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Old 2nd April 2012, 06:29 PM   #11
diyAudio Member
Join Date: May 2008
A dual mono headphone amp? So you have a headphone with separate connectors for each ear? Or is it going to be a mono amp for two listeners?

Whatever it is, build the original circuit first. Use all components with their original values. Don't skip the k in the resistor values. Don't add capacitors arbitrarily. Follow the instructions on the CMoy website.

When the original circuit is up and running you can think about tweaking it.

Hint 1 on the power supply question: Your schematic contains two batteries which supply 18 V. The amp will draw the current it needs on its own. No need to worry about the mA.

Hint 2: S2 is a switch. If you connect it the way it is drawn on your schematic, your amp will never work. If you connect it right however, the amp will get 18 V from the batteries.

When you got it working on batteries, investigate how to build a mains-fed power supply. HeadWize - Project: Designing an Opamp Headphone Amplifier (A HeadWize Design Series Paper) is a good source on the topic. Be aware that at some point during that process you will be working with mains voltage and that can be dangerous.
If you've always done it like that, then it's probably wrong. (Henry Ford)
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Old 2nd April 2012, 06:37 PM   #12
diyAudio Member
Join Date: Oct 2008
Tanks for your help.
I want to be able to hook up my balanced headphones up to it. The goal is to build simply a dual CMoy.
I'll order parts to build a single CMoy then adjust it as needed to do dual mono. I wanted to start with OpAmps then move on to building a Class A amp.

Thanks for the link. How do you read a datasheet for a OpAmp to understand what it needs? I somewhat understand the power portion of it but i'm confused where the audio comes in. I don't really understand how to figure out what resistors and capacitors are needed for that portion. As well as going out from the opamp to the headphones.
If you could just give me what those two portions are called my google searching abilities will be able to take over from there

Thanks again,
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Old 3rd April 2012, 09:17 AM   #13
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
read PASS, ESP, Decibel Dungeon and JUNG when you need more detail.

Yes, I included PASS as the first. He shows some very simple explanations of how one and two semiconductor circuits work.
One needs that basic understanding to move on to using opamps.
regards Andrew T.
Sent from my desktop computer using a keyboard

Last edited by AndrewT; 3rd April 2012 at 09:20 AM.
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Old 3rd April 2012, 05:55 PM   #14
diyAudio Member
Join Date: May 2008
Balanced headphones, that sounds expensive.

The HeadWize link contains the information you are looking for. Scroll down to the section titled 'Configuring Opams for Voltage Gain' and read the entire section.

Read Andrew's recommended reading before you start the class A amp.
If you've always done it like that, then it's probably wrong. (Henry Ford)
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