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Transistors

How to Connect MOSFET with Arduino using BJT as Level Shifters

Last Updated on September 17, 2026 by Swagatam 14 Comments

BJT PNP NPN pinouts

The interfacing of power devices like BJTs, and MOSFETs with Arduino output is a crucial configuration which allows switching high power loads through low power outputs of an Arduino. In this article we elaborately discuss the correct methods of using or connecting transistors like BJTs and mosfets with any microcontroller or an Arduino. Such stages […]

Filed Under: Electronics Theory Tagged With: Arduino, BJT, Connect, MOSFET, Transistors

Low Battery Indicator Circuit Using Two Transistors Only

Last Updated on August 3, 2026 by Swagatam 211 Comments

lowbatteryindicatorcircuit 2

In the following post I have explained a simple low battery indicator circuit by using just two inexpensive NPN transistors. The main feature of this circuit is its very low stand by current consumption. The Circuit Concept We have so far seen how to make a low battery indicator circuits using a 741 IC and […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Indicator, Only, Transistors

How to Use Transistors

Last Updated on June 7, 2026 by Swagatam 50 Comments

TO 92 1

If you have understood correctly, how to use transistors in circuits, you might have already conquered half of  electronics and its principles. In this post we make an effort in this direction. Introduction Transistors are 3 terminal semiconductor devices which is able to conduct relatively high power across their two terminals, in response to a […]

Filed Under: Electronics Theory Tagged With: Transistors

How to Connect Two or More Transistors in Parallel

Last Updated on June 3, 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 Make Any Light a Strobe Light Using Just Two Transistors

Last Updated on June 1, 2026 by Swagatam 168 Comments

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If you feel strobe lights very interesting but are disappointed by the fact that these wonderful light effects can be produced only through complex xenon tube then probably you are quite mistaken. It is very much possible to make any light a strobe light if you are equipped with a proper driving circuit capable of […]

Filed Under: Lamps and Lights Tagged With: Just, Light, Strobe, Transistors

Sequential Timer Circuit using Transistors

Last Updated on June 1, 2026 by Swagatam 23 Comments

sequence2Bgeneartor

In this post I have explained to make a simple sequential timer generator circuit which can be used for getting a sequential triggering of a connected load, or can be simply used like a sequential LED bar graph effect generator, using only transistors. The idea was requested by Mr Babusan.  Technical Specifications Is it possible […]

Filed Under: Lamps and Lights Tagged With: Sequential, Timer, Transistors

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