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 What size PSU?

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Metz
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Call Sign : 26-CT-3517
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QTH or Location : Doncaster South yorkshire
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PostSubject: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 2:14 am

Hi guys, sorry if this has been asked (I did have a search)
What size power supply would I need with a superstar 6900?
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Sydthecat
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 6:00 am

12 amp psu would be fine but as always it's not a bad idea to go even bigger if you can



Craig
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Pagan
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 6:08 am

A 20amp PSU should be plenty big enough. I use a CRT-SS9900 radio which is more powerful than the SS6900 and it draws 12 amps so I'm assuming the 6900 will draw less current and require a smaller PSU. However, you might want to upgrade your radio in the future so I would suggest you buy the biggest PSU you can afford (I use a 30amp....link below).  

https://www.moonraker.eu/amateur-radio/power-supplies/qj-1830sb-30amp-linear-power-supply-unit

See post above too.
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26TC62
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 7:52 am

Been looking around myself because I recently fried something when a little linear PSU went wrong and stuck 20v into some gear, and it is noticeable that hardly any PSUs on sale have overvoltage protection. They may have current limiting and short circuit protection, but actual overvoltage...nope.
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Metz
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 8:46 am

Thanks for the reply’s guys. I was looking at 20 amp unit so that puts my mind at ease a little.
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Cozzmik
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 9:00 am

This is important as i have seen a couple of cheap switchmode 30 amp psu`s go open circuit and fry radios so with this in mind i have for many years used large amp lorry batteries with a decent trickle charger that way i get all the amps needed.I am aware i have a outside workshop with the batteries in a small well vented outbuilding but my suggestion for a psu is find one with protection built in and preferably a linear psu not switchmode.

Many use switchmode psu`s with no issues but for me using HF radios i wont take the chance.

Radioworld do some linear psu`s
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Northern Crusader
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 6:05 pm

Cozzmik wrote:
This is important as i have seen a couple of cheap switchmode 30 amp psu`s go open circuit and fry radios

Not possible to do because of how switch mode PSUs work.  Switch mode PSUs fail to off. There's a feedback loop which monitors the voltage and turns it off if it goes out of spec and when a mosfet goes bang it goes open circuit. If anything is damaged it's the IC driving them, not what is being powered by them which is why mosfets are used.

They don't and can't fail like a linear PSU which will happily put the full voltage of the secondary winding to the output terminals.

Quote :
Many use switchmode psu`s with no issues but for me using HF radios i wont take the chance.

Whereas because I know how a switch mode works and the very high levels of protection in a switch mode PSU, even the cheap ones, and the very notable lack of any over-voltage protection in a linear even the most expensive as very few fit a crow bar circuit, I'll not put my HF gear anywhere near a linear.
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Cozzmik
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeMon May 04, 2020 6:25 pm

Northern Crusader wrote:
Cozzmik wrote:
This is important as i have seen a couple of cheap switchmode 30 amp psu`s go open circuit and fry radios

Not possible to do because of how switch mode PSUs work.  Switch mode PSUs fail to off. There's a feedback loop which monitors the voltage and turns it off if it goes out of spec and when a mosfet goes bang it goes open circuit. If anything is damaged it's the IC driving them, not what is being powered by them which is why mosfets are used.

They don't and can't fail like a linear PSU which will happily put the full voltage of the secondary winding to the output terminals.

Quote :
Many use switchmode psu`s with no issues but for me using HF radios i wont take the chance.

Whereas because I know how a switch mode works and the very high levels of protection in a switch mode PSU, even the cheap ones, and the very notable lack of any over-voltage protection in a linear even the most expensive as very few fit a crow bar circuit, I'll not put my HF gear anywhere near a linear.


While i bow to your superior knowledge about absolutely everything you comment on i will take my reference from Madmark1 who has commented on switcmode vs linear psu`s. I know what i have seen so i will stand by my comment...i prefer lorry batteries over psu`s but i have a couple of very old linear type which at over 35 yrs old still do the job...
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karelgol
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PostSubject: Re: What size PSU?   What size PSU? Icon_minitimeFri May 22, 2020 9:22 am

I use server PSU's which have OVP, in fact i have to adjust them from 12.2V to 13.7, but can't go higher because of the OVP.
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