DC to DC converter 6v to 12v - UK Vintage Radio Repair and Restoration Discussion Forum

saxmaniac · 13th May 2012, 2:16 pm

Does anybody know where to find one of these. It is needed for Walkman WM-D6c (the pukka one!) There is a Sony branded one in there which may have only been used in this model. Does anything else contain such a device?

peteratnith · 13th May 2012, 2:55 pm

Hi Sax, do you mean the one in the square metal can? I managed to open and repair one a while ago, a low value .22ohms? resistor was OC. A possible cause of this failure is using a non Sony mains PSU. Sony used negative centre plugs and no protection against rev polarity. Unfortunately doing his often damages the motor drive chip too. A cheap source of DC/DC converters is old PC network cards. They often use a device with an isolated output so its possible to connect the output in series with the input to add the two.

Peter

Ed_Dinning · 13th May 2012, 7:43 pm

Hi Sax, you could also build your own, there are "boost converters" (chips) listed by all the major semiconductor manufacturers.
I believe there may be some evaluation cards available through Farnell (Element 14)

Ed

saxmaniac · 13th May 2012, 7:50 pm

Thanks for replies, I dont think it is due to reverse polarity as there is no other fault on machine. I am going to try to get into the case & attempt repair, but I will look at these other possibilities if no good
Geoff

13th May 2012, 2:16 pm	#1
saxmaniac Heptode Join Date: Oct 2007 Location: Birmingham, West Midlands, UK. Posts: 618	DC to DC converter 6v to 12v Does anybody know where to find one of these. It is needed for Walkman WM-D6c (the pukka one!) There is a Sony branded one in there which may have only been used in this model. Does anything else contain such a device?

13th May 2012, 2:55 pm	#2
peteratnith Retired Dormant Member Join Date: Jan 2008 Location: Glasgow, UK. Posts: 119	Re: DC to DC converter 6v to 12v Hi Sax, do you mean the one in the square metal can? I managed to open and repair one a while ago, a low value .22ohms? resistor was OC. A possible cause of this failure is using a non Sony mains PSU. Sony used negative centre plugs and no protection against rev polarity. Unfortunately doing his often damages the motor drive chip too. A cheap source of DC/DC converters is old PC network cards. They often use a device with an isolated output so its possible to connect the output in series with the input to add the two. Peter

13th May 2012, 7:43 pm	#3
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: DC to DC converter 6v to 12v Hi Sax, you could also build your own, there are "boost converters" (chips) listed by all the major semiconductor manufacturers. I believe there may be some evaluation cards available through Farnell (Element 14) Ed

13th May 2012, 7:50 pm	#4
saxmaniac Heptode Join Date: Oct 2007 Location: Birmingham, West Midlands, UK. Posts: 618	Re: DC to DC converter 6v to 12v Thanks for replies, I dont think it is due to reverse polarity as there is no other fault on machine. I am going to try to get into the case & attempt repair, but I will look at these other possibilities if no good Geoff