DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 14 Dec 2019, 13:34

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Chip Amp Power supply
PostPosted: 24 Jun 2008, 13:32 
Offline

Joined: 23 Jun 2008, 12:40
Posts: 2
Why does the kit for the LM3668TF on chipamp.com require MUR860 rectifiers as opposed to a regular full-wave rectifier ex: http://www.newark.com/65K1695/semicondu ... R-KBU8A-E4 or can I use a well regulated DC powersupply rather than getting an xfmr and rectifiers?


Top
 Profile  
 
PostPosted: 24 Jun 2008, 17:19 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 4052
Location: Arizona, USA
Hi, I'm not sure why someone hasn't jumped in on this one. So even though I seem to be the tube guy around here, I'll answer. I do have one chip amp in my system (it works very well). Not everything in the system glows in the dark.

You can use any kind of rectifiers and supply that suits your desires. What it must do is provide lots of clean current at the right voltages. Typically the MURs are used because they do the job well and are inexpensive. There are many others that will work. Same on the transformers. Toroids are usually used as they are cost effective and available in the sizes needed. If parts are hard for you to get, be creative and substitute what you can get. Don't skimp on the large electrolytics though. They flavor the sound. Use good Low ESR caps. IMHO they are critical and will make or break the sound quality of the amp. OK you other guys jump in if I err anywhere.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
PostPosted: 24 Jun 2008, 17:45 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4580
Location: Winnipeg, CANADA
Failure wrote:
Why does the kit for the LM3668TF on chipamp.com require MUR860 rectifiers as opposed to a regular full-wave rectifier


The MUR860 (or discrete diodes) are not a requirement. There are several examples of gainclones that are built using bridge rectifiers. Mark's baking pan gainclone amplifier is one example.

Here is a picture of another example:
Image
http://diyaudioprojects.com/Gallery/dis ... hp?pos=-26

Cheers

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 29 Jun 2008, 16:10 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
I am always plugging for this guy but here goes again. Buy some regular rectifiers from ApexJr at www.apexjr.com then get your caps there as well. Interconnects are cheap to here and good quality. Does not really matter which rectifier. You need some amp overhead so maybe 10amps or more and the voltage needs to be a few hundred since you will be feeding it 120V already. The caps are 12,000uf at either 50V or 63V, forget but they are 1.99 each by Nichicon from Steve at ApexJr. He has transformers but I think your best be for the proper voltage is ebay and PartsExpress.com. Get about 18V out since it will end up multiplied by 1.4 when rectified. I have a supply built with these parts running a LM3886T and I am very impressed. Sounds great. Limitless power. No bogging down on bass. No noise.
I used this build:
http://picasaweb.google.com/udailey/F5PowerSupplyBuild
Ri

_________________
DIY Lightspeed Passive Attenuator


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy