24v/48v PSU Halfwave rectified vs Fullwave

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Spencerleehorton

Spencerleehorton

Well-known member
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May 12, 2012
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Felixstowe, Suffolk, UK
Hi All,

Just wondered whether a halfwave rectified PSU (double the caps values from the fullwave version) is the same as a fullwave version, or there is some difference in the ripple (hum) produced?

Im rebuilding a Neve PSU which has a mod version of the SSL 9k PSU and the 48v side has failed, Im using a single turn secondary rather than 2 secondaries, didnt know if i was wasting my time in the long run to upgrade to fullwave?
 

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Both power supply circuits that you posted are full wave rectified. If you only use one diode then it would be half wave, and in that case you definitely have more ripple.
 
ah ok, whats the avantage or disadvantage of using single secondary winding to feed diodes as opposed to two AC feeds and a 0v?
I thought a single secondary winding was halfwave? as in a 24v and a 0v AC.
 
Spencerleehorton said:
ah ok, whats the avantage or disadvantage of using single secondary winding to feed diodes as opposed to two AC feeds and a 0v?
I thought a single secondary winding was halfwave? as in a 24v and a 0v AC.
Click to expand...

Decent info here...

https://www.hammfg.com/electronics/transformers/rectifier
 
> Decent info here...

Hammond persists in posting that rubbish.

Fer example: how can a CAPacitor have precisely different peak and average? 0.71 and 0.45? Yes they are different but by the ripple action which is not remotely covered in that image.
 
Doesn't really answer my question which is better and why?
I'm interest in what's the best way to build a psu to have as little ripple as possible.
I have some single winding 24v txf and double winding 12v  txf.
Using a diode bridge seems to be the best way.
And using a 0.1uf then a 1000uf, then 78xx or lm317/783 then 1000uf, 0 1uf.
Then the appropriate resistors and caps on the adjust leg.

By just changing the power txf what would the advantages disadvantages be?
 
Spencerleehorton said:
Doesn't really answer my question which is better and why?
Click to expand...

Sorry...Was trying to point out the full wave/half wave differences...

Spencerleehorton said:
I have some single winding 24v txf and double winding 12v  txf.
Using a diode bridge seems to be the best way.
Click to expand...
Confusing a bit what you are trying. The first drawing uses a 40vct transformer ? Do those caps raise the power?


PRR said:
> Decent info here...

Hammond persists in posting that rubbish.

Fer example: how can a CAPacitor have precisely different peak and average? 0.71 and 0.45? Yes they are different but by the ripple action which is not remotely covered in that image.
Click to expand...

I'm too inexperienced to fact check.... Maybe I should've posted in the Brewery first.... ???
 
Spencerleehorton said:
Doesn't really answer my question which is better and why?
I'm interest in what's the best way to build a psu to have as little ripple as possible.
I have some single winding 24v txf and double winding 12v  txf.
Using a diode bridge seems to be the best way.
And using a 0.1uf then a 1000uf, then 78xx or lm317/783 then 1000uf, 0 1uf.
Then the appropriate resistors and caps on the adjust leg.

By just changing the power txf what would the advantages disadvantages be?
Click to expand...

Full wave is better since you need a smaller capacitor than using half wave to obtain the same ammount of ripple. Full wave with a bridge makes better use of the transformer voltage, since full wave with only 2 diodes will output the half the voltage of the transformer secondary , both have the same ripple characteristics thou. So yeah, the best way to go is usually with a bridge rectifier.
 

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