J
Jon Danniken
- Jan 1, 1970
- 0
I'm building an unregulated 12V power supply, but I've run into an issue I
can't seem to resolve. The supply consists of a mains transformer that
converts 120VAC into 12VAC. The resulting 12VAC is fed into a full-wave
bridge rectifier, with the resulting output of ~12VDC.
Now obviously I need some filtering on that 12VDC, so I added a capacitor
between the (+) and the (-) output of the bridge rectifier. The resulting
output is filtered, but as a result the voltage at the capacitor is now
~17VDC.
I'm somewhat familiar with why this occuring, having built a voltage
multiplier in the past, but is there any "trick" to prevent it from
occuring, or possibly a way (other than a resistor network or a voltage
regulator) to reduce it afterwards?
Thanks for any suggestions,
Jon
can't seem to resolve. The supply consists of a mains transformer that
converts 120VAC into 12VAC. The resulting 12VAC is fed into a full-wave
bridge rectifier, with the resulting output of ~12VDC.
Now obviously I need some filtering on that 12VDC, so I added a capacitor
between the (+) and the (-) output of the bridge rectifier. The resulting
output is filtered, but as a result the voltage at the capacitor is now
~17VDC.
I'm somewhat familiar with why this occuring, having built a voltage
multiplier in the past, but is there any "trick" to prevent it from
occuring, or possibly a way (other than a resistor network or a voltage
regulator) to reduce it afterwards?
Thanks for any suggestions,
Jon