Cyclone Analogic Bass Bot Manual do Utilizador descarregar pdf (Página 9)

or as little as 3.7 volts, they will still be able to power the original memory chips or the 32 Bank Memory

system, for many years.

Option A's problem 2 (the lithium battery needing significant technician effort to replace) is solved by the

optional lithium battery being a coin-cell, which clips into a holder which is loosely but securely mounted

inside the machine, just to the right of the battery compartment. Instructions on inserting and replacing this

battery follow.

These coin-cell (also know as button-cell) batteries have a capacity of about 230 milliamp hours, which is

about a quarter of that of the 1/2 AA batteries mentioned in Section 2. If not for self-discharge, these

batteries would last for decades too. Their self-discharge rate at room temperature (ca. 20°C) is also

specified at below 1% per annum. However, coin-cells have a smaller amount of electrolyte than the

cylindrical cell, a larger gasket, and possibly not such a good seal in this gasket. So it my impression that

coin-cells are at greater risk of failing due to evaporation or leakage of the electrolyte than the cylindrical

cells.

Option A's problem 3 is solved by us shipping the machine without any lithium battery installed.

We do not want to ship machines with C-cell batteries. This adds to the weight, which affects shipping costs

and might cause additional damage if the package is dropped. (One TB-303 which arrived from overseas

with C-cell batteries presented a puzzle when it did not run from these batteries, even though each one was

measured as having a healthy 1.5 volts. The package had been dropped in such a way that the batteries'

inertia impacted them so hard that the batteries became shorter – in total shorter than the distance between

the battery contacts.)

It is generally not essential that memory contents be retained while we ship the machine to its owner, since

only in rare instances does the machine have the original memory chips with user's patterns of value

remaining. However, we would prefer that at least our test patterns are retained.

For this reason, and for general convenience with the marginally higher memory current requirements of the

32 Bank Memory system, we install a large capacitor across VRAM. The value is 6800uF, which is 68

times that of the original capacitor. For a 2 volt drop (from about 5 to 3 or so, which is enough to retain

memory contents) this capacitor can supply 13.6 milliamp seconds.

Depending on the temperature and self-discharge rate of the capacitor, this may retain the memory contents

for months with the original memory chips, 5 days or so for the 32 Bank Memory system at 20°C (0.03

microamps = 45,333 seconds) or for 7 hours at 40°C (assuming 0.5 microamps).

Installing and changing the 2032 coin-cell lithium battery

These instructions are for people who are handy with a screwdriver and prepared to take responsibility for

opening their electronic musical instrument, with the consequent risk of damage due to static electricity or

other causes. Alternatively, please take the machine to an electronic technician who already knows about

these things.

1 - Choose a good battery. There are numerous companies making these 2032

lithium batteries. All these batteries should work, but I suggest using a Panasonic

or Varta battery, since these are very well established companies.

These are non-rechargeable batteries. Many of these batteries use lithium

manganese dioxide chemistry. These should be fine, but Panasonic assert that

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Cyclone Analogic Bass Bot Manual do Utilizador Página 9