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Old 15th February 2006, 10:42 PM   (permalink)
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Originally Posted by audioguru
At 100MHz, the 2N3904 or 2N2222 only has a gain of about 3. Therefore it needs a pretty big feedback signal to oscillate. The voltage divider of the capacitor or its internal capacitance to ground resistance would give a very low positive feedback signal.
Ground means nothing to the oscillator. It's just a reference point from which to measure voltages. What matters is the impedance between pins 4 and 6. I simulated it, and it even oscillates in the simulation, which has zero ground resistance.
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Old 23rd April 2006, 02:08 AM   (permalink)
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newbie here!
i would like to ask how can i make that L1 or coil inductance?
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Old 23rd April 2006, 02:59 AM   (permalink)
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newbie here!
i would like to ask how can i make that L1 or coil inductance?
The parts list tells how to make the coil. 6 to 8 turns of insulated hookup #22 wire around a pencil with the turns tight together. Carefully slide out the pencil and admire your coil.
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Old 26th June 2006, 06:29 AM   (permalink)
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ummm, 30 meters? 30 miles? anyone know which it is??? Thank you guys
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Old 26th June 2006, 08:09 AM   (permalink)
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ummm, 30 meters? 30 miles? anyone know which it is??? Thank you guys
Fairly obviously, 30 meters!.
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Old 26th July 2006, 05:00 PM   (permalink)
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I'm a beginer in the electronic component and I wish to know more about that (any documentation or books).
So any one help me I will be very gratefull
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Old 26th July 2006, 07:05 PM   (permalink)
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kewl,, electronics is neat, you just have to surf the web or goto radio shack and get a learning lab for about $60.00... electronics uses capacitors, used to hold a charge, there sometimes round and tall, or small and looks like a paper ufo, then you have resistors, these are simulare to the led in a pencile, if you drawl a line with a certain type pencile and hook a ohm meter up to the line you drew, you can mesure the resistence of that line, the longer the line and less lead the more it resist. for example, a wire dont resist that much,,,,''Next you have your diode. in electronics you have a N type silicone and a P type Silicone, Positave + can only travel threw the P type, and Negative can only travel through the N type silicone, this stuff is man made, it is cooked, back to the diode.

if you hook a light to a battery and then it comes on, place a diode between the light and the battery, if done right, the light will come on, if you hooked the diode up backwards, it will block the current. since N Voltage cant travel threw a P type silicone,,, next you have a Transistor, they come in NPN or PNP its a silicone sandwich. you hook the light up to the transistor and the middle leg is the gate, or swith,, youd have to read up on the transistor to understand it more. then you have coils. you run a voltage threw a coil and it makes a wave, you unhook the volts from a coil and the volts rush out of the coil. so if you hook a ceramic cap to the coil you would have a oscilating circuit. google that! now try electronics in the howstuffworks.CCOOMM
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Old 26th July 2006, 07:38 PM   (permalink)
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What has this got to do with the topic title?
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Old 27th July 2006, 08:14 AM   (permalink)
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that was for Hlaim

Last edited by triple_access; 27th July 2006 at 08:17 AM.
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Old 27th July 2006, 03:58 PM   (permalink)
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Well, Triple Access has certainly given my poor old eyes a new outlook on electronics!

JimB
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Old 27th July 2006, 09:42 PM   (permalink)
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Well, Triple Access has certainly given my poor old eyes a new outlook on electronics!

JimB
Yeah, I now see I wasted 5 years of my life getting my EE degree.
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Old 31st July 2006, 02:12 PM   (permalink)
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WOW, that lesson has enlightened me to the ultimate level that I just might retire to a high peak in Nepal, sitting endlessly in the Lotus position while postulating how the colors RED and BLACK came to be indicators of positive and negative. Must be a Yin/Yang thing. I wonder if they serve up "silicone sandwiches" in a Nepalese monastery?

To me "silicone sandwich" means my face burried between a couple of size D cups!!
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Old 31st July 2006, 02:21 PM   (permalink)
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Originally Posted by triple_access
kewl,, electronics is neat, you just have to surf the web or goto radio shack and get a learning lab for about $60.00...
The only thing I have ever learned from Radio Shack is that the sales people are often clueless, they spend more time ringing up a cash sale than it takes to mow a hilly 1 acre lawn using a push mower, returning an unwanted item for a refund is like trying to get Rowe v Wade overturned in Congress, I can locate the desired component on a peg or in a drawer faster than they can, and their advertising slogan, "You've got questions, We've got answers" equates to nothing more than me asking when they close for the day and they reply "We close at 8pm, but I might pack it in earlier if business remains slow."
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