fireworks1
New Member
This is a post that is going to be ridiculed but I need to ask the
question. I have just tested the Bridge rectifier in my transformer-less
power supply that uses the 12VAC input voltage from an actual power supply.
The reason for no transformer is that it is a school project and we are just trying to
understand basic circuit function of Voltage Regulator, Capacitors and the
Bridge Rectifier. However I believe I have returned
with what seem like strange results... or maybe I am just being
stupid and can't quite realise it at the moment.
I input 12VAC (I measured it to be 11.7VAC) to the bridge rectifier.
On the output side of the bridge rectifier I get about 15.2VDC.
It seems to have stepped up the voltage...?
The only thing I believe may be correct is this.
Say the input voltage is 12VAC, then that means 12V RMS.
12 * 1.4 = 16.8 Vpeak AC
Considering that there is a 1.4volt drop across the
diodes in the bridge configuration, that means there will
be about
15.4 Volts output.. DC?!
Is this correct or am I on the wrong track?
question. I have just tested the Bridge rectifier in my transformer-less
power supply that uses the 12VAC input voltage from an actual power supply.
The reason for no transformer is that it is a school project and we are just trying to
understand basic circuit function of Voltage Regulator, Capacitors and the
Bridge Rectifier. However I believe I have returned
with what seem like strange results... or maybe I am just being
stupid and can't quite realise it at the moment.
I input 12VAC (I measured it to be 11.7VAC) to the bridge rectifier.
On the output side of the bridge rectifier I get about 15.2VDC.
It seems to have stepped up the voltage...?
The only thing I believe may be correct is this.
Say the input voltage is 12VAC, then that means 12V RMS.
12 * 1.4 = 16.8 Vpeak AC
Considering that there is a 1.4volt drop across the
diodes in the bridge configuration, that means there will
be about
15.4 Volts output.. DC?!
Is this correct or am I on the wrong track?
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