It is the end user’s responsibility to see to and to carry out proper implementation their own repairs and modifications. Ultimately the end users hold responsibility for how they implement their own repairs.
This guide assumes you are familiar with basic understanding of electricity and than you can build a simple electronic circuit. I am only going to cover the basics and what fits in the preview of Tech Talk.
What is a Diode?
The ideal diode is to control the direction of current-flow. Current passing through a diode can only go in one direction, called the forward direction. Current trying to flow the reverse direction is blocked. They’re like the one-way valve of electronics. –Sparkfun
That a Diode has low (ideally zero) resistance to the flow of current in one direction, and high (ideally infinite) resistance in the other. –Wikipedia
A Diode can be made from a vast selection of materials, the actual semiconductor as well as the outer case.
What type or diodes are out there?
Zener Diode - useful in creating a reference voltage or voltage stabilization
Diode Rectifier – often used for reverse voltage protection
Bridge rectifier (also known as a diode bridge) – often used to converts AC to DC, can be purchase as a single component or made from 4 or more diodes.
Schottky Diode - known for their low forward voltage drop and a very fast switching action
Light Emitting Diode or LED – used for low voltage light. Some LEDs produce infrared or ultraviolet light instead of visible light.
Photodiode – a Diode that converts light into electrical current. Traditional solar cells are an example of a photodiode. So are Diode light sensors.
Thermal Diode – use to electronically monitor temperature
Why we [at Tech Talk] should care about Diodes?
Other than the obvious LEDs for lighting, diodes are often also used for pad hacks, rectifiers on power supplies and other applications when we want to electrically isolate something.
How to “wire up” a diode?
Every diode has two (2) terminals and they are polarized. The two terminals are the anode (+) and cathode (-). Current flows from the anode end to the cathode, but not the other direction.
As you see in the image above their is the symbol for diodes use in circuit diagrams as well as two illustrated examples of a diode.
The stripe on a diode identify the cathode end of the Diode.
Some PCBs for Dual-Mods require diodes to be installed. The Diode is soldered to the signal line/pad/terminal of the PCB with the other end going with that button signal line to the rest of your Dual mod.
The anode (-) end of the diode is to be soldered to the PCB and the cathode end going towards your buttons.
For your particular board please address your boards relevant guide/thread.
Thirdparty PS4 Padhack options - Third party PS4 padhack options
For those who don’t know what diode to use, almost any normal diode would do. You can get away with using a Zener, Schottky or rectifier diode.
Don’t worry about the amperage for the diode as the PCB should operate in lower range that the maximum amperage for most diodes.
I recommend a simple signal diode, examples are Digikey, part # : 568-1360-2-ND or Mouser Part #: 771-1N4148-T/R
Diodes can also be used in conjunction with other components to make a PCB that not common ground to be compatible.
The two terminals of a LED still have the same designations as other diodes, a anode and cathode end but there markings are different.
Almost always the Longer leg of the LED is the Anode and the shorter leg the Cathode terminal. The LED it self will also have a flat side indicating the cathode side.
SMD LEDs will have a mark with resemblance to the symbol for diode denoting the cathode end.
You also always want to include a resistor with your LED wired to the cathode end of the LED. This will prevent the LED from burning out
You can follow Ohms Law (V = IR) to find the resistance needed. So we follow the formula R = (Vs - Vf) / If
R = Resistance in Ohms
Vs = Supply Voltage (ex. 3.3V)
Vf = Forward Voltage or Voltage Drop
If = LED Current Rating (ex. 20mA or 0.02A)
Or you can use a Online LED Calc http://bfy.tw/1qXp
Forward or drop voltage should be included in your LEDs data sheet or packaging. Some will give both a min and max values, use the average between these two.
Typically the forwards voltage goes by light temperature or color
The Supply voltage is the voltage your supplying from your board or batteries.
You can cheat with this guide if you do not know or can not find the forward voltage but this is not 100% accurate and is a generalization of what require for each color.
As LEDs from different manufacturers will have different specs with different forward voltages.
There also guides online to how to find your Forward voltage for a LED.
Once you find your resistance value needed know that you can go with a higher Ohm resistor with the only side effect being how bright the light is.
You never want to go with a lower Ohm resistor. So for example if you came up on the math needing a 43 ohm resistor but can’t find a 43 ohm resistor you can use the next closest rounded up like a 50 ohm resistor.
I come back and edit the guide later, if you see something wrong PM me so I can make any changes.