Re: Wine Fridge Power Board
Because of material variances and manufacturing process variances, not all components will be exactly the same. That is why they are specified with a tolerance value in percent, which shows how much the part may deviate from the marked value.
If your 0.1uF capacitor is rated at 10%, then it can be anywhere between 0.9uF and 1.1uF and still be considered OK. They do not have to be exact.
If a part is outside its specified tolerance, it's either bad quality, damaged\faulty, or has drifted with age. In all cases it should be replaced.
Finding replacements for SMPS transformers is hard as they are often custom designed for each supply. There are some exceptions though (yours might be a "standard" EE-19 (Don't quote me on that!) but in any case, the transformers practically never fail, so it's not the first part to suspect as faulty by any stretch - unless it's visibly damaged.
A transformer with a 1:1 ratio would be used for isolation\coupling. Some SMPS designs might use a 1:1 transformer for part of a feedback loop for example.
Could be, but often they use standard parts and scrape the numbers off so you don't know what they used, so you can't copy the design (or realise they've ripped yours off!)
Originally posted by acornish
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If your 0.1uF capacitor is rated at 10%, then it can be anywhere between 0.9uF and 1.1uF and still be considered OK. They do not have to be exact.
If a part is outside its specified tolerance, it's either bad quality, damaged\faulty, or has drifted with age. In all cases it should be replaced.
Originally posted by acornish
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A transformer with a 1:1 ratio would be used for isolation\coupling. Some SMPS designs might use a 1:1 transformer for part of a feedback loop for example.
Originally posted by acornish
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