some people aren't going to agree with me here, but if you put all the tiny differences in sound aside, the amp is there to just make your maximum volume louder. You only need an amp, if the music you want to play does not play loud enough on the source equipment and the output device (mainly...

Yeah, and less fragile which is also more portable. I just don't get why so many people want to put a toggle or a volume control knob on the long side of a mint tin. If only the mint tin was a wee bit wider then it would be a perfect sized enclosure. I usually like to put the following in this...

Do the solder bridges not effect the sound at all? I was under the impression that solder isn't the greatest of conductors.

Whether you need the two 9V batteries depends on the gain you use. I know that the 2227 and the 2132 work fine on one 9V battery. In my build, the only reason why I used two was for the extra run time. One battery yielded me about 9 hours run time. Two yielded 22 hours. Mine is set at around 6 gain.

hmm, I don't know about you guys, but I think the ibuds bass doesn't go deep enough for ones that came from 1G and 5G ipods. The bass slam is there, but there is no follow through on some nice grand piano pieces. Mid's clip pretty easy too and max volume isn't too hard to saturate. The treble is...

Blue LED's above 100mcd are really bright. I had to sand some 80mcd ones down and use a 1M resistor to get it dim enough so that it wasn't so piercing if you happened to look at it at a wrong angle.

Supririsingly, I didn't get any better with slightly better equipment. I tested -31 with X-fi and V6, but no cmoy amp. -36 with X-fi and V6 and cmoy amp. And a recap of -33 with laptop speakers on Inspiron 8600.

I did the test on an Inspiron 8600 (laptop speakers) and got a -33. Personally, after -30 or so I wasn't sure if it was totally right, but before that I was pretty sure. Some of you are going to say BS, but I will also try them with some v6's attached to a cmoy amp and to the X-fi soundcard that...

I always thought that what determines if your an audiophile, stereophile, or music lover is the question you ask the person you just demoed a piece of music. If you ask, "How do you like my equipment?", then your a stereophile. If you ask, "How does the music sound?", then your an...

Quote: Originally Posted by jernmo I just copied and pasted the poll from this thread. HD 650 23 50.00% DT 880 26 56.52% It showed one at 50% and one at 56% Just a larf. You can vote for both of them. I guess this is if you like both of them equally well, or just prefer...

Unfortunately new headunits ruin the asthetics of most cars. I wish they would quit selling some of those outlandishly garish head units and make one that looks stock. Stuff like super glossy black surfaces, semi transparent buttons, multicolored buttons, and markings are just adding to the...

I don't know about the guys advocating FM transmitters, but I would have stuck with using one if the sound quality wasn't that bad. I actually found the tape deck's sound quality better than the FM transmitter. The FM transmitter seemed to have filtered out some of the higher frequencies and...

Something is not right. I believe the resistances should be equal, but probably a better way to check is to power it up and make sure that the voltage from the battery positive to virtual ground and virtual ground to the battery negative side is half and half with the opamp in and connected...

I believe Teerawit is right about the the first picture right cable. It looks like the "virtual" ground and the circuit's actual ground got mixed together. Use your multimeter and probe to see if there is zero resistance from the black negative wire that goes to the battery and the middle 2...

What the dielectric does is allow an induced charge to be built up inside of it. This allows the plates to pack even more of the same charge in a more dense configuration and hence increasing capacitance. A good dielectric (must be an insulator) tries to store as much induced charges as possible...

The 3+ pole version of the socket is useful when you want to disconnect something when you use that plug. Many computer speakers have a headphone jack, when you plug a headphone jack in, the regular speakers turn off automatically because the 5 pole version of the jack will cause an open circuit...

If you want to be paranoid. Make sure you stand on a thickish rubber mat. Don't work in high humidity. Poke around the circuit with one hand only and the rest of your body not touching anything else that is conductive. You might get lucky and not feel anything. Same principle applies here in how...

Some local places that sell gate openers might have that radio part you are looking for, but don't expect the part to be cheap since these devices are low volume. I would guess around $100 for a non code rolling model and the shortest range. Probably a ghetto way would be to scavenge the...

It would be helpful if you could post up pictures before any of us can really help. If you followed the exact build steps, then you should be able to troubleshoot the amp yourself.

The ex71's have good bass extension, but a bit bloated IMO. The mids sound recessed as highs are on the bright side. About the 'earjams' IMO, nothing will improve sound that is not there. The stock earbuds just don't produce any lower frequencies below 40Hz. The mids on them are pretty good...

Also, you might be able to stuff more in a rectangular altoids tin. I was able to fit a volume knob, power adaptor plug and two batteries with a lot of time and creative component placement. Pictures are in one of my other threads.

Just make sure that if you do what ericj says to do that you use batteries that are as similar as possible and in the same state of charge. One battery discharging faster than another will screw things up real quickly. You should get around 7 hours with one NiMH battery. From current draw...

Some stuff to check: Make sure you have adequate solder joints. I made the mistake of shaving down some of the solder points too much that it became loose and caused problems. Check opamp and parts. They should be cool to the touch. None of those components should ever get hot with or...

220uF, I tried some 470uF caps, but it didn't make that much differenct IMO. More differences were heard by changing the OPAMP.

New current values for with OPA 2227 Idle no LED: 6.8mA Idle with LED: 7.1mA Max Value seen: 10mA