Power supply ripple
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#1 Power supply ripple
Hi-for my "Doddington" ECL82 amp i am going to use a pair of 6D22S damper diodes (like Andrew I).
If i use a shottky diode in series with each one (AFTER) is it likely to make a noticable difference to the ripple ?
If not why not ?
If i use a shottky diode in series with each one (AFTER) is it likely to make a noticable difference to the ripple ?
If not why not ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#3
Hi-the diode passes only the positive cycle of the AC wave,but ripple is a small AC component of the DC created.
So would another diode not remove the negative aspect of the ripple,making it less ?
So would another diode not remove the negative aspect of the ripple,making it less ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#4
But after each diode, you have half of a sine wave, adding one or more diodes won't alter that. It might have some effect on the switching noise, but I can't see how it would affect ripple.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#5
Hi-so the ripple is a positive only component !
Right,i understand now.
Right,i understand now.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#7
Not entirly, its AC, so has positive and negative parts, but as its superimposed on a much bigger DC component its effectivly all +ve (or -ve, depending what you call 0)Hi-so the ripple is a positive only component !
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- andrew Ivimey
- Social Sevices have been notified
- Posts: 8307
- Joined: Mon Jun 11, 2007 8:33 am
- Location: Bedford
#8
Philip, go to nutshellhifi.com, Lynne Olsen's website and have a long read.... the sort of website that needs taking to the bath with a few cooling drinks.
Olsen's discussions mainly cetnre on transformer coupled push pull amplifier design. But he also discusses why damper diodes are the finest recifiers bar none this side of proxima centauri. They are much faster than any other rectifier, drop only a few volts and are very cheap.
I used them because I've bought a few for my 'Amity' project and apart from two arriving broken from Ukraine and one going down on the journey to out last meet, I am otherwise very happy with them.
I am also crackers ennough to have 866, 872, 5U8C, 83(in use in 300b amp) and 6X4 type rectumfriars just waiting for their chances to be used.
GZ34s may be marvellous but ....
Style friend ... !
Olsen's discussions mainly cetnre on transformer coupled push pull amplifier design. But he also discusses why damper diodes are the finest recifiers bar none this side of proxima centauri. They are much faster than any other rectifier, drop only a few volts and are very cheap.
I used them because I've bought a few for my 'Amity' project and apart from two arriving broken from Ukraine and one going down on the journey to out last meet, I am otherwise very happy with them.
I am also crackers ennough to have 866, 872, 5U8C, 83(in use in 300b amp) and 6X4 type rectumfriars just waiting for their chances to be used.
GZ34s may be marvellous but ....
Style friend ... !
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#9
Hi-i have ordered 8 of the super diodes,4 for the amp and 4 spare.
Came to £23.59 in all.
Came to £23.59 in all.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#10
Hi-i was reading an article about power supplies (cant remember where) and it was saying the choke and 2nd cap were where the power reserve was,particularly the choke.
But it did not explain how/why the choke was a "resevoir" !
Is their a maxim regarding choke size in a power supply ?
For example,in my doddington ECL82 power supplies (dual mono) what is likely to be the practical difference between a 10h choke and a 30h choke ?
But it did not explain how/why the choke was a "resevoir" !
Is their a maxim regarding choke size in a power supply ?
For example,in my doddington ECL82 power supplies (dual mono) what is likely to be the practical difference between a 10h choke and a 30h choke ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#11
A choke will store energy as electromagnetic flux in its core. A choke with tray and maintain a constamt current flow. In the same way as a cap will store energy in the form of electrostatic charge between its plates, and try and maintain constant voltage.But it did not explain how/why the choke was a "resevoir" !
Simple put, this is the point where knowing some basic theory is usefull.
You can imperically explore the difference using PSDII
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.