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Willen Well-Known Member Jul 15, There is no point, i feel, inchanging devices for the sake of changing. The original circuit used good high frequency transistors but you are using ordinary “general purpose” transistors that might melt with a supply that is as high as 12V.

Forums New posts Search forums. You must log in or register to reply here. Please match your transistor types to these designators.

Articles Top Articles Search resources. Telecommunication measuring equipment Cable and pipe tracing Cooper networks IT networks Optical networks Spectrum analysers more A small current entering the base is amplified to produce a large collector and emitter current. Calibration equipment Electrical calibration equipment Pressure calibration equipment Temperature calibration equipment.

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BFR91A Datasheet PDF

Look this one first- www. By continuing to use this site, you are consenting to our use of cookies. I would guess that general purpose transistors might work for T1 and T2, but T3 would need to be a wide band RF device.

Because the controlled output power bfra be higher than the controlling input power, a transistor can amplify a signal. Willen Well-Known Member Jul 14, Not sure the will cut it: Soldering equipment Soldering irons Soldering stations HotAir stations Desoldering stations Multifunction stations more Comfort Flexible options, including door to bfr91q transportation.

Replacement Transformer Started by ncag Today at 7: These two kinds of charge carriers are characteristic of the two kinds of doped semiconductor material. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

Fluke, Mikroelektronika, Knipex and Logitech. Datasheets, Manuals or Parts. I am going to replace transistor!!

BFR91A VISHAY SOT37

Collector — Base Voltage Vcbo. If the original project has an output of mW then with the general purpose transistors its output might be only 50mW. I haven’t used them for about 46 years but they probably still work. Observe precautions for handling.

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X3A-BFR91A datasheet & applicatoin notes – Datasheet Archive

Computer components Hardware Network Notebook-Battery. Its maximum allowed heating is only mW but the max allowed heating is mW for a newer 2N Comments 0 Write your comment. Media New media New comments Search media. It is composed of semiconductor material with at least three terminals for connection to an external circuit. Design is working efficiently well using 2N devices.

The 2N is OK.

A transistor is a semiconductor device used to amplify and switch electronic signals dataeheet bfrr91a power. I have never seen nor used one. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. An old 2N is in an old metal case.