic pin for graceful shutdown.

 

[wirewiggler]

No I have a pair of your RTR speaker protectors in a case I am repurposing for the Wolverine with Sami’s Cobra S2 power supply. I will be putting out multiple amps in my living room and was thinking of using a selector switch to control SSR’s for powering the selected amp.

 

[kreinke19]

I have a pair of the original (GB1? Dated July 2019) RTR speaker protectors and would like to sell them. Is there any interest in them or are they too old?

 

[xrk971]

The Gen 1’s you have work just as well as latest ones as long as you don’t need to use them in a balanced output amp. If you have a need for using them on a balanced amp I can do an exchange for you for the cost of shipping plus $22.

 

[kreinke19]

Thank you for the generous offer. I already bought a set of the GB5s in order to get the power supply PCBs. I will be able to use an unused power transformer output from my monoblock to power the device.

 

[nautibuoy]

Hi X. it's been a while. I have an unused pair of your version 2.1 speaker protection boards - I'll need to remind myself of how to implement them and find the bonus low-cap PS boards, which seem to have gone walkies, but fundamental question first - are V2.1 boards OK to use in an amp with +/-150VDC power rails? I'm not sure when you switched to using the 150V mosfets and a search hasn't provided the answer yet. Cheers.

 

[xrk971]

I think v2.1 is HV and can handle 150v. Best way to know is take a photo and post here. Need part number of the MOSFET.

 

[nautibuoy]

Thanks X, image attached.

 

[xrk971]

150V 80A MOSFET from Infineon.

https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d462700c0ae6017015d4682a2212

Looks like you are ok for using it on 150Vpp or 53Vrms 350W into 8ohm amp.

 

[kissabout2002]

Hi X,

I just been referred by other member about your speaker protection, going straight to the question, I just finish to built a Tim Mellow OTL tube amplifier with +/-150 vdc power rail and as you know OTL are not using output transformer making the life of speakers in danger in the case of failure of one of the power tube 6C33C, in the original schematic there is already some form of protection but really not so safe, so do you think your RTR SSR can be combined with this tube amp?
Thank you

Acky

 

[nautibuoy]

X, it was me that referred @kissabout2002 and my use case is potentially the same Tim Mellow OTL amplifier.

 

[xrk971]

The +/-150v supply means it is a 300Vpp application and the MOSFETs cannot take that. Jhofland, the designer said he wouldn’t recommend it.

 

[kissabout2002]

Thank you X, but anyway the max output for this amp is 25 watts over 8ohm, around 42Vpp

 

[nautibuoy]

I think your protection modules will be OK with the Mellow amp X.

BTW, I located the low-cap bonus boards and pleasantly surprised to find you included the transistors.

 

[xrk971]

Actually, the bonus board with transistors is not the low cap PSU but a logic driver board to activate the on board open collector gates. The low cap PSU was with the next Gen.

Easy to make though. 2 diodes for half wave bridge, 10uF cap, LED and resistor to indicate power on. Schematic somewhere.

@kissabout2002 - if 42Vpp this SSR board will work perfectly fine.

 

[nautibuoy]

Ah, OK, thank you X, I obviously didn't look closely.

 

[chermann]

Hi X

I am confused
i have the SSR board in my hand with V2.3 November 2021. But you write at the beginning of the new version v2.2 and 18.November 2022.

please clarify

thx
Chris

 

[xrk971]

Sorry that is my mistake. The latest is indeed the version you have in your hand. Should look like this:

I made a mistake on my labeling of the schematic. I need to correct that on post 1. Thanks for catching that.

 

[chermann]

Hi X,

thank you for clarification.
i am not ready with reading the main thread . so my version v2.3 is with the regulator 150v too? so no connection to X1 is needed?

thx
chris

 

[xrk971]

No connection X1 needed but leave J1 jumper installed in that case. X1 allows you to control the SSR remotely from a microcontroller etc with open collector logic which lets you daisy chain the SSR’s together with one open collector gate driving them.