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You know that transformer that has the references erased? How do you know the voltage and current of the transformer? After installing a rectifier bridge and the filtering capacitor, you can do some tests to see if your transformer is suitable for your devices. To try to help people get an idea of the current (amperage) that a transformer has, I recorded this video showing how I test, and I tried to comment on my opinion on the subject. I hope it is helpful! (A note, which I did not make clear in the video: IT WILL ALWAYS BE NECESSARY TO USE A RECTIFIER BRIDGE AND CAPACITOR AT THE TRANSFORMER OUTPUT, BEFORE PERFORMING THE TESTS I DID IN THIS VIDEO.) How long will it take for your battery to charge? • 107 What is the IDEAL Charging Voltage for your... How to Recover Batteries: • # 116 - Do not discard your old batteries... Testing a battery that has been recovered: • Video How to Maintain Your Motorcycle Battery: • # 94 Do not replace your motorcycle battery... How to Make a Motorcycle Battery: • # 100 How I made a Lithium Battery for My... Various Homemade Battery Chargers: • Charging 12v batteries Check out some products, visit Our Blog: https://kadumagalhaes.blogspot.com.br/