SS class A amp PSU

[merlin el mago]

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

 

[sq225917]

He'll, they aren't cheap. How about a bank of 10,000uf Panasonic TS caps instead?

 

[merlin el mago]

I don't have space, also Erno Borbely advice is minimum 47.000uF each cap.

 

[DF96]

You could start by deciding what ripple you need, and then calculating what cap size you need for the reservoir and smoothers.

 

[scottjoplin]

Cornell Dubilier caps are very good value for money

 

[merlin el mago]

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

 

[DF96]

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.

 

[merlin el mago]

1st time seen this formulas.

(It) is a spec can find in the cap datasheet?

 

[scottjoplin]

I and t are SI units

 

[merlin el mago]

I'm sorry still don't understand.

 

[scottjoplin]

This should help Linear Power Supply Design

 

[merlin el mago]

That link really helps, thank you.

 

[scottjoplin]

Also this Charge, Current & Potential Difference