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After a few iterations on the simulator I came up with the design below.
Please support our site. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Wed Feb 15, Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.
It also comes with a bonus gate output which is high when any key is pressed. Started by fastline Yesterday at 8: They seem similar in parts and complexity so I can’t readily say which is best.
Clock speed depends on expected worst case simultaneity.
The simulator allowed me to find that out before its built. Mon Apr 25, To go to sixteen you need to use the circuit shown in Figure 15 of the CD data sheet for a input encoder.
CD4532 – CD4532 8-Bit Priority Encoder
The clock signal from the astable causes the CD binary counter to continually cycle through its 16 states. Click here to register now. Media New media New comments Search media. So take your pick. 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.
Even better but credit where it’s due, it was ChrisP58’s idea to use a priority encoder, not mine! Parts to look at include: Ok, I had to try the priority encoder circuit also. 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.
OlPhart Member Jul 7, To participate you need to register. I just drew this up as part of a bigger circuit but it might come in handy for a lunetta controller. 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.
Thread starter throbscottle Start date Jul 4, Well, I have plenty to work with now – massive thanks to both of you. That on near ratasheet hits, the encoder will prefer the lower hit as first. Wed Apr 27, 5: Just saying hello Started by MichaelaJoy Yesterday at 6: You could add some pots to the outputs like a baby 10 to make it into an adjustable CV keyboard.
You need to expand that to the number of push-buttons you want. You could also replace the switches with some digital adtasheet, hook up a bunch of oscillators and have it play by itself, this is afterall the lunetta section. I designed a latching circuit to encode 16 momentary buttons to bcd, then I found another one on the internet. I didn’t have a model for that in my simulator Electronic Workbench so had to use the CD for the simulations.
(Datasheet) CDB pdf – CMOS 8-Bit Priority Encoder (1-page)
I haven’t had a chance to test either yet. Note that only four push-buttons are shown. The bits of the 2nd encoder had to be inverted. Sep 05, Posts: Display posts from previous: Thanks for this – I’d looked at de multiplexers briefly, based on what’s in my junk box, which ain’t much but the thing that stumbled me was the need to latch the output. The schematic for the mofos mini controller just has a singular cv output.
I show five push-buttons but it can be expanded to eight. Best “radio button” latching circuit.