I am trying to repair a vintage computer terminal which has a fried power transformer. Most specs are not documented but I know the Primary(s) is 120V/240V AC, the Secondaries are 18V, 30V, 32V CT, and 20V CT. The input (in my case 120V) is fused at 1.25A.
I know I am extremely unlikely to find an exact replacement for this transformer, and I'm considering multiple parallel transformers to generate the required secondary voltages. I am not sure how to determine what the current rating on any transformer I source needs to be.
I have seen "The secondary current is equal to the product of the primary voltage and primary current divided by secondary voltage." Can I take the 1.25A fuse as the primary current (it must actually be somewhat less, no?) and use this in the calculations? For the CT secondaries, do I calculate (for example) the -10V -- +10V current, or do I need to also consider the 0 -- +10V current (which would be higher, if this calculation is right?)
My current thoughts are:
(120V * 1.25A) / 18V = 8.33A
(120V * 1.25A) / 30V = 5A
(120V * 1.25A) / 32V = 4.69A
(120V * 1.25A) / 20V = 7.5A
Thanks!
I know I am extremely unlikely to find an exact replacement for this transformer, and I'm considering multiple parallel transformers to generate the required secondary voltages. I am not sure how to determine what the current rating on any transformer I source needs to be.
I have seen "The secondary current is equal to the product of the primary voltage and primary current divided by secondary voltage." Can I take the 1.25A fuse as the primary current (it must actually be somewhat less, no?) and use this in the calculations? For the CT secondaries, do I calculate (for example) the -10V -- +10V current, or do I need to also consider the 0 -- +10V current (which would be higher, if this calculation is right?)
My current thoughts are:
(120V * 1.25A) / 18V = 8.33A
(120V * 1.25A) / 30V = 5A
(120V * 1.25A) / 32V = 4.69A
(120V * 1.25A) / 20V = 7.5A
Thanks!