UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

kalee20 · 23rd Mar 2023, 10:54 pm

OK - In the absence of anything better, it would be difficult to disagree with those figures - on the contrary, you could hardly do any better!

The ripple is a bit big. Upping the capacitance will reduce it, and hopefully demonstrate that the secondary current hardly changes.

The 65.5VA... is this calculated from the RMS value of the peaky current waveform and the nominal 15V secondary voltage? If so, it's certainly showing that the transformer throughput is a lot more than the rated 40VA that the OP has at his disposal, with the 3A DC load.

23rd Mar 2023, 10:54 pm	#49
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,082	Re: Transformers in parallel? OK - In the absence of anything better, it would be difficult to disagree with those figures - on the contrary, you could hardly do any better! The ripple is a bit big. Upping the capacitance will reduce it, and hopefully demonstrate that the secondary current hardly changes. The 65.5VA... is this calculated from the RMS value of the peaky current waveform and the nominal 15V secondary voltage? If so, it's certainly showing that the transformer throughput is a lot more than the rated 40VA that the OP has at his disposal, with the 3A DC load.