YOu wanna to go to a lower frequency using tha same transformer, then reduce the power vs frequency to fit the classic formula:īmax = Vin/(4.44xAexFxN) If one knows the original design Freq, with both Ae & N fixed, simply substitute the classic equation to find F for a given core size. It makes sense that E guitar string is around 39Hz and designing the transformer to this frequency makes everything more portable. Taking the Mullard size example, an output transformer with LF cutoff at 40Hz for the same power would be designed perhaps 2/3rd smaller for the same power throughput.Ī specifically sized output transformer designed for 20Hz full power cutoff would be half the size at 40Hz for the same power. Generally, a High inductance implies good LF response for a given Bmax (excitation flux), however can also be achieved with large AE (core area) and /or lesser number of turns this last bit is ideal for the HF response and the designers biggest headache is maintaining the upper response with minimum losses. Becareful with the weight reasoning: large core area can imply extended LF range for a given size winding wire and modest power, the original 20W Mullard design stipulated a large core 50x150x125mm which bears little relationship with power throughput but can handle flat response below 10Hz.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |