{"product_id":"npn-pnp-transistors-small-signal-high-gain-low-noise","title":"NPN PNP Transistors Small Signal High Gain Low Noise","description":"\u003cp\u003eThis is one item of new, small signal, bipolar silicon transistor as shown in the variations. Where available, the higher pack quantities are cheaper per item. If you would like to mix types in a pack of five or ten, please use the MIX option and send me a list of your requirements from the available types in a site message, or attach a note to the purchaseInteresting Points:\u003c\/p\u003e\n\u003cp\u003eThe 2N4403 is a modern PNP type which happens to have a very low base spreading resistance, making it good for low noise pre-amps as seen in the input stage schematic if you look at \"\u003ca href=\"https:\/\/www.interestingelectronics.com\/old\/henrys_interesting_electronics\/cheap_soundfield\/cheap_soundfield.htm\" title=\"Cheap Ambisonic Soundfield 3D Surround Sound Microphone\"\u003eCheap Ambisonic Microphone and UHJ Encoder\u003c\/a\u003e\" on the Interesting Electronics site, or Douglas Self also uses them for low impedance moving coil record player phono cartridge pre-amps in his interesting book.\u003c\/p\u003e\n\u003cp\u003eSS9012H is a PNP type which is mid-way between a low and medium power device. These are capable of more current than a standard TO92 BC560, for example. They are specifically intended for a 1 Watt class B output stage in small radios and are a better match for that application than an under-powered BC549\/BC550 pair or an over-powered, more difficult to drive TO126 BD139\/BD140.\u003c\/p\u003e\n\u003cp\u003eSS9013H is the NPN complement to the SS9012H.\u003c\/p\u003e\n\u003cp\u003eSS9014H is a standard NPN amplifier \/ driver that you'd generally use to drive the SS9012 \/ SS9013\u003c\/p\u003e\n\u003cp\u003eSS9018H is an NPN VHF amplifier \/ mixer-oscillator that you would find in both the AM and FM RF sections of small radios.\u003cbr\u003e\u003cbr\u003eThe four types shown immediately above are all the transistors that you need to make small radios and are intended for exactly that application. You'll see them extensively in radios from the far East and may appear in schematics as \"S9012,\" or just \"9012.\"\u003c\/p\u003e\n\u003cp\u003eAvailable Types\u003c\/p\u003e\n\u003cp\u003eType No. Manufacturer\u003c\/p\u003e\n\u003cp\u003e2N2222 CDIL\u003cbr\u003e2N2222A generic\u003cbr\u003e2N3702 Central Semiconductor\u003cbr\u003e2N3707 Central Semiconductor\u003cbr\u003e2N3904 generic\u003cbr\u003e2N3906 Fairchild\u003cbr\u003e2N4401G Fairchild\u003cbr\u003e2N4403G Fairchild\u003cbr\u003e2N5210 Fairchild\u003cbr\u003eBC107 CDIL\u003cbr\u003eBC107B CDIL\u003cbr\u003eBC108C CDIL\u003cbr\u003eBC109 generic\u003cbr\u003eBC109C CDIL\u003cbr\u003eBC179 CDIL\u003cbr\u003eBC182L CDIL\u003cbr\u003eBC183L CDIL\u003cbr\u003eBC184L CDIL\u003cbr\u003eBC212L CDIL\u003cbr\u003eBC212B generic\u003cbr\u003eBC214L generic\u003cbr\u003eBC327-40 Fairchild\u003cbr\u003eBC516 Fairchild\u003cbr\u003eBC517 Fairchild\u003cbr\u003eBC547C Fairchild\u003cbr\u003eBC548B generic\u003cbr\u003eBC549C Fairchild\u003cbr\u003eBC550C Fairchild\u003cbr\u003eBC559C Fairchild\u003cbr\u003eBC560C Fairchild\u003cbr\u003eBC636TA Fairchild\u003cbr\u003eSS9012H generic\u003cbr\u003eSS9013H generic\u003cbr\u003eSS9014H generic\u003cbr\u003eSS9018H generic\u003c\/p\u003e","brand":"HJW Electronics","offers":[{"title":"2N2222 \/ 1 Transistor","offer_id":59910160122240,"sku":null,"price":1.8,"currency_code":"GBP","in_stock":true},{"title":"2N2222 \/ 5 Transistors","offer_id":59910160155008,"sku":null,"price":4.8,"currency_code":"GBP","in_stock":true},{"title":"2N2222 \/ 10 Transistors","offer_id":59910160187776,"sku":null,"price":7.8,"currency_code":"GBP","in_stock":true},{"title":"2N2222A \/ 1 Transistor","offer_id":59910160220544,"sku":null,"price":1.8,"currency_code":"GBP","in_stock":true},{"title":"2N2222A \/ 5 Transistors","offer_id":59910160253312,"sku":null,"price":4.8,"currency_code":"GBP","in_stock":true},{"title":"2N2222A \/ 10 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