Can I get an approximate output value of a transformer based on secondary resistance? I have a Korg line mixer. The primary windinding weathered away and I can't access it. resistance on the secondaries is 3.7 to center tap for each lead. I found one in a CD player that seems to work but I don't know the voltage of the original. I am near certain that the transformer I tried is a little on the weak side.
The secondary resistance should not vary with time and assuming a standard 600 ohm input would have little effect on any signal levels. Try using a constant line source with and without the transformer and see if the output levels change.
The secondary resistance has no real relationship to the voltage. 3.7 ohms could be many turns of thin wire or less turns of a thicker wire. Both would be 3.7 ohms, one giving (say) 20 volts AC and the other 6 volts AC.
Thanks. I guess in a case like this, I look at the regulators and OP amps if I don't have schematic?
That was very intuitive. That link answered quite a few questions. On my other desk I currently have some Older dynaudio drivers and bits and pieces of amplifier, crossover and power supply. Seeing that Dynaudio has followed every other Brand and their trends, I am glad that I opted against buying a pair. 10 years ago, Dynaudio Studio monitors were great but they are beginning to look like overpriced MP3 monitors like the Blue Skys I just sold.
Thank God for this forum! It makes true Hi fidelty attainable. I am also learning how to fix the broken stuff to keep the LoFi neighbors happy.
Thank God for this forum! It makes true Hi fidelty attainable. I am also learning how to fix the broken stuff to keep the LoFi neighbors happy.
Way to go.
That and power consumption.
Measured resistance can be used at most to distinguish "which is which" , and even so, it can still mislead you.
Say, you have a transformer for a small tube amp (say, a Champ), the HV winding will have, say, over 60 or 120 ohms DCR while the filament one less than 1 ohm.
Piece of cake 🙂
Now you have a transformer for a big SS amp: 40+40VAC for the main power amp, and 15+15V for the preamp.
The 80V winding will usually have *less* resistance than the 30V one 😱 , simply because the first one will be required to furnish, say, 5 to 10A while the second one may be happy with 100 mA.
And as a side note, low resistances are difficult to measure with precision ... unless you have a bridge or a dedicated meter.
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