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How to Connect Car LED Downlight

Last Updated on June 1, 2026 by Swagatam Leave a Comment

A car LED downlight available in the market can be easily integrated to an existing car battery if its rating is identical to the battery’s voltage rating. I have explained more regarding one such request sent by Mr. Allwyn Siqueira. How to Connect Downlight to 12V Car Battery Hi Swagatam,I’ve just spent the last 3 […]

Filed Under: Automobile Electronics, Lamps and Lights Tagged With: Connect, Downlight, LED

How to Connect 5mm LEDs to a 3.7V Li-Ion Cell

Last Updated on June 1, 2026 by Swagatam 64 Comments

connect 5mm leds to 3.7v li ion cell

In this article I have explained regarding how to connect and illuminate a few 5mm LEDs using a 3.7V Li-Ion cell, normally used in cell phones. I keep receiving requests from the readers who seem confused with the connection details of 5mm LEds with a 3.7V Li-ion cell. The requests inspired me to write this […]

Filed Under: Lamps and Lights Tagged With: 5mm, Cell, Connect, LEDs

Parallel MOSFET Calculator Tool: How to Connect MOSFETs in Parallel Safely

Last Updated on June 1, 2026 by Swagatam Leave a Comment

upgrade inverter power by adding mosfets in parallel

The following calculator tool can be used to correctly calculate all the parameters essential for connecting many number of MOSFETs in parallel. This ensures the current handling by the MOSFETs is implemented optimally, without any issues or technical errors, and keeps the MOSFETs safe for long term operations. MOSFET Parallel Calculator Total Load Current (Amps) […]

Filed Under: Inverter Circuits, Voltage Control and Protection Tagged With: Calculator, Connect, MOSFET, MOSFETs, Parallel, Tool

How To Calculate and Connect LEDs in Series and Parallel

Last Updated on May 20, 2026 by Swagatam 63 Comments

LED series

In this article I have explained how to calculate LEDs in series and parallel using a simple formula and configure your own personalized LED displays, now you don’t just have to wonder how to wire led lights? but actually can do it, know the details here. These lights are known not only for their dazzling […]

Filed Under: Electronics Theory Tagged With: Calculate, Connect, LEDs, Parallel, Series

How to Connect Two or More Transistors in Parallel

Last Updated on May 20, 2026 by Swagatam 63 Comments

parallel

Connecting transistors in parallel is a process in which the identical pinouts of two or more transistors are connected together in a circuit in order to multiply the power handling capacity of the combined parallel transistor set. In this post I have explained how to safely connect multiple transistors in parallel, these can be BJTs […]

Filed Under: Electronics Theory Tagged With: Connect, More, Parallel, Transistors

How to Connect a Relay through an Opto-Coupler

Last Updated on May 20, 2026 by Swagatam 56 Comments

opto coupler relay driver circuit

In the following post I have explained how to drive a relay by using an isolated method, or through an optocoupler device. We will learn three methods, first method is by connecting relay directly with the optocoupler output pins, second method is by using external PNP transistors, and third method is by using external NPN […]

Filed Under: Electronics Theory Tagged With: Connect, Coupler, Opto, Relay, through

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