This Transformer 6V 1A .A transformer rated for “12V” out should put that out at its maximum rated output current. That means it probably puts out more when unloaded. For some transformers, that could be significantly more, like up to 50% more.Keep in mind that 12V AC will result in a higher rectified DC voltage. This is because the 12V spec is RMS. For a sine wave, such as your power voltage, the peaks will be sqrt(2) times higher than the RMS level. The peaks will be 17V for the case of 12V RMS. If this 12V transformer secondary is followed by a full wave bridge to make DC, then about 1.4V will be lost in the diodes. That leaves about 15.6V DC. Again, it may be somewhat higher when unloaded. 20V DC with no current drawn wouldn’t be too surprising.
যোগাযোগঃ 69/E পান্থপথ, ঢাকা 1205
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