I'm reading Mim's Engineer's Notebook, it's a great vintage resource for novices. Seems like I can make the chirp with a 3909
Are Uf and Nf Capacitors? This would be my first time working with them. Also, do they go to ground at all? Sorry, I'm sure your schematic explains everything to trained eyes, but I'm still figuring things out. I might have questions for you as I design the circuit for the 555 (or 556), so thanks in advance!
For instance, can I follow your schematic but swap the (2) 555s for a (1) 556, or does a new schematic have to be drawn? Can all 555/556 chips output to one speaker since they will beep at different times, and only once?
Sorry for not being so active on this topic. Yes, you only need one circuit triggered by closing any of the switches.In the schematic Brian posted your inputs on the other end of the switches are ground.
as you have the simulation, can you show it over a longer time scale please, say up to 1 second to see that the beep (bottom waveform) stops after a few hundred mS.
It should beep once then stop if any of the switches are closed. These are the same switches that operate the row of digits.
1) Thanks for sharing the 555 schematic. Unfortunately, it’s just too confusing for my limited knowledge. I don’t think I’m capable of creating a circuit for it.
2) I linked a video below. The circuit in it uses less components and appears to do what I want. It was taken directly from Forrest Mimm’s book on 555 circuits. It’s not me in the video. Couldn’t this work if I replace the LED with a speaker and wire 12 switches to pin 2?
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