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Old 16th Jul 2017, 4:46 pm   #1
radio_spirit
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Question Which power supply for Grundig Yacht boy 300?

Hi everybody,

I have recently acquired a Grundig Yacht Boy 300 at a local flee market. The unit is working perfectly on batteries, but there was no PSU included.

I would like to buy a suitable PSU for it, but do not know exactly which one it needs. Can anybody help?

It only says '7.5 V' on the device where you put the plug, and there is a round whole with a pin in the center. The exact model number is:

GRUNDIG YACHT BOY 300
Z.NR. 7.50027
(It also says 'BATT. 5x1.5V FTZ NR. U 101'. below).

Thanks in advance for your time,

Tim
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Old 16th Jul 2017, 5:52 pm   #2
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Default Re: Which power supply for Grundig Yacht boy 300?

7.5V sounds a safe bet from a mains PSU.

PS Welcome to our forum,I should have said first.
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Old 16th Jul 2017, 6:35 pm   #3
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Default Re: Which power supply for Grundig Yacht boy 300?

You can get "generic" power supplies with a selectable voltage output and a selection of plug tips to fit various appliances. A transistor radio should not need more than 300mA (but a higher-rated one will not do any harm). Watch the polarity, though. A lot of older kit had the centre pin as negative, although the more common standard today is for the centre pin to be positive. If in doubt, check for continuity between the centre pin of the input socket and each battery terminal.
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Old 16th Jul 2017, 6:58 pm   #4
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Default Re: Which power supply for Grundig Yacht boy 300?

the 300B has a centre negative so its presumably, though not necessarily the case for the 300. This model uses 4.5 volts however. I agree with the suggestion of buying a multi power supply I have one running my dab radio and it has been fine.
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Old 17th Jul 2017, 5:49 pm   #5
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Default Re: Which power supply for Grundig Yacht boy 300?

The schematic, which is available on this site, tells me that the centre pin is positive and requires 7.5 volts. I see that a Sangean DAB Radio 7.5 volt power supply, which has the right polarity plug, costs 9 from a well known source. What I can't tell is if the plug diameter is correct. A little work at your end will solve the question.

Chris nee Simpsons
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Old 19th Jul 2017, 7:13 am   #6
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Thumbs up Re: Which power supply for Grundig Yacht boy 300?

Thanks heaps guys! I will check it, order a PSU and let you know how it worked out.
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Old 19th Jul 2017, 12:18 pm   #7
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Default Re: Which power supply for Grundig Yacht boy 300?

... by the way, just check that the PSU provides a Regulated output. That is, on no load (nothing connected to it) the voltage is still 7.5 Volts. There was a range of PSUs sold that provided an unregulated output. For these the 7.5 Volt setting, on a small load like a transistor radio, could well be 12 or more Volts. Such a voltage would damage your radio.
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Old 19th Jul 2017, 2:30 pm   #8
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Default Re: Which power supply for Grundig Yacht boy 300?

Might it be possible to get the correct Grundig supply on Ebay perhaps?
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Old 19th Jul 2017, 3:26 pm   #9
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Default Re: Which power supply for Grundig Yacht boy 300?

Quote:
Originally Posted by SteveCG View Post
... by the way, just check that the PSU provides a Regulated output. That is, on no load (nothing connected to it) the voltage is still 7.5 Volts. There was a range of PSUs sold that provided an unregulated output. For these the 7.5 Volt setting, on a small load like a transistor radio, could well be 12 or more Volts. Such a voltage would damage your radio.
I have noticed this with a couple of AC adapters I own, I didn't know the specifics behind it though.
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