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MEGO

A miniature power supply for low wattage circuits and electronics.
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Features

MEGO generates wide output DC voltage from 4V to 24V with maximum output power of 6 Watts. The device is also designed to fit the standard 840 holes breadboards, so you are no longer bothered with the wiring headaches to power your circuit. The embedded 2000mAh rechargeable lithium polymer battery makes it truly convenient for applications that require portable and immediate power.

Functions

The basic components and their functions are illustrated by the following figures.
We strongly recommend users to set the output voltage to 5V or less once you finished doing projects with MEGO.

Specifications

Dimension

Parameter
mm(inches)
W
73(2.87)
L
59(2.32)
H
32(1.25)
D
62(2.44)
E
56(2.20)
Gross weight: 100g (3.5oz)

Electrical Specifications

Output Voltage
4-24VDC
Maximum Power
6W
Overload Protection
Yes
Short Circuit Protection
Yes
Battery Capacity
7.4Whs
Typical Power Efficiency 1
88%
Voltage Display Accuracy
<1%
Ripple Voltage 2
<1%
Load Regulation 3
70mV
Operating Temperature
-15 to 45 °C
Storage Temperature
-20 to 50 °C
  1. 1.
    Calculated at V out = 5V
  2. 2.
    Measured under V out=5V, 9V, 12V
  3. 3.
    Measured at V out=5V, I out from 10mA to 1000mA

Battery Capacity

The battery capacity of MEGO is 7.4Whs, or 2000mAh at 3.7V. As a power supply, giving watt-hours allows you to quickly approximate the duration of operation using simple equation.
For example, using MEGO to drive a DC motor rated as 400mA @ 7V:
Step1: The power consumption of the DC motor is:
Step2: Assuming 100% of efficiency, a fully charged MEGO can technically last for:
Step3: Count in the factor of efficiency, assuming 80%, then the approximated lasting time is:
But in practice, the device will most likely shut down before 2.2 hours simply because the battery voltage level is below the minimum threshold for the internal DC-DC converter, so some extra safety margin should be given if your application is very strict on the continuous running time.

Instruction

Turn ON/OFF the device
Charge the device
Adjust output voltage
Meaning of the LED Indicators
Use with a breadboard
Power non-breadboard circuits
Charging smartphones
In some situations where you have a low battery cellphone but do not have access to a wall plug, MEGO can be used as a power bank. The USB output port on MEGO was designed to be compatible for charging most types of smartphones.
Be sure to set the output voltage to 5V or less before you charge the phone.
The charging current was restricted at 500mA so it will be slower than using a wall adapter.

Advanced Applications

Some applications might require two MEGOs.

Powering Dual Rial Op-amps

Some integrated circuits such as Op-amps may require dual voltage supply for powering up, which means that you need to have both positive and negative voltage. A dual voltage supply setup can be achieved with two MEGOs by using the setup as shown below.

Large Output Current

Some devices require higher electrical power while operating, such as DC motors, LED arrays, transmitters, speakers… Since each MEGO is recommended to operate under 5W, if you want to drive electronics with higher power consumption, a simple way is to set multiple MEGOs in parallel mode as shown below, to enhance current supply capability.

Measure DC Voltage

MEGO can be also used to measure DC voltage. Before you do that, keep in mind that MEGO CANNOT source and measure simultaneously. You can measure a DC voltage (within 3-30V range) using the USB to alligator clip, but make sure you TURN OFF the device first.