Ren's two transistor CFL circuit

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Science & Technology

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• Ren's
• two
• transistor
• CFL
• circuit

[Drevtoobe]

Hey Lidmotor, that last clip you favourited, Mr. AllAmericanFiveRadio is great, and he is great. He has lots of clips on basic electronics that are really well done and I love his presentation.

A little trick is to do the same basic NPN setup with a 2N2222 but have 12 volts to a relay coil then to the transistor collector. Then just lick your finger tip and touch it across the collector and base leads and like magic the relay switches on. Current apmlification!!!!

[Lidmotor]

Mr AllAmerican's videos are very helpful. The one that I favorited really helped me understand the basic concept of how the little 2n2222 is doing what it is doing. It also reminded me NOT to leave a multi meter in a circuit because it has a power source and circuit values of it's own.

[dodoshlodo]

thanx, that would make sense, I was measuring the back emf coming off the battery the other day, and blew my multimeter when i introduced a spark gap

[Can101276]

Ahh yes... allowing the conventional current to momentarily pause and jump the gap, allows the radient or negative energy to essentially build up in the area of the spark gap. Seems that even when it comes to electricity the universe seeks ballance.

[Lidmotor]

Thank you once again. I am learning something new almost every day. A "darlington pair"---now I know what it is and what it does. 50x50 --- that explains alot and why the two transistors are paired the way they are in this circuit.

[Drevtoobe]

Transistors are current-based animals. The main spec is the 'Hfe', which is the current amplification and is typically about 50.

If you put one unit of current into the base terminal, then 50 units of current flow into the collector terminal. Therefore, 51 units of current flow out of the emitter terminal. Note how when you cascade two transistors together in your circuit the current gain becomes 50 x 50. It's called a "darlington pair."

[Drevtoobe]

Yes indeed. When a multimeter is on ohms resistance measurement it is actually quite vulnerable. The only way to measure resistance is to pump juice through the resistance and measure the current flow, hence the battery inside the multimeter. If you accidentally have the multimeter set on resistance and put the leads across a battery to 'measure voltage', the battery can blow the multimeter.

[armakuni2000]

Super discovery!!!! That spikes are exactly radiant spikes yahoo fantastic!!!

[Drevtoobe]

Just a general comment about the earth ground. Think of it like there is a giant conductive sheet of soil on top of the bedrock all over the planet. It is not a perfect conductor, it depends on the type of soil, the moisture content, thickness, etc. However, it is so large that we can look at it like a generic electrical ground. There may be some minuscule electrical noise and telluric currents in it, but it is not a source of electrical power in any way, shape, or form.

[Drevtoobe]

The glass of salt water with the crystal in it would be nothing more than a demonstration of the capacitive coupling effects that have already been discussed before. Putting just about any object next to a CFL creates a stray capacitor to ground between the CFL glass tube and the object. The high-frequency AC potential current 'leaks' through this stray capacitor and the CFL gets brighter as a result.