 |
No items matching your keywords were found.
|
No items matching your keywords were found.
Constant Voltage Diodes
Exact base current function in an NPN transistor?
Is there an exact relationship (or very nice estimate) for the base current as a function of the base-emitter voltage for an NPN transistor? I realize that it may be a function of Boltzmann's constant, temperature, etc, much like a simple diode, but I don't know how it differs.
And I understand that the relationship is exponential, but what is the power argument in the exponential?
Im not very sure. But I think its some approximation Quantum Electronics
|
No items matching your keywords were found.
|
No items matching your keywords were found.
|
No items matching your keywords were found.
|
 |
(10) NEC RD20E-T4 Constant Voltage DIODE 500mW DO-35 NEW |  |
 |
US $2.99 | 21d 20h 26m |
 |
(10) NEC RD68E-T4 Constant Voltage DIODE 500mW DO-35 NEW | |
|
US $2.95 | 9d 19h 18m |
| Powered by phpBay Pro |
|
|
12-key Infrared constant current Dimmer;max 8A constant voltage output $5.79 12-key Infrared constant current Dimmer;max 8A constant voltage output |
|
|
Constant-voltage Transmission $24.37 No Synopsis Available |
|
|
The Diodes $93.99 High Quality Content by WIKIPEDIA articles The Diodes were a Canadian punk/new wave band formed in 1976. They released five albums: Diodes (1977), Released (1979), ActionReaction (1980), Survivors (1982), and Time/Damage Live 1978 (2010). One of the first Toronto bands playing that style of music, The Diodes helped foster the scene in the city. Along with manager Ralph Alfonso, The Diodes opened the first Canadian punk nightclub in 1977, called Crash n Burn, where many of the citys punk bands at that time played. The first band to play the club was The Nerves, on a double bill with The Diodes. The club was closed at the end of the summer of 1977 due to complaints by the Liberal Party of Ontario (the principal tenants of the building). Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 130 Publication Date: 2010/08/01 Language: English Dimensions: 6.00 x 9.02 x 0.31 inches |
|
|
The Constant $9.49 The Constant |
|
|
Voltage References : From Diodes to Precision High-Order Bandgap Circuits $102.38 No Synopsis Available |
|
|
LED Intelligent Dimmer;DC12-48V input;Constant voltage PWM dimmering;Max 6A output;P/N:LT-3200 $25.26 LED Intelligent Dimmer;DC12-48V input;Constant voltage PWM dimmering;Max 6A output;P/N:LT-3200 |
|
|
Voltage Multiplier $68.51 High Quality Content by WIKIPEDIA articles A voltage multiplier is an electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage by means of capacitors and diodes combined into a network. Voltage multipliers can be used to generate bias voltages of a few volts or tens of volts or millions of volts for purposes such as highenergy physics experiments and lightning safety testing. The most common type of voltage multiplier is the halfwave series multiplier, also called the Villard cascade (but actually invented by Heinrich Greinacher). Such a circuit is shown opposite. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 92 Publication Date: 2010/07/14 Language: English Dimensions: 6.00 x 9.02 x 0.22 inches |
|
|
Voltage Doubler $54.86 High Quality Content by WIKIPEDIA articles A voltage doubler is an electric circuit with an AC input and a DC output of roughly twice the peak input voltage. They are a variety of voltage multiplier circuit and are often, but not always, a single stage of a general form of such circuits. The term is usually applied to circuits consisting of rectifying diodes and capacitors only, other means of doubling voltages are not included.The Villard circuit consists simply of a capacitor and a diode. While it has the great benefit of simplicity, its output has very poor ripple characteristics. Essentially, the circuit is a diode clamp circuit. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/07/14 Language: English Dimensions: 6.00 x 9.00 x 0.16 inches |
|
|
Painless Wiring 30101 Fan-Thom Provides Constant Voltage $27.99 Painless Wiring 30101 30101 Fan-Thom; Electric Fan Relay; |
|
|
The Constant Husband $9.99 The Constant Husband |
|
|
Constant Replay $12.49 Constant Replay |
|
|
Constant Future $8.99 Constant Future |
|
|
Constant Companion $8.99 Constant Companion |
|
|
Constant Hate $10.49 Constant Hate |
|
|
Constant Fight $14.49 Constant Fight |
|
|
The Constant Gardener $10.99 The Constant Gardener |
|
|
The Constant Flame $12.49 The Constant Flame |
| Account limit of 2098 requests per hour exceeded. |
A basic solar panel test.
kinda messy maths/electronics question HELP?
E=supply voltage=2v
R=resistance=50ohms
Ib= 'reverse bias current' = 1*10^-9 Amps (1nA)
k=Boltzman's constant = 1.38*10^-23
T=temp of diode=300K
Q=charge=1.6*10^-19
Vr = voltage across resistor (unknown)
Vd = voltage across diode (unknown, doesnt really matter, not trying to find it yet)
By ohms law, E=Vr+Vd
= I*R+Vd
and I = Ib*(e^(Q*Vd/T*k) -1)
wish i could write it neater, but i need to find current I so that i can find Vr.
Since Vd is unknown, im guessing i sub in "E-I*R" in the place of Vd in that final equation? how do i then solve for I?
or is there an easier way to do it that i'm missing lol, just using v=ir doesnt work, it ends up Vr=2 which is wrong as E=2=Vr+Vd
Assuming the diode and resistor are in series, he current across the diode is the same as the resistor.
The Voltage drop across the resistor is calcualted by V =IR
and the Volage (reverse) across the diode is E -Vr
Sorry, comments for this entry are closed at this time.