musicman1101
- Jun 23, 2022
- 9
- Joined
- Jun 23, 2022
- Messages
- 9
be determined
the transformer is missing from a kr350 roland keyboard.
the transformer is missing from a kr350 roland keyboard.
Correct, 9-0-9 will have 18V. Not sure of your load. Expect 15+ volts. Possibly 17Volts at the bridge rectifier.I should be able to I put the load only on the outside tappings and ignore the center 0 volt pin? correct?
The keyboard states that it uses 35 watts at 117 vac. Can an estimate be made as to the lowest current requirements iu would need? Kellys_ eye suggested 1 amp and better yet 2 Amps. Using a much larger one say 5 or 10 amps should be ok, as long as my rectifier voltage is close to 12 -15 volts?Correct, 9-0-9 will have 18V. Not sure of your load. Expect 15+ volts. Possibly 17Volts at the bridge rectifier.
Martin
Close enough. You don't expect 100 % identival values. You always have to account for parameter tolerances.I have -15.52v and +15.01 on my first two filter caps
Thats about 1 % deviation from +9 V and - 9 V, good enough in many if not most cases.-9.09v and +8.89 coming out of my 9 volt regulators.