Showing posts with label datasheet. Show all posts
Showing posts with label datasheet. Show all posts
This kit comprises a commercial 14-button remote control unit and a 12 channel relay board. All 12 relays are provided on the receiver board - nothing more to add. This makes it very simple to add infrared remote control to any project or existing equipment.

Specifications:

* Indicator LEDs are used to show which relays are on
* L: 3 3/4" x W: 1 7/8" x H: 3/4"
* Relay Board Requires external 12 volt DC 500 mA power supply, Remote Control requires 2 AAA batteries.
(Need a Power Supply?)
* Each relay is numbered to match number on remote.
* 60 foot range
* Relay contacts rated 240VAC at 10Amps
I needed to calculate the voltage on a capacitor after a given time, and also needed to calculate the time required to charge a capacitor to a given voltage.. maths being rusty (and losing my SC which had all the formulas programmed in ) I resorted to Excel.

The attached .xls (in .zip) may be of use to others.. it contains 2 simple routines..

1.) Given applied voltage, R, C, and time (t), it outputs the instantaneous voltage across the capacitor at t.

2.) Given applied voltage, R, C, and the voltage required across the capacitor, it outputs the time at which this voltage appears across the capacitor.

You will need the LN() function installed in Excel or (other spreadsheet) If you have an RC circuit, you can solve the following differential equation:

EMF = Vr + Vc (Kirchoff's Voltage Rule)
Vr = IR = (dq/dt)*R
Vc = Q/C
EMF = (dq/dt)*R + (Q/C)

After solving the 1st order differential equation, you get
q = C(EMF)(1-e^(-t/(RC)))
i = dq/dt = (EMF/R)e^(-t/(RC))
This is for a DC circuit where the capacitor and resistor are in series.
My Zimbio
> TopOfBlogs .sg   TopOfBlogs