shaiqbashir Posted July 11, 2006 Report Share Posted July 11, 2006 HI guys!well! im using the IC CM8870 in a telephonic project. I made some circuit, in which this IC was not working properly, i checked my connections and i found that pin 8 and pin 9 of this IC are shorted internally.I checked its block diagram (given below) and dint find any reason for that. Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted July 16, 2006 Report Share Posted July 16, 2006 I see a resistor of unknown value between those 2 pins. It could be low ohms.Or your meter is reading this.Datasheet https://www.bgmicro.com/pdf/ics8870.pdf Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 16, 2006 Report Share Posted July 16, 2006 The resistance between pins 7 and 8 is about 1M and is used to self-bias the inverter to be a linear amplifier.Shaiq's IC is shorted between pins 8 and 9. Quote Link to comment Share on other sites More sharing options...
shaiqbashir Posted July 16, 2006 Author Report Share Posted July 16, 2006 thanks for ur help!i found that as an abnormality.I purchased a new piece and its working fine.Pin 8 and 9 are not shorted normally! Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted July 21, 2006 Report Share Posted July 21, 2006 Excellent Job finding the problem. Quote Link to comment Share on other sites More sharing options...
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