If I wire two 9v batteries in a series - Do i get 18v?

[aphex]

Sorry for the stupid question, but I be confuddled

 

[TheBDB]

yes

 

[JohnCU]

yesh

 

[RocksteadyDotNet]

If you put them in series.

- + - +

Not

- +
- +

 

[Rubycon]

As long as they are in good health - yes.

 

[aphex]

Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

 

[rudeguy]

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

what's a CMOY?

 

[JohnCU]

Originally posted by: rudeguy

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

what's a CMOY?

and why do this on a saturday night

 

[George P Burdell]

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

Wow just build it already! Best way to learn circuits is to burn a few.

 

[Rubycon]

Originally posted by: rudeguy

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

what's a CMOY?

If you're a head-file it's a compact amplifier for improving earspeaker performance.

If you're kinky, reading the back pages of Hustler magazine it could stand for an electronic version of a penis enlarger - Complicated Metallic Oxide Yanker.

 

[Minjin]

Actually the answer is maybe.

There are several possible ways that you could configure the batteries. Assume a voltmeter is connected across the terminals with positive on left side:

-+-+ -> -18v
-++- -> 0v
+-+- -> 18v
+--+ -> 0v

Note that these are all series configurations. It may seem obvious to most but we shouldn't assume that everyone understands it.

 

[Kenazo]

Just push the + into the - of the other battery and attach your leads to the two terminals that aren't mated together. Instant 18v!

 

[CKent]

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

Nice, I'm probably going to build my first this winter. I'm going to look into using AA (or AAA for smaller size) though, I hear the 9v recharge very slowly. Post pics when you get it together.

 

[Ika]

Originally posted by: CKent

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

Nice, I'm probably going to build my first this winter. I'm going to look into using AA (or AAA for smaller size) though, I hear the 9v recharge very slowly. Post pics when you get it together.

For the usual CMOY opamps, you're gonna need a lot of AA/AAA batteries to get the required voltage. Most of the usual opamps (OPA2227, OPA2132, AD6065) start clipping around 5v; anything under will start sounding worse and worse.

And aphex - if you plan on fitting 2x 9v batteries into an altoids tin... you should probably measure things out first. I think I told you this already, but I thought about doing 2x 9v batteries, until i got all my parts. there was no way in hell i could've fit two 9v batts in this little altoids tin. Lemme go look for pics of my internals.

Found the album:
http://picasaweb.google.com/su...es#4977733548770394130
http://picasaweb.google.com/su...es#4977733590239674386
http://picasaweb.google.com/su...es#4977733608314699794

 

[aphex]

Originally posted by: Aflac

Originally posted by: CKent

Originally posted by: aphex
Thanks! Working on the final layout for my CMOY and was deciding between 1 or 2 9v

Nice, I'm probably going to build my first this winter. I'm going to look into using AA (or AAA for smaller size) though, I hear the 9v recharge very slowly. Post pics when you get it together.

For the usual CMOY opamps, you're gonna need a lot of AA/AAA batteries to get the required voltage. Most of the usual opamps (OPA2227, OPA2132, AD6065) start clipping around 5v; anything under will start sounding worse and worse.

And aphex - if you plan on fitting 2x 9v batteries into an altoids tin... you should probably measure things out first. I think I told you this already, but I thought about doing 2x 9v batteries, until i got all my parts. there was no way in hell i could've fit two 9v batts in this little altoids tin. Lemme go look for pics of my internals.

Found the album:
http://picasaweb.google.com/su...es#4977733548770394130
http://picasaweb.google.com/su...es#4977733590239674386
http://picasaweb.google.com/su...es#4977733608314699794

I'm using a custom cmoy board that someone over at Head-fi designed and had produced by Olimex
http://img225.imageshack.us/my...mage=cmoyv10102cv0.jpg

 

[Rubycon]

9V is rather archaic - use a pair of 4.2V Li-ions in series and you can charge in place with a usb cable. Be sure to observe correct Li-Ion charge/discharge rules strictly, however.

 

[uberman]

Yes. you're just not going to get much amp hour capacity, that's all.