Grundig 97 radio converting 240 to 220 (Techniek Radio/TV)

door Huub , 27.11.2012, 18:11 (4381 dagen geleden) @ Mike Horne

Hello Mike ,

you can use a low voltage transformer on the 240 mains and take (about) 220 out ,
i.g. an 240 to 20 , use the 2 coils serial for 240 in , take the 221,5 out at the original 240 .
Current for the radio is through the 20 V coil , so a small transformer with secondary 1 A is enough .

240 at (240 +20 ) gives theoretic (240/260) x 240=221,5 out .

More information is here , take care that the secundary is with the right site on the primary ,
otherwise you transform UP , measuring first !! before the poor Grundig is to radio-heaven .

http://www.nfor.nl/archief/index.php?id=127835

A more common transformer , 240- 24 , gives about 218 .
(240/(240+24))x 240 = 218

b r Huub