Relays - Revision history

Studio Director at 01:45, 2 March 2026

2026-03-02T01:45:20Z

← Older revision		Revision as of 01:45, 2 March 2026
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	The circuit below uses an electromechanical (E/M) relay to switch between 5V and 9V operating voltages. It is unlikely you are going to need to switch between 5V and 9V in your designs, but the choice here, indicates the [https://en.wikipedia.org/wiki/Switch#Contact_terminology SPDT] functionality of a common E/M relay.		The circuit below uses an electromechanical (E/M) relay to switch between 5V and 9V operating voltages. It is unlikely you are going to need to switch between 5V and 9V in your designs, but the choice here, indicates the [https://en.wikipedia.org/wiki/Switch#Contact_terminology SPDT] functionality of a common E/M relay.

	We use a common 5V voltage regulator ([https://en.wikipedia.org/wiki/78xx 7805]) to drop the 9V of the battery to 5V, as required to operate the relay. A 2N2222 NPN transistor is doing the low-side switching to ~~activate~~ the relay using an Arduino Nano, with operating voltage 3.3V.		We use a common 5V voltage regulator ([https://en.wikipedia.org/wiki/78xx 7805]) to drop the 9V of the battery to 5V, as required to operate the relay. The 2N2222 NPN transistor is <!-- doing the low-side switching to --> activating the relay using an Arduino Nano, with operating voltage 3.3V.

	[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]		[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]

Studio Director: /* Activate a relay using 3.3V operating voltage microcontrollers */

2026-03-02T00:59:02Z

Activate a relay using 3.3V operating voltage microcontrollers

← Older revision		Revision as of 00:59, 2 March 2026
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	= Activate a relay using 3.3V operating voltage microcontrollers =		= Activate a relay using 3.3V operating voltage microcontrollers =

			The circuit below uses an electromechanical (E/M) relay to switch between 5V and 9V operating voltages. It is unlikely you are going to need to switch between 5V and 9V in your designs, but the choice here, indicates the [https://en.wikipedia.org/wiki/Switch#Contact_terminology SPDT] functionality of a common E/M relay.

			We use a common 5V voltage regulator ([https://en.wikipedia.org/wiki/78xx 7805]) to drop the 9V of the battery to 5V, as required to operate the relay. A 2N2222 NPN transistor is doing the low-side switching to activate the relay using an Arduino Nano, with operating voltage 3.3V.

	[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]		[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]

Studio Director: /* Links and components */

2026-03-02T00:52:30Z

Links and components

← Older revision		Revision as of 00:52, 2 March 2026
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	= Links and components =		= Links and components =
	- 5V reed relay '''SIL05-1A72-71D'''		- 5V reed relay '''SIL05-1A72-71D'''

			- Datasheet: https://docs.rs-online.com/82fc/0900766b8003309b.pdf

	- RS online: https://se.rs-online.com/web/p/tungelementrelaer/3492884P		- RS online: https://se.rs-online.com/web/p/tungelementrelaer/3492884P

Studio Director at 00:51, 2 March 2026

2026-03-02T00:51:38Z

← Older revision		Revision as of 00:51, 2 March 2026
Line 1:		Line 1:
	[https://en.wikipedia.org/wiki/Relay Relays] come into different types. We are mostly using electromechanical and reed relays in the Studio.		[https://en.wikipedia.org/wiki/Relay Relays] come into different types. We are mostly using electromechanical and reed relays in the Studio.

			= Links and components =
			- 5V reed relay '''SIL05-1A72-71D'''

			- RS online: https://se.rs-online.com/web/p/tungelementrelaer/3492884P

	= Activate a relay using 3.3V operating voltage microcontrollers =		= Activate a relay using 3.3V operating voltage microcontrollers =

	[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]		[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg\|thumb\|alt=5V relay activation using Arduino Nano (3.3V)\|5V relay activation using Arduino Nano (3.3V)]]

Studio Director: Created page with "[https://en.wikipedia.org/wiki/Relay Relays] come into different types. We are mostly using electromechanical and reed relays in the Studio. = Activate a relay using 3.3V operating voltage microcontrollers = 5V relay activation using Arduino Nano (3.3V)"

2026-03-02T00:50:02Z

Created page with "[https://en.wikipedia.org/wiki/Relay Relays] come into different types. We are mostly using electromechanical and reed relays in the Studio. = Activate a relay using 3.3V operating voltage microcontrollers = thumb|alt=5V relay activation using Arduino Nano (3.3V)|5V relay activation using Arduino Nano (3.3V)"

New page

[https://en.wikipedia.org/wiki/Relay Relays] come into different types. We are mostly using electromechanical and reed relays in the Studio.

= Activate a relay using 3.3V operating voltage microcontrollers =

[[File:3v-to-5v-or-9v-arduino-volt-reg-NPN bb.jpg|thumb|alt=5V relay activation using Arduino Nano (3.3V)|5V relay activation using Arduino Nano (3.3V)]]