SSLV1.1 builds & fairy tales

[Salas]

24 AWG umbilical is no problem until 1.4 Ampere for seven strands per wire

 

[MASantos]

I found a 12x2x24 cable, might be a bit overkill then. I'll try to find a 6 pair cable then.

 

[king4joy]

Its the power. 9610 will blow if you run say 2A for a T-Amp constantly in a CCSed shunt reg. You will need BIG sinks also. 9640 is heavy duty. Slower than 9610 of course. Use it to replace both 9610 and 9530. You can find it easily in the open market.

Received the sslv1.1 boards from GB.
Now can start to put together a sslv1.1 for my T-Amp.

In your other thread, you mentioned setting 2.5A for the T-Amp.
I may like to try from 2.0A to a max of 2.5A with this sslv1.1.

You recommend to use 9640(11A) to replace both 9610(1.75A) and 9530(12A).

Can I use two 9530 ? or two 9540(19A)?

 

[Salas]

Better the 9530 which is acceptably fast given your power circumstances

 

[KevinHeem]

Does anyone have a part number for these little washers with the shoulder that work in the TO-220 transistors. I had my boards in and out so many times I crushed some of the shoulders. Luckily I had extra mini-kits I could steal from, but now I need to replace them.

 

[Tea-Bag]

Does anyone have a part number for these little washers with the shoulder that work in the TO-220 transistors. I had my boards in and out so many times I crushed some of the shoulders. Luckily I had extra mini-kits I could steal from, but now I need to replace them.

It's Keystone 3049

 

[KevinHeem]

Does anyone have a part number for these little washers with the shoulder that work in the TO-220 transistors. I had my boards in and out so many times I crushed some of the shoulders. Luckily I had extra mini-kits I could steal from, but now I need to replace them.

 

[Salas]

3049 Keystone Electronics | Hardware, Fasteners, Accessories | DigiKey

 

[xcj999]

I want to build a salas shunt for a waveio board and was wondering if someone could be so kind and help me figure out if I am on the right path. I am pretty new to all of this so apologies in advance if my questions are stupid.
So the waveio needs 5v and around 0.4-0.5 A

I was thinking about getting a 15 Vac 50VA r-core (could 30va be enough with an r-core?) After reading a little bit it seems better set the ccs a bit higher so i went for 620ma, and setting the load consumption to 300ma. This gives me a heatsink requirement of 2,69 °C/W for Q101 (6,2W) and 10,42 °C/W for Q106 (1,6W).

I have a hard time finding out heatsinks that have "low" enough values. Do you think this one would be ok? Is there enough space between 101 and 106 to fit 2 of them?

I was planning using the layout like you see in the attachment pic. The airvents of the case run along the back where the iec (power plug) is. Do you think this should work or is there not enough air flow? I know placement below the airvents would be better, but i would like to keep the ps a bit away from the waveio/dac.

another way for lower temps could be to simply use 12vac transformer - what do you think about that?

 

[Salas]

12V Tx is more than enough. Derate the sinks by 30%. With SSLV you can use flat side-sink also. Or you can alternatively make a Reflektor-D which is more straightforward to set for digital and has on board sinks space. 9VAC Tx and 1R R1 for it. 30VA Tx is enough in both cases.

 

[xcj999]

thanks for the reply salas flat side sink is not built in the case - do you mean ordering one and just putting it inside the case?

so temperature in a Galaxy Maggiorato case is not an issue for the reflektor at 0.6 A ccs?

 

[Salas]

Either that or using the case itself for sinking if thick metal mass. That box you linked has kind of full side sinks already. You could exploit those finned sides. Either way the MOSFETS will need isolation hardware (Silpads and nylon grommets).

 

[xcj999]

*lol* i didn't realise i could use these as sinks ;-) Will try it out. What should be the max. operating temperature to not affect the fet negatively?

 

[Salas]

60C on the MOSFET body is pretty safe long term max

 

[xcj999]

perfect, thanks! will make sure to stay below that

 

[king4joy]

Received the sslv1.1 boards from GB.
Now can start to put together a sslv1.1 for my T-Amp.

In your other thread, you mentioned setting 2.5A for the T-Amp.
I may like to try from 2.0A to a max of 2.5A with this sslv1.1.

You recommend to use 9640(11A) to replace both 9610(1.75A) and 9530(12A).

Can I use two 9530 ? or two 9540(19A)?

Thankyou Salas, I will use all 9530.

Would you also suggest brand and values for the other critical parts (such as capacitors and rectifiers...etc..etc) best for this application please??

Cheers,

King

 

[rhythmsandy]

salas how much should the voltage input to the board in DC in order to get 12V at the output? is it 5V DC above 12V? or higher? the load consumption will be about 200ma and quiescent current thinking of using 600ma to 1A so how much should be the input voltage in DC?

 

[Salas]

No less than 5V difference when the mains are at their lowest predictable

 

[Salas]

Thankyou Salas, I will use all 9530.

Would you also suggest brand and values for the other critical parts (such as capacitors and rectifiers...etc..etc) best for this application please??

Cheers,

King

I would still prefer TO-247 which have better thermal transfer like IRFP9240 IRFP240. Rectifiers should be TO-220 types and main filter caps no less than 10000uF. About brands and models is up to you.

 

[nashbap]

Need some confirming advice please

Just received my new boards and IRF kits from TeaBag. Look great.

For a balanced BA3FE with two transformers and thus two + and two - boards

1) R101 resistor- does the quality of the resistor (ppm value) matter here. I need around a 2W one. Any suggestions?
2)The build guide suggests MKT's for C102 and for C104 but I see several builds with E caps. instead at C101 and C103. Which is preferred? Each phase load around 100ma and shunt 200ma, so 300ma thru R101.
3)The build guide suggests that wiring should be twisted pairs. Should that be +F and +S, or +F and -F, etc

Thanks. Nash