UNIVERSAL ANDROID CHARGING PORT SETUP

This is a great replacement part if you can’t get hold of the original.

 









The standard Micro USB pinouts for power are below.








Next to Ground is the ID pin followed by Data+, Data- then VCC.
Some (very few) devices require the ID pin to be connected, this can be bypassed with a 130k resistor connected to Ground. This is supposed to be used to tell the device if an OTG cable is connected, hence rarely used for charging.

NOKIA GS101 OR ONLY CA-101 / RJ45 GS101 OR MICRO USB PINOUT CA-101 CABLE

rj45 GS101 or micro usb pinout CA-101 cable. 

 nokia micro usb ca-101

APC USB CABLE SCHEMATIC AP9827

Pin	Name	Direction	Color	Description
1	USB +5V (red wire)			USB +5V (red wire)
4	chassis ground			chassis ground
7	USB GND (black wire)			USB GND (black wire)
9	USB Data- (white wire)			USB Data- (white wire)
10	USB Data+ (green wire)			USB Data+ (green wire)

USB MULTIMETER POWER SUPPLY

Typically, the multimeter is powered by a nine-volt battery type "Krona". It is inexpensive, but it ends abruptly. Moreover, now almost everyone has a device powered by a USB port - laptops, tablets, smartphones, and the corresponding chargers. Here is a description of the voltage converter unit to power the multimeter from any USB port or from a charger with a USB connector. The task of this unit is to increase the voltage 5V, available on the USB-connector, to a voltage of 9V, necessary to power the multimeter.
The figure shows a diagram of a simple unit that allows you to get a stable DC voltage of 9V from the USB port, provided that the load current does not exceed 150 mA. Using such an adapter, it is possible to power not only a multimeter from a USB port, but also other circuits and devices powered by Krona.
The circuit is based on a DC-DC converter on the LM3578AM chip. Since the converter is pulsed, an inductance L1 is installed at the input, which prevents the penetration of pulsed noise into the circuit of the device, the USB port of which serves as a power source. As part of the A1 chips, there is a pulse generator with PWM, and an output key. The key goes to conclusions 6 and 5. Pin 7 is the input of the control protection circuit, which determines the current through the key by the value of the voltage drop across the resistance of the resistors R2-R4. And when it exceeds the permissible value, protection is triggered.

Voltage is pumped at inductance L2. Then, this alternating voltage is rectified by the Schottky diode VD1 and smoothed by capacitors C6 and C7. The output voltage is stabilized by comparing the voltage removed from the R5-R6 divider with the reference voltage generated by the stabilizer, which is part of the microcircuit. The control input is terminal 1. Resistors R5 and R6 form a voltage divider, with which the output voltage is divided so that with the required output voltage of 9V, terminal 1 A1 has a voltage of 1V.
The output voltage is greater, the greater the division ratio of the divider R5-R6. In principle, the maximum output voltage can be made much higher (but not more than 30V). You can increase the output voltage by decreasing the resistance R6 or increasing the resistance R5.
Mounting the converter is most conveniently done on a small printed breadboard.
Chokes L1 and L2 - finished, industrial production.
Conventional resistors have a significant variation in resistance, so if the output voltage is less than 8V or more than 9.5V, you need to choose R5 or R6.

Author: Zhurbin A

USB POWERED LABORATORY POWER SUPPLY

USB is currently a universal computer port to which a wide variety of devices connect. A fairly powerful 5V voltage source is output to USB, so many devices not only exchange data through it, but also are powered by a USB port. These are various scanners, webcams, portable CD or DVD-drives, modems, etc. On the Internet you can find descriptions of very stupid trinkets powered by USB - micro-vacuum cleaners, tea heaters, and even microcoffee makers.
In principle, many other peripheral devices that are not designed for this can be powered from USB, but there are some limitations. In particular, according to the supply voltage, which is only 5V. Despite the fact that peripherals powered by their own network adapters usually require a higher voltage, and even 5V is not always what you need to power many homemade products.

The figure shows a diagram of a simple adapter that allows you to get a stable DC voltage from a USB port adjustable between 1.4 and 35V, provided that the load current does not exceed 350 mA. Using such an adapter, you can power a variety of circuits and devices from a USB port, and even use it as a laboratory source, which is most important when working with a USB laboratory or an affordable set of programs such as those that allow you to turn a PC with a sound card into low-frequency oscilloscope, millivoltmeter, low-frequency generator, frequency meter (such programs are usually available on the Internet for free).

 The circuit is built on IC LT1372, designed to build circuits of DC-DC voltage converters. The built-in generator generates pulses with a frequency of about 500 kHz. The stabilization circuit adjusts the latitude of these pulses and feeds them to the output switch on the output transistor, which is part of the microcircuit. The chip has protection for the output transistor against overcurrent through it. With a current through it of more than 1.3A, protection is triggered. The protection is based on the principle of measuring current by measuring the voltage across the resistance in the emitter circuit of the output transistor. Measuring resistance is part of the chip.
An inductance L1 is connected to the collector of the output transistor, on which the AC voltage is “pumped”. Which is then rectified by the diode VD1 and smoothed by the capacitor C4. The output voltage is stabilized by changing the latitude of the pulses arriving at the base of the output transistor. The sensor for measuring the output voltage is a comparator. Pin 2 should have a voltage of 1.25V, voltage is supplied to this pin from the output of the circuit through a divider on resistors. And the comparator adjusts the pulse width so that it is exactly 1.25V on pin 2. Thus, by adjusting this voltage divider, the output voltage can be adjusted. With the resistance of the resistors R3-R5 indicated in the diagram, the output voltage can be adjusted from 1.4 to 35V.
Since the block was supposed to be universal with the ability to quickly adjust the output voltage, three VD2-VD5 diodes are included in the circuit between pin 2 and the common minus. Their task is to limit the voltage at pin 2 so as not to damage the microcircuit during a sharp rotation of the shaft R4 in the direction of reducing the output voltage.
With an output current of up to 0.35A, a radiator is not required.

 Author: Zhurbin A

HOW TO DISSASSEMBLE – APPLE USB SUPER DRIVE – HOW TO REMOVE THE CASE – HOW TO REMOVE THE OPTICAL DRIVE

How to dissassemble – Apple USB Super drive – How to remove the case – How to remove the optical drive

Apple USB Super drive

DISASSEMBLING PROCEDURE 

To open the SuperDrive we must remove the lower case.

The lower case is attached by 8 clips.
6 along the sides
2 on the back 

Insert a metal spudger down between the black lower case and the aluminum upper case. Lightly pry back to gently lift the clip out of place, just far enough to disengage.

Don't lift to far, or the clip on opposite side of drive will be wedged in place.

Repeat Step 2 for each of the 8 clips. Continue until all of the clips have been disengaged and the lower case is free.

Lift off and set aside the lower case.

Remove the screws holding optical drive in the upper case three 3.8 mm with 1 mm deep head #00 Phillips head screws.

Lift the optical drive from the thick side, then pull out.

Be careful of the wires still running from the drive to case.
When re-installing the optical drive insert tongue in groove side first, as pictured.

Remove screws holding the board to optical drive. two 3.8 mm #00 Phillips head screws.

Use a plastic opening tool to remove the board from the optical drive. The optical drive is now free from the case.

HOW TO RELOAD THE FIRMWARE FOR USB FLASH DISK, UFD REPAIR

How to reload the firmware for usb flash disk, UFD Repair

In this example I use UFD JOGR older, run communication IC's Alcor AU6981

Run the software for IC communication AlcorMP AU6980/6981 following form (Figure 1)

1. Click the Setup button to set parameters, the login screen will ask for your password, click OK to ignore, the program Setup screen appears (Figure 2).

2. Flash card type
Flash O: You choose a name corresponding to the IC chip on the UFD to your EPP (this is the name of memory chips is controlled by IC communication).
RW cycle time (cycle time of a write / read): you select the desired time, smaller the UFD write / read faster. However, if smaller than the delay time of memory, the write / read will fail.
If you know the parameters of the investigation on the memory chip www.alldatasheet.com to biets RW cycle time of it.
If you do not know can work a few times, changing the cycle time and RW write / read messages, no error is OK.
3. Card Mode (Figure 3)

You can adjust the parameters in the Set Mode:
Common Disl AP: Shared (who is also using the UFD)
Fixed: Using fixed on the machine (to handle it)
Disk readonly: Only read / write is not clear.
Disk Password: Set password.
Auto run: autorun file on it.
CAP set: set the desired size. This allows "fake" capacity. But you know not to do.
Partition set: Set the size for the partition to create, of course, should be 100%. Unless you checked that your UFD error at the end of memory map, then gradually adjust (cut like bad hard drive in PQ)
4. Card Information:
Set information about the manufacturer. If interested, then can his name (without quotes)
Note: You may understand the value to raw VID and PID (I'll talk about this later)
5. Bad card block: For Auto check. Then the software will automatically localize errors in memory chips.
6. Card S / N: Set the serial number for UFD are handled.
After you have done so, OK to return to the main screen (Figure 1)
Click the button to start format LLF low, but larger capacity long.
Once finished, remove the UFD from the computer, plug it back will always run

USB FRONT PANEL PINOUT ASSIGNMENT

USB Front Panel Pinout Assignment

The following image is the USB Front Panel Pin out Assignment.

Some of old computer cases have divided the USB front cable. Usually there are 8 cables with a port on each cable. Every port marked with a note: “VCC” for red cable ; “GND” for black cable ; “D+” for green cable ; and “D-” for white cable. If your computer case has this kind of ports, then you should arrange the USB front panel port refer to above USB pinout connection.

You may use this USB pinout assignment to support your small 5volt device such cool pad, computer fan, cell phone charger. Use the pin of +5 and GND to get 5V DC supply.