Guest Kasamiko Posted July 15, 2004 Report Share Posted July 15, 2004 Hi,I need a cross or any suitable replacement for diode 1SS82.Br.. :DRhonn ;) ;)1SS82.pdf Quote Link to comment Share on other sites More sharing options...
ante Posted July 15, 2004 Report Share Posted July 15, 2004 Rhonn,It Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted July 15, 2004 Report Share Posted July 15, 2004 here is what I found so far.1SS82 = EMX-300http://www.rangeraudio.com/stock1.htm Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 15, 2004 Report Share Posted July 15, 2004 Rhonn,It Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted July 16, 2004 Report Share Posted July 16, 2004 1SS82 = Manufacturer Part No. 1SS82 NTE Part No. NTE552 http://www.nteinc.com/specs/500to599/pdf/nte552.pdf ECG522=1S1834 1N4937 1SS82 = sk90001N4933 GI ECG552 SK9000 50PIV, 1a Fast Sw. Si Diode1N4936 GI NTE552 SK9000 400PIV, 1a Fast Sw. Si Diodehttp://www.geocities.com/rxtxtubes/pa00036.htmEMX-300103-131 113397 139706 1N4305 1N916 1S1555 1S1585 1S1588 1S2076 1S2473 1S276A 1SS133 1SS53 1SS54 1SS84 MA150 MA170 MA171 1N4548 1N456A 1N914 ECG177 1N4450 1N4148 http://matthieu.benoit.free.fr/cross/1n_.htmhttp://www.rangeraudio.com/stock1.htm Quote Link to comment Share on other sites More sharing options...
ante Posted July 16, 2004 Report Share Posted July 16, 2004 The 1N4148 is rated 75/100 Volts and the 1SS82 is rated 250/300 Volts?Ante ::) Quote Link to comment Share on other sites More sharing options...
GPG Posted July 16, 2004 Report Share Posted July 16, 2004 What is this diode's function Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 16, 2004 Report Share Posted July 16, 2004 What is this diode's functionHere take a look. ;)@HotwaterWizardThanks a lot John..@AnteI was confused too. ::) Quote Link to comment Share on other sites More sharing options...
MP Posted July 17, 2004 Report Share Posted July 17, 2004 The diode/capacitor set make up a VARACTOR, or varicap. Although these used to be made up from the individual parts, you can purchase them in a single package today. A varactor is a diode that behaves like a variable capacitor, with the PN junction functioning like the dielectric and plates of a common capacitor. I have attached a diagram of the symbol used for this device.MP Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 17, 2004 Report Share Posted July 17, 2004 I replaced it with 1S2471 and it's working well. :D@MPVARICAP Diode mostly used in RF circuit for tuning..I'm not aware which part you refer.Rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
GPG Posted July 17, 2004 Report Share Posted July 17, 2004 The diode is protecting the auto black level sense transistor. Any low current high speed diode rated at ~200V will do. Quote Link to comment Share on other sites More sharing options...
MP Posted July 17, 2004 Report Share Posted July 17, 2004 Rhonn, the diode is not quite as critical in this setup as the capacitor. The diode function is secondary. Capacitor value is critical, though. This setup is used in conjunction with all of your PNP transistors.Since you asked: ;) When a reverse voltage is applied to a PN junction , the holes in the p-region are attracted to the anode terminal and electrons in the n-region are attracted to the cathode terminal creating a region where there is little current. This region, the depletion region, is essentially devoid of carriers and behaves as the dielectric of a capacitor. The depletion region increases as reverse voltage across it increases; and since capacitance varies inversely as dielectic thickness, the junction capacitance will decrease as the voltage across the PN junction increases. So by varying the reverse voltage across a PN junction the junction capacitance can be varied. (typically, the depletion region width is proportional to the square root of the applied voltage, and capacitance is inversely proportional to the depletion region width. This causes the capacitance to be inversely proportional to the square root of applied voltage.) This nonlinearity allows the varactor to be used also as a harmonic generator. A voltage controlled capacitance is useful for tuning applications.MP Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted July 18, 2004 Report Share Posted July 18, 2004 MP thanks for that very informative reply.. ;)@GPGI think 1S2471 will do it.. Quote Link to comment Share on other sites More sharing options...
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