Join Date: Apr 2002
Location: Boerne, TX, USA
Re: Boosting a Boostaroo for a Zumo
OK, here's what I did. You should probably get a tech to do this if you have no experience with surface mount electronic soldering. Or get the 14-year old geek kid next door to help
Remove battery cover and batteries. Locate three black integrated circuit chips left of center (with switch up, wire left orientation). Look at first picture (sorry about the focus but it conveys what you need). Dremel plastic away from left and right side of uppermost IC exposing the tiny chip resistors either side of the IC. Be careful not to damage the components! The 2nd resistor down on the left and the third resistor down on the right are marked "113" (11,000 Ohms). Remove these two only. Clean the exposed pads with Solder-Wick(TM). Replace with a higher value resistor between 22,000 and 27,000 Ohms (I used 24,900 because I had some). This will increase the channel gain to about 5.
The resistors are size 0603 (.06" by .03"). You can get them from Digi-Key, Allied, Newark, etc. Use a small-tip iron and small diameter solder. Do not apply too much solder. When done, cover openings with a piece of packaging tape cut to fit. Replace batteries and battery cover.
Referring to picture 2, the right most jack will be the channel with the higher volume.
Chain-driven '08 Blazing Orange Triumph Tiger 1050i
Last edited by davemoore; Dec 30th, 2008 at 3:38 pm.