Depending on Preamp actual consumption (3.5mA per TL072 class Op Amps, about 8 mA for 5532 class) you may easily get your +/-15V from available rails (nominal +/-25V), easy peasy with 2 resistors, 2 zeners, 2 100uF caps.
No need for extra transformers, windings or regulators.
No need for extra transformers, windings or regulators.
Well, in india local custom transformer makers keeps that in mind (Main line tolerance).....& i never faced such worse scenario in my entire DIY life.
Regards
Please dont confuse. I am not doubting transformer winders. The post was about giving winders general specifications so I get desired transformer voltages at my home.
Yes. The tone amp board as shown previously has rectifier, filter and regulator on board and from dual +/- voltages I will supply single rail to phono board too. But since I am custom winding I have option to have separate winding for Tone board+phono board on same transformer. Since I dont have data about Phono Preamp IC (AN360) maximum voltages. I will go by Spec sheet which came with phono module (0-12V DC). So separate lower voltage than (amplifier's 15-0-15ac) will be safe I think.
thanks and regards
Where i live (near kolkata) the variation in main voltage is quite consistent, most of the time 200~230. The primary windings of my all custom made transformer is rated at 220VAC & i never faced any problem so far. The variation in secondary voltage is next to nothing
(+/-0.5v-1V MAX).
(+/-0.5v-1V MAX).