Sunday, April 13, 2008

CV6149's Cmoy Headphone Amp

Since the 1st day I did my Cmoy with ur instruction.
I have build 3 set..each time experimenting with different idea hehehe..
and YOU sir...have poison me and my friend into diy electronic.Thank you! hahahha
anyway below is the description and picture of my built for my desktop as preamp (good idea??? i dont care..sound wonderful!)
1000uf 16v Rubycon ZL bypass with 0.1uf polyester cap
0.47uf Evox Rifa polypropelene caps
TLE2426 VG
Gain 5
OPA2228 running at 15v
Wall wart 20v to LM7815 with 3300uf Elna at input and United Chemicon 220uf output bypass with 0.1uf ceramic
The sound??? after change to opa2228.....unbelievable!! good detail,good bass,very good sound stage. Tested quite some opamp already.
Btw I'm no audiophile nor high budget just a audio fan out there.

Best Regards,
Country: Malaysia

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Sunday, March 23, 2008

Most Simply DIY Instruction on Cmoy Headphone Amplifier.

Most simply DIY instruction on Cmoy Headphone Amplifier

As you can see the layout shown above, Please print it out by click on it to enlarge and save to print.

Component Part List;

2 x 4.7k ohms 1/4w (R1)
2 x 100k ohms 1/4w (R2)
2 x 1k ohms 1/4w (R3)
2 x 10k ohms 1/4w (R4)
2 x 100 ohms 1/4w (R5)

2 x 220 uf 25v (C1)
2 x 0.1 uf (C2)

Transistor IC:
1 x OPA 2227

1 x 10 k Dual Pot (Volume Control)
1 x On/Off Switch
2 x 9V Battery Cell

I have plot out the 3 area where we got to focus 1 at a time. They are Right channel component, Left channel component and power supply component. You may pick any area to start with but never jump to another area until you have fully completed that area. For e.g I start with Right Channel component area then Left Channel component area and lastly the Power supply area. The reason why I told you to do so is when you complete each area it become 1 whole component just like an IC Chips and it will certainly look much easier to build and less mistake.

Your next question might be, "hey where to I place all this resistor and capacitor?"
Ans: There are a few way to do it;

1) Use a wooded board to be the base and lay each component to look like above layout and use some wire to link up the connection.

2) If you have a good soldering skill, then you may use a PCB board to solder the connection on the reverse side of the PCB board.

3) Use your creative to hook up everything.

I would suggest way number 1, reason is the purpose of this project is the get the music out to headphone and to your ear, not messy stuff that you can't enjoy the music at all.

Alright I leave the rest to you to build, if there is anything you wanna ask me can leave me a comment and i will try to answer you.
Good Luck and wish you success!

William Neo

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Tuesday, March 11, 2008

DIY a $20 Dollars Hi-End Heaphone Amp

DIY Gwado RA1 Headphone Amplifier

Some people like you and me who can't afford to pay high price for this "state-of-the-art performance" Grado RA1 Headphone Amplifier, so what we can do is self DIY it, althought it might not be equal sound quality compare to the Grado RA1, but is up to you to tweaks it by changing the component like capacitor and resistor or even use a higher grade soldering lead, so at the end of the day, is still your own judging of the sound quality has gone worst or better then Grado RA1.

The DIY Instruction layout;

Gwado Ra1 Headphone Amplifier

Hopefully so far you can understand the layout as shown above, next we will need to purchase the part list.

Part list;

2 x 100K Ohm 1/2W $0.49 Parts Express Code: 002-100K
2 x 120k Ohms 1/2w $0.49 Parts Express Code: 002-120k
2 x 470k Ohms 1/2w $0.49 Parts Express Code: 002-470k
2 x 4.7k Ohms 1/2w $0.49 Parts Express Code: 002-4.7k

2 x Dayton 4.7uF 250V Polypropylene Capacitor $2.79 EA- Parts Express Code: 027-422
2 x Dayton .10uF 250V Polypropylene Capacitor $0.67 EA- Parts Express Code: 027-400
2 x 330uF 35V Radial Electrolytic Capacitor $0.27 EA- Parts Express Code: 020-1164

1 x NJM 4556 $0.40 EA Mouser Part Number: 513-NJM#4556AL

Other Parts:
1 x 100k Dual Volume Pot
On/Off Switch
2 x 9Volt Battery Cell

Optional Upgrade of the PSU to a Virtual Ground with an TLE 2426 (3pin) IC

Optional Upgrade Parts
1 x TLE 2426 IC
1 x 220uf 25v Capacitors

Alright that's all, the rest shall leave it to you to complete it
Wish you all the best!

William Neo

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Amazon is selling Grado RA1@ $425USD.

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Thursday, March 6, 2008

Class A Mosfet Headphone Amplifier

DIY on Class A Mosfet Headphone Amplifier

In the past, I have always wanted to build a Hi-fi amplifier especially the Son Of Zen by pass lab, the problem I didn't start building, it was because the transformer were to0 expensive for my budget and it is difficult for me to purchase the high power resistor and at my local radio shack, and so the idea was drop or maybe wait till I earn enough from adsense. :)

Recently I came across this Mosfet Class A Headphone amp schematic by Greg J. Szekeres, so I have this intention to read the diagram and draft out the layout of all the component first before I start building it. Let start with the component that I required.

List of Component:

Capacitor Line Up;

1) 2 x 1uf, 35V
2) 2 x 0.1uF, 35V
3) 2 x 470uF, 35V Electrolytic

Resistor Line Up;
1) 2 x 4.7k ohm 1/4w
2) 2 x 100k ohm 1/4w
3) 2 x 220k ohm 1/4w
4) 2 x 1k ohm 1/4w
5) 2 x 220 ohm 1/4w
6) 2 x 20 ohm 5w

Diode Line Up;
1) 4 x 1N914 Diode

Mosfet Chip Line Up;
1) 2 x IRF 513 Mosfet

Optional Item;
1) 10K - 100K Dual Pot

Alright so far the component isn't that much and also it look easy to obtained these stuff. (Thinking of getting all the high grade stuff since not many of them).

Ok let's look at Greg J. Szekeres original schematic;

For more reference and detail please visit his article here.

After reading his schematic, am now going to put all the component into the picture which will look like this;

As above picture shown, this is how I am going to lay all the component by Hot Soldering it.
Ok now, there is one optional item wasn't in the picture which is the audio pot, if you want to add your audio pot, simple connect it before the "Right In" and "Left In" together with any point of the "GND" will do the job.

Last but not least, I will need a regulated 9v-15v power supply which will connect to the (+) and (-) as shown on the layout diagram.

For full detail of the sound quality and description of this Mosfet Class A Headphone amp please visit Greg J. Szekeres Article at

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Friday, January 4, 2008

Cmoy Amplifier

DIY Simple Headphone Amp Tutorial
By Cmoy Design (Mini Pocket Amp)

Cmoy amplifier is currently the most popular headphone amplifier for beginner to DIY. It only use a 9v battery to drive this headphone amplifier, and it sound excellent! The complete headphone amplifier it self is very small, you could pack the circuit board & battery into a candy tint which is portable to carry around with your ipod or any portable mp3 player. To diy this cmoy headphone amplifier is extremely easy and simple, it only take less then a day to complete.
A step by step guide to build a headphone amplifier.
It sound wonder with Ipod.

Ok I am not gonna crap here, Let's start straight to the point.

The Tools

The Cmoy Headphone Amplifier Component Parts 1

The Cmoy Headphone Amplifier Component Parts 2

A Picture say a thousand words, As stated very clearly that what are the component needed for this Cmoy amplifier. Print and bring this out with you when you go to the radio shack to get this component.

Assembly The Cmoy Headphone Amplifier

Step 1
Get ready your PCB Board.

Step 2
Mark out the center ground.

Step 3
Solder the battery clip wire on to the PCB board as shown above.

Step 4

Solder the Power Led onto the board as shown above.
Add R6 Resistor 10k Ohm as shown above.

Step 5
As you can see on the picture above, the green line indicate that we have to solder and connect hole 4 to 5 to 6. On the other side we have to solder hole 9 to 10 to 11.
*NOTE: How to solder the green line?
There is 2 type of joining the green line, for beginner I will suggest you to use type "A".
Type "B" need more stable hand but less of trouble to cut the left over wire from resistor or capacitor.

Once you have done up to step 5, you should test your circuit by connect it to a 9v battery and toggle on the switch, the led should be light you by now. If you can't get the led to work, please go back to STEP 4, Reverse your Power Led connection and test again.

This is what you should have by now

Step 6

Mount the (R1) 4.7k Ohm 1/4 w Resistor onto the board.
Solder the green line shown above.

Step 7
Mount (C1) 220uF 16v Capacitor.
Solder the green line as shown above.

Step 8

Mount R2 Resistor.
Solder green as shown.

Step 9

Mount 8-Pin IC Socket.
Solder green line as shown.

Step 10
Mount R3 Resistor.
Solder green line as shown.

Up till now you show have something look like this.

Step 11
Mount C2 Capacitor.
Solder green line as shown.

Step 12
Mount R4 Resistor.
Solder green line as shown.

Step 13

Mount R5 Resistor.
Solder green line as shown.

Step 14
Now we have 2 wire connect from the capacitor to the IC Socket.

Step 15
Slot the IC Chip into the socket. Compatible Chip are as follow:
Blurr Brown IC: OPA2227
Blurr Brown IC: OPA2132P
Blurr Brown IC: OPA2132PA
Blurr Brown IC: OPA2134PA
We are almost done...

Step 16

Just follow the wiring connection.

Step 17 (Final Step)
Box it up! And that's your New Toys
Congrate you made it!

P.S do not send me anymore email on asking me to sell you an pocket amp, but alternative you can visit Boostaroo, this site offer a range of pocket amplifier from $29.99 to $49.99.


A really cool Grado RA1 Headphone amplifier at Amazon for $425.

Extend Cmoy with Virtual Gnd Instruction
On TLE 2426
This is how it should be, 1 x 22ouf Caps and 1 x TLE 2426 instead of 2 x caps and 2 x resistor.

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