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| Author | Message / Information |
| Huron Quote | Reply | | Newby transistor radio building questions posted on: 10/27/2003 9:05:12 PM I am hoping to build a simple 2-3 transistor radio. The schematic I was looking at called for 2N2222 transistors. How can I tell which lead is which? I need to find the Base, Collector, Emitter. The schematic calls for several capacitors and uses "pF", "nF", and "uF". At the store the capacitors are stamped "pF" or just have a number on them. How do I buy the right capacitors? Do I really need "inductors"? I get the impression I have to buy some ferrite rod and do some winding with magnet wire. How do I calculate and build an inductor with 220uHy, 5.6uHy, or 2.2uH? I'm having a tought time finding ferrite. Can I just use a cardboard tube with some windings? Maybe I need to find a simpler radio to build. Anyone have a simple clear schematic that they would like to recommend? Thanks! Huron |
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HempHacker
Quote | Reply | This message was updated on 10/29/2003 9:37:16 AM by HempHacker |
Newby transistor radio building questions
replied on: 10/29/2003 9:33:12 AM Looking at the transistor with the round side up and the legs away from you, the pins from left to right are: emitter, base, collector. When trying to find out what leads are what on electronics, search the web for the part name and 'pinout' or 'data sheet'. Many manufacturers make some of the same chips, like the 2N2222, but if they have the same number, then they should all have the same 'pinout'. A manufacturer's website about the 2N2222. Usually there will be a data sheet and it's usually an Adobe PDF. That's where the 'pinout' will be About the capacitors: the 'p', 'n', and 'u' are the same as a 'k' in km for kilometer. Except k=1000, p=.000000000001, n=.000000001, and u=.000001 So a 100nF is the same as a .1uF, and this can be confusing to some people at times. Yes you need inductors. But you'd want to buy them though, because you're going to need to adjust them to get them to tune in properly. When you tune them, you need to use a plastic screw driver (You should be able to find these near where you get your inductors). This is because a metal one will change the tuning. Last of all, don't let any of this discourage you. If this sounds too complicated, RadioShack and other electronics stores (the kind that sell resistors and capacitors) sell radio kits that have all the right parts and instructions on how to build. I've built a few of those myself for classes I've taken. Have fun and let us know how everything turns out! |
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weirdvideos
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Newby transistor radio building questions
replied on: 7/18/2004 6:46:08 PM Don't feel bad or feel stupid... I built 3 and they don't work.... I collect schematics off internet webs sites; buy transistors from supply houses and am still trying. try these folks for Trans... http://www.4starelectronics.com/part_search.html MY SITE: www.wadictatv.com for antique TV parts. |
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vroomvroom
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Newby transistor radio building questions
replied on: 8/23/2004 8:45:15 PM click on this link to get a FREE 20 gig ipod. http://www.freeiPods.com/default.aspx?referer=7769135 It really works! check it out here http://www.wired.com/news/mac/0,2125,64614,00.html?tw=wn_2culthead |
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datasheet
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Free DataSheet Site.
replied on: 9/4/2005 9:12:15 PM http://www.datasheet.in http://www.datasheet.in Special IC DataSheet Site. :lol: |
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andrewjacab
Quote | Reply | This message was updated on 2/17/2008 9:24:47 PM by andrewjacab |
Free DataSheet Site.
replied on: 2/16/2008 12:54:58 AM DSP Innovations has recently launched a FREE data sheet search site. The site, http://www.datasheetpro.com , enables component and design engineers to easily find electronic and semiconductor datasheets necessary for their projects. Please try out the service and provide your feedback to support -at- datasheetpro [dot] com. Additionally, the site will allow manufacturers to upload their newest datasheets and cross references for search. Please see www.datasheetpro.com/services.php for details. |
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