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Also, if you need 10 or less push-buttons, you could use a CD decimal decoder in place of the CD, which has the advantage of being in a smaller package.

They seem similar in parts and complexity so I can’t readily say which is best. If you click through and buy from our affiliate partnerswe earn a small commission. You must log in or register to reply here. Articles Top Articles Search resources.

Best “radio button” latching circuit | Electronics Forum (Circuits, Projects and Microcontrollers)

Click on it to enlarge. Thread starter throbscottle Start date Jul 4, There shouldn’t be a race problem with the latch since the GS output delay is less than the decoded output delay and the latch latches on the falling edge of the clock [GS] input. Parts to look at include: Clock speed depends on expected worst case simultaneity.

Wed Feb 15, 2: I show five push-buttons but it can be expanded to eight. Well, I have plenty to work with now – massive thanks to both of you. I used TTL, though. You could also replace the switches with some digital inputs, hook up a bunch of oscillators and have it play by itself, this is afterall the lunetta section. Click here to register now.


When one key at a time was played, the result was “Unison. Hi, I’ve been looking to make a dead simple CV keyboard with keys that are etched like those you see in remotes: Media New media New comments Search media.

I haven’t had a chance to test either yet. You could add some pots datasheef the outputs like a baby 10 to make it into an adjustable CV keyboard. When a PB connected to the decoder output is depressed, the pulse from that output is used to latch the binary counter value of that PB position into the D-Flipflops.

Started by fastline Yesterday at 8: Display posts from previous: The 4-bit binary counter output goes to a CD 4-to decoder and to 4 D-Flipflops. For a better experience, please enable JavaScript in your browser before proceeding. Datassheet streaming at radio. Potentiometer Questions Started by norbss Yesterday at You need to expand that to the number of push-buttons you want. Daasheet, I had to try the priority encoder circuit also.

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CD datasheet & applicatoin notes – Datasheet Archive

Just saying hello Started by MichaelaJoy Yesterday at 6: Even better but credit where it’s due, it was ChrisP58’s idea to use a ccd4532 encoder, not mine! The generates 8 signals. Mon Apr 25, I didn’t have a model for that in my simulator Electronic Workbench so had to use the CD for the simulations. View unread posts View new posts in the last week Mark the topic unread:: I’m completely impressed and wish I’d had the idea myself – thank you!


CD4532BE IC 8-BIT PRIORITY ENCODR 16-DIP CD4532BE 4532 CD4532 CD4532B 4532B D4532

I just drew this up as part of a bigger circuit but it might come in handy for a lunetta controller. Priority Keyboard Subject description: Best “radio button” latching circuit.

Back in the day, I used priority encoders to interface with a key keyboard. To participate you need to register.

I designed a latching circuit to encode 16 momentary buttons to bcd, then I found another one on the internet. My version uses R-S flip-flops, creating a small delay to set each flip-flop after they have all been reset component values are fairly arbitrary at this stage and I haven’t given it a “zero” button, and missed out the switch symbols since LTSpice doesn’t have one The AND gate version I found latches using positive feedback, and is from here: Ccd4532 Feb 15, It’s shown below with a CD encoder and a CD 4-bit latch.

You might look at using a priority encoder as the front end. That on near simultaneous hits, the encoder will prefer the lower hit as first. Note that only four push-buttons are shown. Are these summed together to make a CV signal? Question is, which is best? Sep 05, Posts: Jun 01, Posts: It also comes with a bonus gate output which is high when any key is pressed. Moon Base Audio files: