12v DC LED Light with 18 Superflux LEDs

I have just completed a 12V DC based LED light which uses 18 Superflux (four legged/ Piranha) LEDs. These LEDs have capabilty of taking currents upto 70mA. I have divided them into 6 strings of 3 LEDs each.

Each string is driven by a constant current source. This was the reliability is improved and we can use simple transistors to create the constant current source.

By default I drive the LEDs at around 34mA.

There are 4 Amber/Yellow LEDs which I use and these are put in place so that the light will work even if the battery voltage drops to below 10.5 Volts (albeit with reduced brightness).

I have just put up these on ebay for sale. And some have asked me to supply these with all white LEDs. I have obliged but would prefer to sell them with the 4 Amber/yellow LEDs.

Here are the pictures

Multimeter - Learn to use for Voltage measurements

https://youtu.be/k-Ib9f8CTGA

USB Meter - For Measuring Capacity of a USB Power Bank & Other 5V Devices

You have bought a power bank and are wondering if it really measures up to the advertised Capacity? Check with this Power Meter. You can connect it to any USB Power Source like your Power Bank. It will Show you the Output Voltage of the Power Bank - This should be 5V On the USB Female side you connect your Load. You can then see the Current that the Device Consumes. Leave it on for a while and it can give you an indication of the Power Consumed. This is also the Power delivered by the source (Could be your Power Bank) It measures Voltage & Current - Power = Voltage x Current (For DC Voltages like this one) The Total Energy that can be delivered by your Power Bank = The Capacity of your Power Bank. Energy (Or Capacity) is the ability for the Power Bank to give X Watts for T Time before it runs out of juice. Hence TIME is the factor that comes into play to measure the Total Energy that can be delivered by your Power Bank or The Capacity of your Power Bank Capa...

Annunciator

Design & Development of Annunciator . For a California based Company redesigned their annunciators around modern technology. The annunciators could handle 1 to 128 input modules with inputs to display from 8 to 1024 zones. The original full analog design was simplified with a single main PCB with a powerful microcontroller and multiple smaller PCBs with smaller microcontrollers, Analog & Digital inputs and outputs. PC based Software was developed to configure the system for multiple parameters. The duration of the project was 8 months.Test jigs were replicated at both places (USA & Goa, India).

Electronics Engineering

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