I am reading through the experiments Volume of the E-book and I built the Sensitive Voltage Detector with the parts I had available to me. It kinda works, but I have a question.
The question I have is how to read the specs on a audio transformer.
The link to the experiment page is : http://www.allaboutcircuits.com/vol_6/chpt_3/12.html
The parts lists mentioned a 120:6 Step down audio transformer.
I went to radio shack and purchased the only thing labeled "audio transformer".
I am trying to figure out what the ratio is on it but the packaging doesn't tell you what the ratio is as plainly as I would like.
It says the input is 70Ω and the output is 0.7Ω.
When I measure it with my meter I read ~63.5Ω on the input and ~0.5Ω on the out.
How do I figure out what the ratio is or put it in a format that resembles X:Y ratio.
I understand that to get the ratio you divide X by Y.
I get 127, but I am having a retard moment and don't remember how to put it in terms of a ratio.
The reason I am posting this is because I am not getting the sensitivity the experiment suggests. This makes me think the ratio is way off what I need.
Specs for the Transformer:
Impedance: 1Khz, 1V,0mADC
Input: 1Lohms +-10%
DC Resistance (input):70Ω +-20%
DC Resistance (output):0.62Ω +-20%
Frequency Response: 300-10,000Hz +-3dB
Insulation Resistance: > 100MΩ @ 100VDC
The question I have is how to read the specs on a audio transformer.
The link to the experiment page is : http://www.allaboutcircuits.com/vol_6/chpt_3/12.html
The parts lists mentioned a 120:6 Step down audio transformer.
I went to radio shack and purchased the only thing labeled "audio transformer".
I am trying to figure out what the ratio is on it but the packaging doesn't tell you what the ratio is as plainly as I would like.
It says the input is 70Ω and the output is 0.7Ω.
When I measure it with my meter I read ~63.5Ω on the input and ~0.5Ω on the out.
How do I figure out what the ratio is or put it in a format that resembles X:Y ratio.
I understand that to get the ratio you divide X by Y.
I get 127, but I am having a retard moment and don't remember how to put it in terms of a ratio.
The reason I am posting this is because I am not getting the sensitivity the experiment suggests. This makes me think the ratio is way off what I need.
Specs for the Transformer:
Impedance: 1Khz, 1V,0mADC
Input: 1Lohms +-10%
DC Resistance (input):70Ω +-20%
DC Resistance (output):0.62Ω +-20%
Frequency Response: 300-10,000Hz +-3dB
Insulation Resistance: > 100MΩ @ 100VDC
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