Relay Coil Controlled by NPN

An interactive diode, transistor, LED and resistor circuit built in the DCACLab online simulator by Haridass Puthussery Mani.

Preview of Relay Coil Controlled by NPN

Open in the lab Embed The simulation runs as a demo that pauses after two minutes; open it in the lab to keep going.

What's inside

2× Battery
5× Resistor (10 kΩ, 100 kΩ, 330 Ω)
1× LED
2× Diode
2× Transistor
2× Switch
2× Relay

Tags

Battery Diode Switch Relay Transistor Resistor LED

About

By Haridass Puthussery Mani
Saved June 17, 2026 · updated June 19, 2026
619 views
Page: dcaclab.com/circuits/87052-relay-coil-controlled-by-npn

Embed this circuit

<iframe src="https://dcaclab.com/experiments/87052-relay-coil-controlled-by-npn/iframe" width="560" height="410" frameborder="0"></iframe>

Cite: Puthussery Mani, H. (2026). Relay Coil Controlled by NPN. DCACLab. https://dcaclab.com/circuits/87052-relay-coil-controlled-by-npn

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