ON-ON switch vs ON-NONE-ON - Page 1
Forum section: electronics / beginners

author: Back2Volts
author_rank: Unknown
timestamp: January 01, 2017, 04:06:15 pm
content: Are they the same or does the NONE imply a middle stop position where no connections are made ?

author: xani
author_rank: Frequent Contributor
timestamp: January 01, 2017, 04:12:46 pm
content: http://www.carlingtech.com/basic-circuit-function#10Seems like what you want would be ON-OFF-ON. If in doubt, look in the datasheet

author: rstofer
author_rank: Super Contributor
timestamp: January 01, 2017, 04:22:31 pm
content: Corrected my oopsie! It's too early in the day...ON-NONE-ON has 2 positions - there is no center positionON-OFF-ON has 3 positionsThere are some ON-ON-ON switches around but they're not common.

author: Back2Volts
author_rank: Unknown
timestamp: January 01, 2017, 05:12:39 pm
content: Quote from: rstofer on January 01, 2017, 04:22:31 pmNot according to the Carling document posted by xani:ON-NONE-ONThe ON-NONE-ON or ON-ON circuit is a maintained, double throw, two-position switch circuit. In general, for basic unlighted single pole switches, ON positions close at the circuit at switch terminals 1 & 2 and 2 & 3. For basic unlighted double pole switches, the circuit is closed at terminals 1 & 2 and 2 & 3; 4 & 5 and 5 & 6.If the switch is mounted vertically, you would press the top of a rocker actuator or push a toggle actuator upward to set the switch to the first ON position. You would press the bottom of the rocker or move a toggle downward to set the switch to the second ON position. This switch circuit does not have an OFF position, where all switching circuits would be open.

author: rstofer
author_rank: Super Contributor
timestamp: January 01, 2017, 05:14:52 pm
content: Quote from: Back2Volts on January 01, 2017, 05:12:39 pmYou are correct. ON-OFF-ON is the 3 position variant.

author: retrolefty
author_rank: Super Contributor
timestamp: January 01, 2017, 11:02:44 pm
content: Quote from: Back2Volts on January 01, 2017, 04:06:15 pmIt is indeed a 3 possible position switch. Some on-none-on switches can be had with a momentary spring return on either on or just one of the on positions.

author: Back2Volts
author_rank: Unknown
timestamp: January 01, 2017, 11:20:21 pm
content: Quote from: retrolefty on January 01, 2017, 11:02:44 pmAre you saying that the Carling description is wrong ?

author: retrolefty
author_rank: Super Contributor
timestamp: January 02, 2017, 02:14:47 am
content: Quote from: Back2Volts on January 01, 2017, 11:20:21 pmI guess I could be wrong according to Carling (which I've never heard of). I just never heard of a simple on/off switch referred to as on/none/off. I guess the problem is that a given switch has both an electrical description (spst,spdt,dpdt,etc) and a mechanical description (toggle, momentary, center off, etc.After a few misordered switches in the 70s I alway try and find a datasheet for any specific switch and if not available then pass on it. Pots can be just as error prone to order for all the various types (taper, gangs, detented, etc) Some stereo volume/balance pots from the 70s can be near impossible to source anymore.

author: John Coloccia
author_rank: Super Contributor
timestamp: January 02, 2017, 02:38:51 am
content: I think the On-On and On-None-On thing comes about because engineers love spreadsheets and it's awkward to leave the "center" column blank on the spreadsheet...so you say "None" instead, and all is right with the world.

author: Psi
author_rank: Super Contributor
timestamp: January 02, 2017, 02:55:44 am
content: be away that some On-On-On 3 position switches have 6 terminals and you have to short some pairs to "make" a 3-way switch. While others have 8 terminals and work as you would expect.