promixe
Well-known member
Hi All,
I've been reading Jensen AN-002 to understand how impedances reflect between windings (page 2). My question is about the input transformer impedance section:
How exactly does he arrive at 225 Ohm figure?
The part above it:
..I think I understand: 2k43 * 16 + 2k5 + 92 = 41k5 (~42k)
But the 225 Ohm I can't reverse-calculate. Thanks for your help!
I've been reading Jensen AN-002 to understand how impedances reflect between windings (page 2). My question is about the input transformer impedance section:
we need to know what the transformer secondary "looks like", impedance wise, to the amplifier. If we assume that the primary is driven from the line in our previous output transformer example with its 80 Ohm source impedance, we can calculate that the secondary will "look like" about 225 Ohm to the amplifier input.
How exactly does he arrive at 225 Ohm figure?
The part above it:
We can calculate that this load will "look like" about 42 kOhm at the primary
..I think I understand: 2k43 * 16 + 2k5 + 92 = 41k5 (~42k)
But the 225 Ohm I can't reverse-calculate. Thanks for your help!