iBoom: More problems

We previously reported an issue where the iBoom -- a boombox-style stereo adapter for the iPod -- may exhibit electrical problems that could cause battery fluid leakage and other mishaps.

We've since received corroborating reports, as well as some user notes detailing other issues with the device.

One reader writes:

"From the first day I received the iBoom I found it to have two problems:

1. The volume control is faulty - it will not lower the volume in a gradual way but simply switches the volume totally off at the low end of the scale rather than allowing for a lower volume setting.
2. There is an unacceptable amount of hiss coming from the iBoom speakers. This is regardless of which input or the volume control setting - both the tuner or the iPod input show the same problem at any volume control setting.

"I was going to live with these problems but then the third problem arose - now after about 15mins use I get a very bad oscillation or 'motor-boating' (pop-pop-pop) noise from the speakers, regardless of volume or input. When this occurs it makes any listening totally impossible and the problem is permanent until I switch the iBoom off and leave it switched off for 10 minutes or longer, then it reoccurs after approximately 15 minutes of use."

Regarding the original problem, where current passes through to the batteries, causing a potential fire hazard, MacFixIt reader Larry Loeb writes:

"This sounds like a very simple element (a DC blocking diode) has been left out of the circuit. This is a pretty standard technique in electronic equipment of all types. It keeps a charger's voltage from hitting the batteries and causing the problem described.

"If this was left out of the design, there is no real fix except inserting (breaking the connection and soldering one in) your own just before the battery or taking the batteries out of the device."

Feedback? Late-breakers@macfixit.com.

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