Hi
i have a question about the chice of toroids: i'm building the aleph 4 and i don't understand if the right multiplier is 1.41 or 1.2.... For this amp is better a toroid with 35v secondaries or 40v?
Tnx
Federico
i have a question about the chice of toroids: i'm building the aleph 4 and i don't understand if the right multiplier is 1.41 or 1.2.... For this amp is better a toroid with 35v secondaries or 40v?
Tnx
Federico
Hello Lacasacorp,
The right multiplier is 1.4142 .
The transformer with 2x34 V secondaries should be used for the Aleph 4 amplifier.
Regards,
Kristijan Kljucaric
The right multiplier is 1.4142 .
The transformer with 2x34 V secondaries should be used for the Aleph 4 amplifier.
Regards,
Kristijan Kljucaric
Go to <a href="http://www.duncanamps.com">Duncan Amps</a> and download the free PSUD program. It's quite simple and intuitive to use, and you can model you power supplies to a much greater degree of accuracy. I've found it quite close to what I eventually built. Tip: I find it easier usually to use the load as a current source rather than a resistor, especially for class A circuits. It's a right click option.
To answer your original question, yes 1.4142 is the theretical ratio, and will vary depending on the real properties of the components used, hence my suggestion for PSUD.
HTH
To answer your original question, yes 1.4142 is the theretical ratio, and will vary depending on the real properties of the components used, hence my suggestion for PSUD.
HTH
The 1.2 figure is an approximation which "accounts" for
various losses including diode drop, ripple voltage, and
the loading down of the transformer and the primary
power source.
The 1.4 figure is highly idealized and assumes "perfect"
components.
1.2 times AC voltage is a good working number if you
don't want to perform a lot of analysis.
various losses including diode drop, ripple voltage, and
the loading down of the transformer and the primary
power source.
The 1.4 figure is highly idealized and assumes "perfect"
components.
1.2 times AC voltage is a good working number if you
don't want to perform a lot of analysis.
Thank you for the answers.... So is ok a couple of 625VA vith 40-0-40 secondaries?
If i foud a voltage higher than 48 volts after the capacitor is a problem for the amp?
TNX
Federico
If i foud a voltage higher than 48 volts after the capacitor is a problem for the amp?
TNX
Federico
Yes that should be fine 625VA per channel is quite good and a little extra voltage on the rails will not hurt as the design is very tolerant of such changes you may just find that the amps runs a few degrees hotter all in all probably not a huge problem.
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