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SS class A amp PSU
SS class A amp PSU
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Old 10th January 2019, 03:53 PM   #1
merlin el mago is offline merlin el mago
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Default SS class A amp PSU

I'm looking for ideas to save money for the big caps required for class A SS amps PSU.

Cap multiplier.
SMPS.
Ultracapacitor.

Links to read the pros and cons are highly appreciated.

ALS70A334QS063 | Condensador de aluminio KEMET ALS70A334QS063, 0,33F, +-20%, 63V dc, Montaje en Panel, 5mΩ, 90194 +85degC, Electrolitico | RS Components

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Last edited by merlin el mago; 10th January 2019 at 03:58 PM.
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Old 10th January 2019, 06:35 PM   #2
sq225917 is offline sq225917  United Kingdom
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He'll, they aren't cheap. How about a bank of 10,000uf Panasonic TS caps instead?
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Old 10th January 2019, 08:03 PM   #3
merlin el mago is offline merlin el mago
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I don't have space, also Erno Borbely advice is minimum 47.000uF each cap.
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Old 11th January 2019, 11:43 AM   #4
DF96 is offline DF96  England
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You could start by deciding what ripple you need, and then calculating what cap size you need for the reservoir and smoothers.
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Old 11th January 2019, 12:09 PM   #5
scottjoplin is offline scottjoplin  Wales
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Cornell Dubilier caps are very good value for money
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Old 11th January 2019, 12:18 PM   #6
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by DF96 View Post
You could start by deciding what ripple you need, and then calculating what cap size you need for the reservoir and smoothers.
Ripple to be ≤ 0.8 mVolts, how can calculate?

Bias +-50V 2.15A
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Old 11th January 2019, 03:32 PM   #7
DF96 is offline DF96  England
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I am sure someone, possibly me, has already told you that in previous threads. Why do you always start from scratch in terms of knowledge for every item you design? Do you never make any notes?

You calculate ripple by calculating the charge lost from the reservoir capacitor (Q=It) during the period between charging pulses, then using the capacitor equation V=Q/C to find the voltage drop.
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Old 11th January 2019, 03:38 PM   #8
merlin el mago is offline merlin el mago
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1st time seen this formulas.

(It) is a spec can find in the cap datasheet?
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Old 11th January 2019, 03:42 PM   #9
scottjoplin is offline scottjoplin  Wales
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I and t are SI units
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Old 11th January 2019, 03:46 PM   #10
merlin el mago is offline merlin el mago
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I'm sorry still don't understand.
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