Sourcing Cassette Style Buttons (But I don't know what they're called) - Page 1
Forum section: electronics / beginners

author: devinatkin
author_rank: Contributor
timestamp: August 07, 2022, 03:43:18 pm
content: I'm sorry I don't know the proper name, which is probably why I can't find anything related to them. I'm trying to find a source for those buttons where you press one in and the others pop up. I'm repairing an old radio which has them and am currently considering the option of just gutting everything in the radio (The thing just emits the screams of hell currently). But in order to do that I'd need to replace the front panel of buttons which were originally for selecting between frequency ranges.The plan is to use a raspberry pi (Yes I somehow sourced one of them) Then wire it up and write some scripts so that the buttons and knobs control spotify instead of a real radio. But I need those style buttons in order to make this plan work.I've searched around and the terms I'm using keep giving me piano key buttons which aren't what I want. Does anyone still make those buttons? Or will I need to go with ones that press down and up, but don't have any sort of mechanism so only one can be pressed at a time.

author: Benta
author_rank: Super Contributor
timestamp: August 07, 2022, 03:53:22 pm
content: i think you're looking for something like the C&K F-Series of pushbutton switches (originally ITT-Schadow).It's a Lego-like system where you build the whole thing yourself from rails, switches, release rails etc.https://www.ckswitches.com/products/switches/product-details/Pushbutton/F/

author: ebastler
author_rank: Super Contributor
timestamp: August 07, 2022, 04:28:45 pm
content: The C&K switches Benta has linked to may or may not be able to provide what you are looking for. But you will probably struggle to buy the right custom configurations in small quantities. Such interlocked/ganged switches are very uncommon as off-the-shelf parts. I think the audio devices which use(d) them -- radios, cassette recorders etc. -- would typically contain custom-made switch groups and mechanisms.The common solution today is to emulate the "radio button" functionality in software, and with LED indicators instead of the physically latched switches: Use momentary switches with built-in LEDs; then let your microcontroller or Raspberry Pi enable the LED on the most recently pressed switch only, and disable whichever other LED was on before.EDIT: Alternatively, if the mechanism in your radio still works: Can you retain either the mechanism + switch contacts, or just the mechanism and put new push-button switches behind it? The interlocking mechanism is what's hard to come by; the switch contacts should be pretty standard.

author: ledtester
author_rank: Super Contributor
timestamp: August 07, 2022, 05:24:26 pm
content: I've seen these kinds of switches in my local surplus store:https://www.surplussales.com/switches/swpushb-2.htmlhttps://www.westfloridacomponents.com/SW098APD/5+Position+Push+Button+Gang+Switch.htmlhttps://www.surplusgizmos.com/Comax-6-Gang-Push-Button-Switch-25v-DC-1-Amp_p_2514.htmlI think they can be configured to be ganged or independent.

author: Benta
author_rank: Super Contributor
timestamp: August 07, 2022, 05:55:33 pm
content: Quote from: ebastler on August 07, 2022, 04:28:45 pmThis is where you're completely wrong. The F-Series can be configured by yourself in single-unit quantities. Thus my "Lego" remark.Example:I want an array with one push-on/push-off switch, two mutually exclusive switches and three mutually exclusive switches (aka "radio buttons").So, I order a mount rail for 6 switches, one push-on/push-off switch and five momentary switches.Add to that a two-position and a three position release rail and two springs for those.Lastly, six buttons according to taste/style.Building the switch array is easy. Lego, like I said.

author: ebastler
author_rank: Super Contributor
timestamp: August 07, 2022, 06:46:15 pm
content: Quote from: Benta on August 07, 2022, 05:55:33 pmThis is where you sound a bit impolite.Good to know that these switches are modular and configurable. I see all the configuration options in the datasheet, but not e.g. in the Mouser catalog. Can't find the rails at Mouser either, but that is probably since I don't know what to seach for. Where would you order these in small quantities?

author: Benta
author_rank: Super Contributor
timestamp: August 07, 2022, 07:25:27 pm
content: Quote from: ebastler on August 07, 2022, 06:46:15 pmDidn't mean to be, sorry. But I think it's a bit sad to discourage people up front.It's been around ten years since I last used the F-Series, so where to source them today? I don't know. Farnell or Digikey perhaps?The C&K/ITT-Schadow F-Series are the most versatile pushbutton switches I know of, and there are even more tricks for modifying/combining them. I've worked with them extensively over the years.

author: IanB
author_rank: Super Contributor
timestamp: August 07, 2022, 07:34:22 pm
content: Quote from: devinatkin on August 07, 2022, 03:43:18 pmMaybe I'm missing something, but if you gut the radio, can't you re-purpose the existing switches somehow? (Maybe you could arrange them to operate microswitches instead of the original mechanical arrangements?)

author: rooppoorali
author_rank: Regular Contributor
timestamp: August 12, 2022, 11:12:16 am
content: Do you have any picture?

author: devinatkin
author_rank: Contributor
timestamp: August 12, 2022, 02:44:56 pm
content: These look perfect to act as replacements. Thank you for the help

author: tooki
author_rank: Super Contributor
timestamp: August 12, 2022, 03:55:58 pm
content: Quote from: devinatkin on August 07, 2022, 03:43:18 pmFWIW, in software user interface design, this is the reason the widget for mutually-exclusive options is called “radio buttons”.

author: SL4P
author_rank: Super Contributor
timestamp: August 12, 2022, 04:57:03 pm
content: Just to address the original question, try searching for “piano key switch”The various result subsets might find what you’re looking for.

author: Terry Bites
author_rank: Super Contributor
timestamp: August 19, 2022, 12:35:41 pm
content: This sort of thing?https://www.ebay.co.uk/itm/223459594991https://www.surplussales.com/switches/swpushb-2.html