GB for Salas SSHV2 regulator

[roger57]

Michael,

Got your email, please accept my apologies for the mess-up.


My order is:
2x PCB
3x Transistor kit
3x Resistor kit
Included $8 shipping.

Total $86

Thanks,
Gary

 

[RollE2k]

Tea-bag: can i just buy SSHV2 transistor & resistor kit? (no pcb)

 

[syyma]

Payment for SSHV2 GB

Michael,

Just paypal for:

2x SSHV2 board $24
2x Transistors $20
2x Resistors $16
1x Shipping $ 6
Total $66

Thank you for your time and effort to make this GB happening.

Regards,

Sidney

 

[cotdt]

the full kit includes the transistor and resistor kit but not pcb, correct?

 

[Tea-Bag]

the full kit includes the transistor and resistor kit but not pcb, correct?

Correct, but also heatsinks and caps.
Full list is on second 'sheet' in spreadsheet.

 

[cotdt]

What is BIB? I am having trouble understanding the excel sheet.

 

[Tea-Bag]

Bib is low voltage board, 3.3v -45v

 

[ihear21khz]

Made payment of US$60 for items as listed in spreadsheet and indicated in Paypal message.
Thanks,
David

 

[cotdt]

Bib is low voltage board, 3.3v -45v

I see. So I would use the BiB to power the filaments of the tubes and use the high voltage boards for the B+ supply

 

[Tea-Bag]

I think that's too much current for a BIB, they are more appropriate for solid state power supply re-engineering. But Salas might be able to say more.

 

[cotdt]

I think that's too much current for a BIB, they are more appropriate for solid state power supply re-engineering. But Salas might be able to say more.

Can it do 3A at 5V? It's OK if not. I have a DAC and its analog section that can make use of it, as well as a 40W power amp.

 

[Salas]

You should use high power very well sinked Mosfets, not the standard ones. Rather the IRF640 & 9640 variety. Thermally inefficient especially on the CCS Mosfet that will have to run the Ih current plus some margin across a minimal 7V in-out drop.

 

[Salas]

If you need go near 3V with a Mosfet you should use a logic level shunt position part. The likes of FQP50N06L.

 

[cotdt]

Thanks Salas! I will try it when I get my boards.

 

[rickmcinnis]

Sent my money and a request

THANKS very much to you and of course to the sainted Mr. Salas for this!

Would you show a picture of a suitable heatsink for the project? I have no idea how to size a heatsink and would like a baseline of what I need to get.

Take care,

 

[Tea-Bag]

Got the payment Rick, do you have a target voltage and current? It will depend on that to a degree. I would think a 3 x 4" one with 1 1/2 fins would be a good guess. Bigger is better here. The one I used in post one was too small.

 

[Tea-Bag]

I also have the following for .50 USD each shipped, one per board allowed if you guys are interested in them. People who previously paid, let me know if your interested.
I have not used it personally, other than using a mass of them to tune a speaker cross over.


.33uf GE cap

If you want them, put it in the paypal notes. Thanks.

 

[rickmcinnis]

Application detail

Michael,

Now that I know your name from the PAYPAL payment!

My application will be 280 to 300 volts out - 15 mA for the "tubes" plus the 20 mA required.

What do you think?

Thanks, again,

 

[Tea-Bag]

Rick, I don't feel confident enough using the calculators to give totally reasonable advice,
but 300v @ .035A gives 10.5Watts. So assuming a bunch of thermodynamics I never took in college, I would guess something that can shed 15 watts or more.

Volts Watts Amps Converter Tool Calculator

The heatsink calculators I have not figured out yet - but it would be nice to include some calculations in a revised build guide, or in Post 1 for example (which I can edit)

I often use CPU heatsinks from Surplus dead servers, and if it requires more than that, I use the Arctic Thermal epoxy to bind them together.

 

[Salas]

The 20mA part will burn on the output sink, the 15mA part will go to the tubes. That 20mA will multiply by the output voltage to give the Watt to burn.

Natural convection heat sink