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cMoyBB v2.03 Questions

post #1 of 13
Thread Starter 

Plan on ordering a cMoyBB, got a few questions first.

 

1. 9v vs 18v, Which would be sufficient/better to drive 32 ohm headphones (HFI 580)?

2. Does the 18v have a longer life than the 9v?

3. Would it be better to get the rechargable version or the regular version and use my own rechargable batteries?

4. If I wanted to replace the opamp with something more bassier, would the Analog Devices AD8066ARZ be the best option?

post #2 of 13
Quote:
Originally Posted by markelg View Post
Plan on ordering a cMoyBB, got a few questions first.

1. 9v vs 18v, Which would be sufficient/better to drive 32 ohm headphones (HFI 580)?

2. Does the 18v have a longer life than the 9v?

3. Would it be better to get the rechargeable version or the regular version and use my own rechargable batteries?

4. If I wanted to replace the op-amp with something more bassier, would the Analog Devices AD8066ARZ be the best option?

I've been looking at getting the cMoy BB myself, just for the fun of it.

My two cents.

Just get the 18v version, more juice, should last longer between battery swap.

Get the regular version and buy a least 4 rechargeable batteries with recharger, the quality of the built in rechargeable battery is an unknown on how many times it can be recharged anyway.

Swap the op-amp to improve the quality of the sound? replace it and find out.
 

 

 

post #3 of 13
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post

I've been looking at getting the cMoy BB myself, just for the fun of it.

My two cents.

Just get the 18v version, more juice, should last longer between battery swap.

Get the regular version and buy a least 4 rechargeable batteries with recharger, the quality of the built in rechargeable battery is an unknown on how many times it can be recharged anyway.

Swap the op-amp to improve the quality of the sound? replace it and find out.
 

 

 


Do the op amps have to be soldered?

 

post #4 of 13
Quote:
Originally Posted by markelg View Post
Do the op amps have to be soldered?

I'm far from an expert on cmoys and op-amps, so I have to guess.

DIP-8 op-amps are socketed (removeable)

SOIC op-amps are soldered to the PCB or soldered to a SOIC to DIP-8 adapter.

Some op-amps are single channel, some are dual channel.

If you have a dual channel socket, sometimes you have to solder two (SOIC) single channel op-amps to a SOIC to DIP-8 adapter.

I'm going to "assume" cmoys use one dual channel op-amp (DIP-8).

You can not just swap and install any op-amp in any socket.

Check and see what others have tried and what works.

There are some dedicated threads to cMoys and some dedicated to op-amps on Head-Fi.

Hope this helps.
 

 

 


Edited by PurpleAngel - 2/20/12 at 5:31pm
post #5 of 13
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post

I'm far from an expert on cmoys and op-amps, so I have to guess.

DIP-8 op-amps are socketed (removeable)

SOIC op-amps are soldered to the PCB or soldered to a SOIC to DIP-8 adapter.

Some op-amps are single channel, so are dual channel.

If you have a dual channel socket, sometimes you have to solder two (SOIC) single channel op-amps to a SOIC to DIP-8 adapter.

I'm going to "assume" cmoys use one dual channel op-amp (DIP-8).

You can not just swap and install any op-amp in any socket.

Check and see what others have tried and what works.

There are some dedicated threads to cMoys and some dedicated to op-amps on Head-Fi.

Hope this helps.
 

 

 




Sweet thanks, got it figured out, literally just ordered my cMoy, I'll probably order 8066 later, it is a DIP 8 So you can just drop it in apparently, according to what the site says. "Presoldered BrownDog DIP8 Adapter, Easy drop-in replacement." Do you know what a "rail to rail output" is? and since I ordered the 18v version, does the op amp I get matter, for example, I heard some op's are 9vm some are 18v, if I get a 9v one, will 18v be too much?

 

post #6 of 13
Quote:
Originally Posted by markelg View Post
Sweet thanks, got it figured out, literally just ordered my cMoy, I'll probably order 8066 later, it is a DIP 8 So you can just drop it in apparently, according to what the site says. "Presoldered BrownDog DIP8 Adapter, Easy drop-in replacement." Do you know what a "rail to rail output" is? and since I ordered the 18v version, does the op amp I get matter, for example, I heard some op's are 9vm some are 18v, if I get a 9v one, will 18v be too much?

"rail to rail output", that's over my head, might have something to do with a power rail, something that transfer the electricity around?

18v verses 9v, I have no idea, but i'm assuming the 18v cmoys are a newer version (revision?) of the 9v cmoys.

Just have to talk to other users and see what they have tried.
 

 

 

post #7 of 13
Quote:
Originally Posted by markelg View Post

Plan on ordering a cMoyBB, got a few questions first.

1. 9v vs 18v, Which would be sufficient/better to drive 32 ohm headphones (HFI 580)?
2. Does the 18v have a longer life than the 9v?
3. Would it be better to get the rechargable version or the regular version and use my own rechargable batteries?
4. If I wanted to replace the opamp with something more bassier, would the Analog Devices AD8066ARZbe the best option?

1. Both should suffce. It depends on the opamp you use. If you are using AD8620, 18V is pretty much a must as 9V is not enough voltage to drive the opamp properly.
2. Not necessary, but likely.
3. Rechargeable save money in the long run, but it won't sound as good as regular battery as regular battery has higher current output. Get the rechargeable version as you can still use regular battery in it.
4. You have the bass boost switch, use that instead of worrying about opamp. AD8066 is generally a bighter, more detail sounding opamp than the stock OPA2227. It doesn't give more bass. If you want an overall better sounding opamp, get the AD8620 + 18V option instead, but you can't get the rechargeable version for it. Not sure about this, actually.
Quote:
Originally Posted by markelg View Post

... Do you know what a "rail to rail output" is? and since I ordered the 18v version, does the op amp I get matter, for example, I heard some op's are 9vm some are 18v, if I get a 9v one, will 18v be too much?
Rail to rail means the signal in the opamp swings from one power rail to the other. In the case of 18V (split into +9V and -9V), the signal goes in theory, from +9V to -9V, given you the best swing possible. If it is no rail-to-rail, depends on the opamp, it might only swing from +7.5V to -7.5V, or +6V to -6V, well, you get the idea.

Yes, opamp matters.OPA2227 and AD8066 can work with both 9V and18V (the later should sound better), but AD8620 must be 18V.
Edited by ClieOS - 2/21/12 at 3:33am
post #8 of 13


 

Quote:
Originally Posted by PurpleAngel View Post

I've been looking at getting the cMoy BB myself, just for the fun of it.

My two cents.

Just get the 18v version, more juice, should last longer between battery swap.

Get the regular version and buy a least 4 rechargeable batteries with recharger, the quality of the built in rechargeable battery is an unknown on how many times it can be recharged anyway.

Swap the op-amp to improve the quality of the sound? replace it and find out.
 

 

 


Where do you order the 18v version? I'm looking on the JDS lab site and only see the 9v in the options. *****nvm just found it****

Also just because I'm not the brightest at circuit boards and such. Can you still use a 9v battery in the 18v version? Still confused on this one. 

 


Edited by AppleDappleman - 2/21/12 at 3:04am
post #9 of 13

If you order the 18v version it will come with two 9v batteries already hooked up and yes you will need to use both.

post #10 of 13
Quote:
Originally Posted by markelg View Post
Plan on ordering a cMoyBB, got a few questions first.

1. 9v vs 18v, Which would be sufficient/better to drive 32 ohm headphones (HFI 580)?

2. Does the 18v have a longer life than the 9v?

3. Would it be better to get the rechargable version or the regular version and use my own rechargable batteries?

4. If I wanted to replace the opamp with something more bassier, would the Analog Devices AD8066ARZ be the best option?


Been reading up, looks like the two battery 18v versions are for helping to driving high impedance headphones.

 

 

post #11 of 13

Any idea why suddenly my JDS Cmo BBy started to play mono with reverb? Is it possible due to overcharge?

post #12 of 13
Quote:
Originally Posted by Synthax View Post

Any idea why suddenly my JDS Cmo BBy started to play mono with reverb? Is it possible due to overcharge?


i think the opposite is more likely, try changing batteries and see what happens

post #13 of 13

All has been cleared. The ground wire was broken/desoldered in rca plug. Ufff.

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