Oct 27, 2011 · I have a high current load to control with Arduino (25 amps approx.). My idea is to join cheap and easy to find NPN transistors in parallel to control the current (pwm current control) capable of 40 amps or more for safety reasons.

May 14, 2021 · I have been on many projects in industry where trying to parallel up transistors has been tried and it has always failed. That's unhelpfully pedantic, you can easily parallel transistors using small-value emitter resistors as you know.

May 21, 2020 · I want to use the PWM output from the arduino to turn on two NPN transistors at the same time. Checking with a multimeter shows that there is around 0.9 V going to each transistor base, but the transistors are not allowing current through from the power source.

Nov 8, 2024 · In this post I have explained how to connect bipolar transistors in parallel using emitter resistor, and the right way to connect MOSFETs in parallel.

Add a 1N400x power diode in parallel with the collector and emitter of the transistor, pointing away from ground. The diode protects the transistor from back voltage generated when the motor shuts off, or if the motor is turned in the reverse direction.

Nov 10, 2019 · Learn how to use Bipolar Junction Transistors and MOSFETs to interface high-current DC loads with an Arduino.

Apr 23, 2022 · You can put transistors in parallel for more current capability. Works best with MOSFETs though. BJTs you need to add current balancing/ballast resistors in series with the emitter (~1ohm) which often isn't ideal.

Feb 6, 2023 · Learn how to control a DC motor with a transistor, using PWM. This article was revised on 2022/01/18 by Karl Söderby. Motors and transistors are very common electronic components. This article aims to provide some of the basics, along with a working code example, circuits and schematics.

Nov 17, 2024 · Transistors can be connected in parallel when two or more of them have the same pinouts and specifications. This increases the combined power handling capacity of the transistors. This article will teach you how to securely connect many transistors in parallel. We'll talk about both BJTs and MOSFETs.

For an application where you need to parallel transistors and control current in a linear fashion (not switching the transistors fully on and off), BJTs are your best bet. As Olin Lathrop says, the circuit will need to have resistors in series with the BJT emitters to help balance current.