Electronic filter.
- pre65
- Amstrad Tower of Power
- Posts: 21373
- Joined: Wed Aug 22, 2007 11:13 pm
- Location: North Essex/Suffolk border.
#1 Electronic filter.
Saw this on Ebay just now.
Is it similar to the E-choke Mike H used to do ?
http://www.ebay.co.uk/itm/Tube-Preamp-A ... 1660715763
Is it similar to the E-choke Mike H used to do ?
http://www.ebay.co.uk/itm/Tube-Preamp-A ... 1660715763
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)
#2 Re: Electronic filter.
I was talking to MJ last Owston meet up about the pros and cons of such a circuit compared with a filter using a choke.
I admit I didn't fully understand - well I had consumed some beers.
Could someone enlighten me?
I admit I didn't fully understand - well I had consumed some beers.
Could someone enlighten me?
#3 Re: Electronic filter.
The circuit it there, its a cap multiplier
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Mike H
- Amstrad Tower of Power
- Posts: 20157
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#4 Re: Electronic filter.
Yes virtually identical to mine.
Which Nick G helped me with incidentally.
Which Nick G helped me with incidentally.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#5 Re: Electronic filter.
Still none the wiser. I assume using a choke must have advantages because it's weight and cost are disadvantages.
#6 Re: Electronic filter.
The mosfet cap multiplier will filter the DC. A Choke will do that, but will also store energy in its flux which the SS wont do. If a choke is used in choke input, then it has the magic feature of drawing continuous AC current from the transformer.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Mike H
- Amstrad Tower of Power
- Posts: 20157
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#7 Re: Electronic filter.
The electronic version needs an overhead of extra supply Volts, which can be quite awkward to provide. Or in other words, you lose some HT, in my one's case, about 25V minimum. So appreciably less efficient than a genuine inductor choke.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#8 Re: Electronic filter.
Thanks Nick and Mike.
-
- User
- Posts: 6
- Joined: Mon Jul 27, 2015 5:20 pm
#9 Re: Electronic filter.
Unitrode did a nice SMPSU in a high speed switcher, using current doubling which allowed us to use smaller caps with chokes, a nice design.
We re-worked it with a full resonant bridge circuit and made it RAD Hard and now they are whizzing over head in space. We also used Si plated in Gold.
We re-worked it with a full resonant bridge circuit and made it RAD Hard and now they are whizzing over head in space. We also used Si plated in Gold.
- Dave the bass
- Amstrad Tower of Power
- Posts: 12273
- Joined: Tue May 22, 2007 4:36 pm
- Location: NW Kent, Darn Sarf innit.
#10 Re: Electronic filter.
I had to Google 'RAD Hard'!
Respekt!
Respekt!
"The fat bourgeois and his doppelganger"
- Mike H
- Amstrad Tower of Power
- Posts: 20157
- Joined: Sat Oct 04, 2008 5:38 pm
- Location: The Fens
- Contact:
#11 Re: Electronic filter.
Wow ..
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."