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Transistor can be used as a power switch in power mangement
BJT & MOSFET are commonly-used transistor in electronic design
why sometimes BJT is used as a power switch (because of low current, low voltage, low cost or related vbe, large current leakage?)
why sometimes MOSFET must be used as a...
Hi Folks,
External booster is required to step up voltage from 3.3V to 18V to drive OLED.
The max. loading current for OLED is around 20mA.
Is there any cheap alternative method to step up voltage from 3.3V to 18V instead of using booster ?
Thanks,
Ricky
Hi folks,
I did many projects using LCD (TN, STN, CSTN).
But now I got a project to use OLED + driver.
I am not familar with OLED, what is advantage & disadvantage compared with LCD
Any suggestion ?
Thanks,
Ricky
Hi folks,
Do you know what is resistance for water (sea water, distilled water..........etc) ?
Does resistance for water vary for a large range ?
Now I am doing a project by using water resistance to turn on or off the NPN.
Thanks,
ricky
Thank for all guys share your design knowledge on battery life.
I am using 4 x 1.5V D-cell Energizer Alkaline in my project.
The battery life is not enough. What we expect is to double or trible the battery life. So, besides D-cell alkaline, what kind of batteries I can use to make this...
Each battery has different internal resistance and voltage
Current may flow from 1 battery to other while //
Are you HK guy or China guy, wizpic.
Let's share the knowledge if you don't mind
My msn is ricky.wcy@gmail.com
Yes, series 1.5V batteries will lead to increase voltage not capacity
I use 6V because I need to drive motor
Let me explain in more details for my circuit
-----------------------------------------------------
1. Motor (operating voltage = 4.5V - 6V)
2. MCU (operating voltage = 2.7V - 3.3V)...
Loading current = 500mA
4 serial D-cell battery = battery life is 12hrs
The Question is how to double or triple battery life by
Option A
(Diode + 4 serial D-cell) // (Diode + 4 serial D-cell)
Is it possible to double battery life ?
Option B
(Diode + 4 serial D-cell) // (Diode + 4 serial...
Is it enough to use 8x1Mbit flash memory to store all the following data
1. Total data = 200
2. Each Data format = Year (4 digit) + Month (2 digit) + Date (2 digit) + No.of count (5 digit)
3. All digits are in decimal
infrared tx & rx module
How to calculate the current consumption I turn IrLED (Tx, Rx)
Conditions:
1. Turn on for 24 hrs (both Tx, Rx)
2. Max. driving current = 60mA
infrared tx rx
HI folks,
I need to use InfraRED Tx RX module is new project.
I do not have such experience.
Any any guys give some recommendation to me
1. module no. or part number ?
2. normally standby current of both Tx & Rx module ?
3. Any class ? (i.e range limit for each class) Just like...
I am doing some analog circuit design mainly using
NPN + PNP + capacitors + resistors
Any simulation software can do accurate simulation to show transient response in the market
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