bar graph driver

bar graph driver Philips have recently introduced a new integrated circuit which has been control liquid crystal di plays. The read-out is in the form of a bar graph, in other words, a number of IC is that it strips. The attraction of this new provides a number of different functions. Any single strip, between 9 and 18 in number, can be selected individually. However, it can also be used to provide e scale display. Moreover, in this a "thermometer" typ instance it is also possible to indicate the maximum reading. This can be reset either manually, or automatically after an interval of two seconds (see are derived directly from the supply voltage, the latter should be reasonably stable and can lie anywhere between 5 ... 15 volts. The input buffer opamp may not always be required. For example, when measuring temperature value, the opamp can be omitted and replaced by a 10 kg, resistor between pin 25 of the IC and ground, and a 10 kg, NTC (negative temperature coefficient resistor) b...