Hey Greg,
24V from protection board outputs.
12V relays must be wired in series.
I’m troubleshooting my protection circuitry at the moment. My regulator relays and protection board gave up some magic smoke last night
I cannot find fault with my wiring (see post #717) yet, as a temp solution I may bypass the regulator relays until I have time to investigate further.
J
You might want to have a look at the relay driver FETs on the protection board. A short here kills the smd FETs instantly with a tiny puff of smoke - been thereI’m troubleshooting my protection circuitry at the moment. My regulator relays and protection board gave up some magic smoke last night
Thanks John. After looking at the schematic a bit more, this makes sense. You have +24V on the "A side" of the ISR, RSR, LSP, etc which are connected to GND through the FET with the relay driver goes "high". So it appears that my second protection board is healthy.
My question is, how do the 12V relays I have on the muting circuit and regulator boards not simply burn up? I'm pretty sure I did not wire them up in series.
My question is, how do the 12V relays I have on the muting circuit and regulator boards not simply burn up? I'm pretty sure I did not wire them up in series.
Double voltage means qaudruple power dissipation over the coil resistace. That´s not necessarily a reason for a coil to burn if operated at room temperature ambient conditions and having the board as a heat sink.
But better go for series connection of two 12V relays to comply with the 24V provided by the protection board.
Markus
You might want to have a look at the relay driver FETs on the protection board. A short here kills the smd FETs instantly with a tiny puff of smoke - been there
> how do the 12V relays I have on the muting circuit and regulator boards not simply burn up?
Are you sure they are 24V ?
Bear in mind that you will have them continuously on, in an ambient which is about 45~50°C.
It is a different situation to have them on temporarily for a few seconds at 25°C, as Markus said.
If they were 12V I would definitely wire them in series.
But in doing so you are drawing double the current through the same switching FET.
See #717~720.
Patrick
Are you sure they are 24V ?
Bear in mind that you will have them continuously on, in an ambient which is about 45~50°C.
It is a different situation to have them on temporarily for a few seconds at 25°C, as Markus said.
If they were 12V I would definitely wire them in series.
But in doing so you are drawing double the current through the same switching FET.
See #717~720.
Patrick
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I may very well remember wrong, but I think it is only the loudspeaker relay driver that output 24V. I seem to remember that there are both positive and negative 12V regs on the board and that the loudspeaker relays see the full differential voltage -12V/+12V while the other relays only see half this (i.e. -12V/gnd or gnd/+12V).
Nick,
sorry if I jump in thread but very soon I will start to build my F5X and I am just reading all the various documents.
As per schematic from Patrick attached to the "130223 Protection Board F5X Chpt 1" all the relays refer to +24 so I think that all the relays coils should be 24V.
Enrico
sorry if I jump in thread but very soon I will start to build my F5X and I am just reading all the various documents
. As per schematic from Patrick attached to the "130223 Protection Board F5X Chpt 1" all the relays refer to +24 so I think that all the relays coils should be 24V.
Enrico
Hi Nic,
I think the logic was that if you use 12V relays and wire them in series you will be sure to cut both in an event of a fault of one of the channels ( for the output relays )
The muting relays are are less relevant but you will mute both inputs simultaneously for sure.
I'm also using 12v relays in series.
CV
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I can confirm that the published schematics corresponds to the PCB which is connected to +24V at one end and Gnd at the other, through a switching MOSFET.
Alexis is the one who supplies the kit, so you would have to ask him what has been supplied.
IF you do have 12V relays, you can, as a work-around :
1) wire two of them (left & right channel) in series, as discussed in post #767, or
2) wire each of them in series with a resistor which has the same resistance as the 12V relay coil.
Patrick
Alexis is the one who supplies the kit, so you would have to ask him what has been supplied.
IF you do have 12V relays, you can, as a work-around :
1) wire two of them (left & right channel) in series, as discussed in post #767, or
2) wire each of them in series with a resistor which has the same resistance as the 12V relay coil.
Patrick
These are the Mute relays and the Regulator startup relays, the automotive are the output relays, power relay is a Finder relay.
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What voltage drives the "mute" relays?
What do the Regulator start up relays look like and what is their part number and what is their drive voltage?
What do the Finder relays look like and what is their part number and what is their drive voltage?
Where is the spec for the Automotive relay? What is it's drive voltage?
What do the Regulator start up relays look like and what is their part number and what is their drive voltage?
What do the Finder relays look like and what is their part number and what is their drive voltage?
Where is the spec for the Automotive relay? What is it's drive voltage?