Battery

[OLLYDOTDEV]

As a user There needs to be some way that ROM's from work without the need for it to be plugged directly into the source of external power. So a fix would be to add some sort of battery to the system

[OLLYDOTDEV]

At first when Research started into providing power to ROMs it was decided that there will need to be some sort of capacitor to smooth out the waves coming from the power source As the act a bit of a Reservoir as in when there is a lack of energy days are able to provide a small boost and when there is the increased it is able to absorb some of that excess energy

[OLLYDOTDEV]

Talk more about the physics behind sine waves and Pulse width modulation https://www.allaboutcircuits.com/textbook/alternating-current/chpt-7/square-wave-signals/ Square waves are equivalent to a sine wave at the same (fundamental) frequency added to an infinite series of odd-multiple sine-wave harmonics at decreasing amplitudes.

[OLLYDOTDEV]

That then raises the question of how I am going to power the ROMS and its core components #2 , #4 For this, I will be needed to provide two volage levels a 5v rail and also a 3.3v rail so for this I thought I would play it on the safe side and use two CR2032 - 3V due to there small size and a total output of 6v or does it

Volage discharge rate chart (top image) CR2032 N placed in series resulting in 6 volts (bottom image)

As seen in The image above initially the coin battery starts off what's above 3 volts around 3.2v. Since I will be running two of these and parallel will give me 6.4 When fully charged (new) And this could completely fry any regulators if you were just basing the typical output on his average discharge voltage. So where I had initially thought hey 3 + 3 is 6 OK let's get a regulator that is writing for a maximum of 6 volts recalculating and with that I needed the minimum Of at least (having more overhead is find )7 volts best safe So not too fry my components as the only rated for Max of 5 volts or 3.3v. To prevent this I am looking at USING two 3.3 (for this led PCB,https://github.com/OLLYDOTDEV/Project-Birdseye-DTX-2020/issues/6#issuecomment-643615355,https://github.com/OLLYDOTDEV/Project-Birdseye-DTX-2020/issues/5#issuecomment-643613012) and 5 volts (for ROMs,https://github.com/OLLYDOTDEV/Project-Birdseye-DTX-2020/issues/2) regulators

Now time to research more sort of regulators there are out there and what suits my purpose best

[OLLYDOTDEV]

After coming back from https://github.com/OLLYDOTDEV/Project-Birdseye-DTX-2020/issues/8#issuecomment-643615584 and looking into regulators I have found that there are 3 Primary types of Voltage Regulators

Linear Regulators Switching Regulators Zener Diodes Buck converts

In the end, I Decided To go with a Low dropout Linear Regulators. So I due to the fact that my input voltage of 6v is close to the 5v I can Afford to use Low Dropout Linear (LDO) otherwise the heat as any extra voltage is converted to heat so with having only

The main pro with this is the fact that they are simple/cheap / produce low noise as just said the only issue is that any excess voltage gets turned into heat there for giving them limitations and but this is not an issue in low voltage appliances where the low supply voltage and is close to the voltage out and when you require low noise environment. Which is exactly my use case.

From past projects, I have found that a good place to start of looking for parts is Digikey(Low Dropout Linear Regulator)

After looking on Digikey and not finding what I am looking for I took to google And found this page. It houses the datasheet for a series of LDO’s

I have a choice to use LT1763CS8-3.3 to provide 3.3v rail and LT1763CS8-5 for 5v rail These LDO have 8 pins, four each side.

These pins are BYP (Pin 6/Pin 4) achieve low noise performance from the regulator if not used do not connect pin 06

IN (Pin 10, 11/Pin 8) (VIN is the completely unaltered input power before the regulator)

Power into regulator

I will be Replicating the circuit in below in Eagle for LT1763CS8-3.3 And LT1763CS8-5 Libraries have also been added LT1763CS8-3.3_TRPBF.lbr And LT1763CS8-5TRPBF.lbr So that the schematic has the needed parts from the datasheet

The bypass pin is not utilized due to the fact that it is only needed for when you're trying to achieve lower noise to Signal ratio and these LDO all ready have a signal to noise sufficient to my needs

it should be noted that it was considered to uses resistors to make a volage to make a voltage divider to drop the volage

[OLLYDOTDEV]

With the power delivery designed The now I need to implement it to my schematics Some other things to keep in mind is that I also need to take 6v From ROMS to the LC_Board via #5

It was thought able having the 3.3v regulator on the ROMS then send 3.3v to LC_board but It

It occurred to me that rather need to redesign a very similar item in a future project that it should be designed to be able to work independently of other components and be a standalone subsystem as will be seen in #6 .

[OLLYDOTDEV]

This marks the completion of Of the first implementation of the Schematic git(power system for the LED)

[OLLYDOTDEV]

So after viewing at the end of sprint meeting with my self I work out that some of the need parts for the battery/power system can no longer be brought due to COVID-19

https://github.com/OLLYDOTDEV/Project-Birdseye-DTX-2020/issues/11#issuecomment-644455695 so no longer with access to my first choice of power regulators I am will have to drop the supplied voltage to the ROMS PCB down to 4.5v from 6v. 4.5 voltages will be provided by 3 AA batteries giving around a nominal voltage of 1.5 voltages * 3 gives me the needed next best case.

To deal with any power fluctuation I will use a 10uf 50v capacitor to normalize the output voltage by holding any extra check that might occur with a power spick but also hold some charge so that if there is a small dip in the output voltage it is able to make up for the lost of voltage and keep it at an equilibrium