From bardian@usadatanet.net Mon Nov 14 09:42:16 2005
Subject:Re: IC's and keyboards

Good question. I'm still playing my original, very early DX7, Ensoniq
Mirage, and Prophet 2000, all of which (as of last time I used them) worked
perfectly.

----- Original Message -----
> Under what circumstances can a keyboard player expect more/less
> playing time before they're trying to get a specific failed IC board,
> or I guess it could be the whole "mother board" from the manufacturer
> of their keyboard? What can you do to extend the life of keyboard IC
> chips, capacitors, ect.. if anything? I'm thinking about Barry's VK7
> problems and my Roland VK and Fantom boards which have some time on
> them - especially at the moment this nice old VK7 I just got and
> really like. At what point in time does the manufacturer say, "Sorry,
> Charley?"
>
> Walter j
>
> *FYI: Integrated Circuit
>
> An integrated circuit (IC), sometimes called a chip or microchip, is
> a semiconductor wafer on which thousands or millions of tiny
> resistors, capacitors, and transistors are fabricated. An IC can
> function as an amplifier, oscillator, timer, counter, computer
> memory, or microprocessor. A particular IC is categorized as either
> linear (analog) or digital, depending on its intended application.
>
> Linear ICs have continuously variable output (theoretically capable
> of attaining an infinite number of states) that depends on the input
> signal level. As the term implies, the output signal level is a
> linear function of the input signal level. Ideally, when the
> instantaneous output is graphed against the instantaneous input, the
> plot appears as a straight line. Linear ICs are used as audio-
> frequency (AF) and radio-frequency (RF) amplifiers. The operational
> amplifier(op amp) is a common device in these applications.
>
> Digital ICs operate at only a few defined levels or states, rather
> than over a continuous range of signal amplitudes. These devices are
> used in computers, computer networks, modems, and frequency counters.
> The fundamental building blocks of digital ICs are logic gates, which
> work with binary data, that is, signals that have only two different
> states, called low (logic 0) and high (logic 1).
>
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