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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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SMP identification: please help!
Hello,
I'm asking for help with identification of three sm devices. 1. Q1, marked "I GE": probably N-channel JFET _ 2. D2, marked "A 7": diode or BJT used as a diode http://www.bilder-hochladen.net/files/12b4-4w-jpg.html _ 3. Q2, marked "M 5": probably PNP BJT http://www.bilder-hochladen.net/files/12b4-4x-jpg.html BTW, the photos show the PCB of Sony's AN-102 active antenna. Q1 works as RF amp, D2 (and not shown D1) are used for input protection. Q2 is the electronic switch which connects the RF amp stage to the supply voltage. TIA Reinhard |
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