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Or briefly touch the drain to the gate to turn the LED partly on, then float the gate again. That is something you look up in the FET datasheet. RDS on approximately 4.
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Your biggest problem may be that RDS on will vary device to device and is a significant percentage of R Some of us are easily amused. You can pull the gate up to 9 volts, or down to ground – just use your fingers – to turn the LED on or off.
Some of the bigger MMIC, the ones with a grounded tab that can be soldered onto copperclad for heatsink, should also work. Or less than a quid in rightpondian. The LED brightness will very slowly creep up or down. That says that the resistance of a resistor is the voltage across it divided by the current thru it.
And then let it float in either state for hours. The difference between 2. Sign up using Email and Password. The best way to deal with the drop across Q3 is to make sure it is small enough so that you can ignore it. Also, the units are bws123 on the left side of your equation. Dividing two dimensionless values can’t result in units of Ohms.
Tony EE rocketscientist 62k 2 21 Read the BSS datasheet. John Reply Start a New Thread. But choose a different mosfet. Again, manipulating a bunch of dimensionless numbers can’t ever result in a answer in units of Ohms. Anyway, you need at least 2.
Bsz123 you mean ‘Ohm’s Law’?
You know you want the current to be 70 mA. On Sun, 11 Jul Sign up using Facebook. Olin Lathrop k 30 Home Questions Tags Users Unanswered. As long as this is small compared to the total of 1 V available after the LED drop, you can ignore it. How VDS voltage impact here? Sign in Sign in Remember datwsheet Forgot username or password? Of course, re-radiation can ruffle some feathers with the authorities.
That’s the “fee” on stack exchange to ensure sustained good feedback on your future questions. Post as a guest Name. SolveEtCoagula07 1 1 You know that the LED drops 2.
My intention was to re-radiate DAB VHF high band from a communal aerial socket in one corner to the radio in the diagonally opposite corner. The gate leakage is not too many electrons per second. What formula can be used to calculate the value of R1? Reply Start a New Thread. It’s clear what is meant, and I don’t intend to fix it Find R1 by using Ohm’s Law.
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(PDF) BSS123 Datasheet download
How can find that? Given that it supplies 70 mA, this means a resistance of 0.
You still haven’t fixed the units error. Is ‘Ohm’s Lay’ a play on words? The ideal resistance value in that case would be 1. Create free account Forgot password? Byte and Swith Jason Sachs. Andy aka k 10 I guess the 2N would be a smidgen better. Previous 1 2 3 Next.