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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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25V/70V Transformer identification
I have a large number of small line to voice transformers that came
out of a very large municipal facility These are all from different manufacturers. Some are tapped to watts and some are different. I would like to re employ these on a current project which will require 70V units , but I do not know whether they are 25V or 70V transformers. Can anyone suggest an easy way to determine this? I have tried comparing them with known transformers, however resistance readings are too variable to determine anything concrete. Thanks, Lenny |
#2
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25V/70V Transformer identification
On 6/17/2012 4:15 PM, klem kedidelhopper wrote:
I have a large number of small line to voice transformers that came out of a very large municipal facility These are all from different manufacturers. Some are tapped to watts and some are different. I would like to re employ these on a current project which will require 70V units , but I do not know whether they are 25V or 70V transformers. Can anyone suggest an easy way to determine this? I have tried comparing them with known transformers, however resistance readings are too variable to determine anything concrete. Thanks, Lenny The only way to know is to measure the turns ratio, if they are unmarked. Turns ratio squared* low side impedance = the high side impedance. Then use the formulas I posted earlier to determine the wattage at 70.7 V. |
#3
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25V/70V Transformer identification
You got any kind of signal generator ? Feed ot woth that and measure voltage and it is a matter of simple math.
J |
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