Experimentative test circuit by using IC 555

I viewed a video on 555 TIMER ASTABLE LED FLASHER from the website link : https://www.youtube.com/watch?v=GdYyxT_GBG4 uploaded by FrenchToast Philip, this video helped me to choose: Voltage value, R1 value, R2 value, Capacitance value as initial reference I referred the wikipedia link for initially designing a blinking light circuit & initially choosing the resistance values & capacitance values, website link : https://en.wikipedia.org/wiki/555_timer_IC Image link when IC 555 is in astable mode : https://en.wikipedia.org/wiki/File:555_Astable_Diagram.svg To search the fixed positive voltage regulator Integrated Circuit [ IC ], i referred the website link : https://www.st.com/resource/en/datasheet/l78.pdf Title displayed in the search engine : Datasheet - L78 - Positive voltage regulator ICs - STMicroelectronics Download file name as : Datasheet - L78 - Positive voltage regulator ICs I used 555 Timer Calculator from the website link to calculate TIME HIGH , TIME LOW, & FREQUENCY after entering R1, R2, & capacitance value : https://www.digikey.in/en/resources/conversion-calculators/conversion-calculator-555-timer I used NE555 calculator in ElectroCalc app from Google Play : after entering: R1 value, R2 value, & Capacitance value to calculate : Time T(on+off), Time T(on), Time T(off), Duty cycle in %, Frequency. I used Timer 555 Calculator app from Google Play : after entering : Ra, Rb, C, to calculate : Frequency, Duty cycle %. I used any of the following website links to convert Frequency to Period : 1 ] https://www.sensorsone.com/frequency-to-period-calculator/ Title displayed in the search engine : Frequency to Period Calculator - SensorsONE, 2 ] https://www.calctool.org/CALC/other/converters/freq Title displayed in the search engine : Frequency & period - CalcTool, 3 ] https://www.calculatoratoz.com/en/time-period-(-using-frequency-)-calculator/Calc-1671 Title displayed in the search engine : Time Period ( Using Frequency ) Calculator I used the Frequency Converter in ElectroCalc app from Google Play : to convert Frequency to Period. To search standard resistor value, i referred : https://pdf4pro.com/view/standard-resistor-values-5-ecee-colorado-edu-1f0090.html Title displayed in the search engine : Standard Resistor Values ( 5%) - ecee.colorado.edu - PDF4PRO, To search standard capacitor value with voltage, i referred anyone of the following : 1 ] https://www.mouser.com/catalog/supplier/library/pdf/NichiconProductCatalog.pdf Title displayed in the search engine : ALUMINUM ELECTROLYTIC CAPACITORS - Mouser Electronics, Download file name as : NichiconProductCatalog.pdf 2 ] https://www.anglia.com/literature/passiveBooks/CapacitorBookDownload.pdf Title displayed in the search engine : The Capacitor Book 0913 - Anglia Components, Download file name as : The Capacitor Book 0913 3 ] https://mikroshop.ch/pdf/elnare3.pdf Title displayed in the search engine : Standard Capacitors - MikroShop, Download file name as : untitled T convert Microfarads to Farads, i used the online Calculator from the website link : 1 ] http://www.unitconversion.org/electrostatic-capacitance/microfarads-to-farads-conversion.html Title displayed in the search engine : Microfarads to Farads Conversion Calculator - UnitConversion.org 2 ] https://www.unitconverters.net/electrostatic-capacitance/microfarad-to-farad.htm Title displayed in the search engine : Convert Microfarad to Farad