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 Post subject: coronado 650a power supply
PostPosted: Apr Mon 29, 2019 8:11 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
hi I was requested to share my version of a battery eliminator


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coronado ps.JPG
coronado ps.JPG [ 136.24 KiB | Viewed 552 times ]
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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 12:57 am 
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Joined: Apr Mon 15, 2019 9:54 pm
Posts: 72
Location: San Francisco, CA
I've got a Coronado 650A radio also. I'll have to post some pics of it. Mine is powered by AC/DC kit that I bought for Antique Electronic Supply in AZ. Works great!


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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 1:01 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 32032
Location: SoCal, 91387
Thx Rich! Can you advise where to get the power transformer? Is the brand name Antek?

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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 1:42 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
hi you can get it on Ebay or you can just go onto the AnTek site and order there.
Rich :D


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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 1:47 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
I got this at the Antek site under transformers, 25va, AN2040. it is 11 dollars plus shipping.
their transformers are very nice at an excellent price
Rich


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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 2:08 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
sorry the transformer is AN-0240
:roll:


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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 4:30 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
trying to down load the picture of the battery eliminator


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File comment: this is a working supply connected to my Coronado 650a dimensions are 6x3x3
coronado power supply rs1.jpg
coronado power supply rs1.jpg [ 219.13 KiB | Viewed 469 times ]
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 Post subject: Re: coronado 650a power supply
PostPosted: Apr Tue 30, 2019 7:29 pm 
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Joined: Apr Mon 15, 2019 9:54 pm
Posts: 72
Location: San Francisco, CA
This is the one I used. $55 for the kit.
https://www.tubesandmore.com/products/kit-power-supply


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 Post subject: Re: coronado 650a power supply
PostPosted: May Wed 01, 2019 1:11 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
hi how does it work? is it free from hum?
it looks that it is based on the LM317 like mine.
Rich :)


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 Post subject: Re: coronado 650a power supply
PostPosted: May Wed 01, 2019 1:50 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7848
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
fifties wrote:
Thx Rich! Can you advise where to get the power transformer? Is the brand name Antek?


In this part of the country, VHF boosters were gathering dust under flea market tables for years and you could buy them for $5 or $10. Most of them have a power transformer that is 120vac primary with 120vac and 6vac secondaries. In addition they have chassis', sockets, etc for other projects.

But .... the transformers would work peachy for this project.

I built something almost identical to this PS many years ago to use on 90vdc/2vdc battery sets. At the time I posted it here and was told that I couldn't use LM317's on the B+ .... I'd be going to hell or maybe worse. It worked just fine.

cheers


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 Post subject: Re: coronado 650a power supply
PostPosted: May Wed 01, 2019 4:32 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
Hi yes you can use the LM317 it is floated and protected with a zener diode (30-36 volt and a 5 volt across the input, see my drawing) I am using it and it works great. I thought at one time that too.
I know that there is not enough head room with the 6 volt winding, in theory it should work but you will still have ripple at the output. I used a 1000uf capacitor maybe if was tripled in size it may work. I do know that I had to add windings to the torroid to make it work. I am very pleased with the performance.
Rich :D


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 Post subject: Re: coronado 650a power supply
PostPosted: May Wed 01, 2019 7:27 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7848
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Rich berg wrote:
Hi yes you can use the LM317 it is floated and protected with a zener diode (30-36 volt and a 5 volt across the input, see my drawing) I am using it and it works great. I thought at one time that too.
I know that there is not enough head room with the 6 volt winding, in theory it should work but you will still have ripple at the output. I used a 1000uf capacitor maybe if was tripled in size it may work. I do know that I had to add windings to the torroid to make it work. I am very pleased with the performance.
Rich :D


Hi Rich,

Thank you for the answer. Just for the record .... I used one of those VHF tuner transformers and no zeners etc. I didn't scope it, but I had no "audible" hum. If I couldn't hear it, I wasn't going looking for it with test equipment.

LM317's are tougher than we think ...

cheers


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 Post subject: Re: coronado 650a power supply
PostPosted: May Wed 01, 2019 8:25 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
HI John, you bring back memories! I haven't worked on a TV for about 40 years :lol:
Rich


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 Post subject: Re: coronado 650a power supply
PostPosted: May Sun 05, 2019 8:41 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
finished battery eliminator


Attachments:
power supply box 2rs.jpg
power supply box 2rs.jpg [ 213.86 KiB | Viewed 255 times ]
power supply box 1rs.jpg
power supply box 1rs.jpg [ 241.47 KiB | Viewed 255 times ]
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 Post subject: Re: coronado 650a power supply
PostPosted: May Sun 05, 2019 8:48 pm 
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Joined: Dec Sat 24, 2011 9:17 pm
Posts: 4256
Location: Vancouver Island, Canada
Wow, that is nice. Thanks for the inspiration.

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 Post subject: Re: coronado 650a power supply
PostPosted: May Mon 06, 2019 2:56 pm 
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Joined: Jun Mon 12, 2017 8:17 pm
Posts: 49
Hi John, thank you.
Rich


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