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 09 Jul 2020, 09:41

All times are UTC - 6 hours [ DST ]

Post new topic Reply to topic  [ 1 post ] 
Author Message
PostPosted: 19 Mar 2013, 01:57 

Joined: 28 Dec 2010, 22:07
Posts: 352
Pictures are worth 1000 words, so...




It's a CMoy. The power IC is an OPA2134, the volume control is a generic carbon-track potentiometer and the wiring is all generic-grade. It works perfectly well as a headphone amplifier or a preamplifier due to its +/- 9v supply. Also, it is good for someone who likes to tweak projects such as could replace the signal wire with shielded OFC copper or something else of your choosing.

The case is made of wood. I stained some wooden sticks and put them together into a box. The top and bottom plate are aircraft-grade aluminum and are held to the wood with sheet metal screws that can be fastened by someone with a strong grip. The hardware binding the box to the metal plates are zinc-coated steel and the hardware binding the circuit board and battery clips to the plate are socket-head, stainless steel screws.

The screws in the plates should not be over-tightened; the wood is not extremely hard and you may cross-thread the holes if they are over-tightened. The volume control knob is perfectly accessible between the input and output jack ( I have large fingers and can manipulate it fine ) but it is too close to install a stylish knob, therefore you have the bare pot shaft. Also, the battery life on the amplifier is not that great. With heavy use, I get about 10 hours using cheap carbon-zinc 9v batteries and about three times that with the more expensive alkaline. If you are a modder, you may be able to increase this.

Normally, CMoy amplifiers go for around $30 on eBay in the Altoids' tin. Since this is an enclosure that I made and it looks a little sleeker, I would like to get $45 for it. I like in Washington state (USA) and would primarily like to ship within the lower 48 states. Also, I deal mainly in Paypal. However, if you don't meet the above criteria or you don't like the price, please message me and I will talk with you about it. Maybe we can work something out.


This post has a file attachment. Please login or register to access it. Only Registered Members may view attached files.


You can't have too much heat sink.

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 6 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 2 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
© - Terms of Service - Privacy Policy