| General > General Technical Chat |
| Searching for the chip that produces this tone |
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| nocamig429:
Amazing o-O Thinking about it, it might have something to do with the quartz oscilator on the clock, since you probably can get 2048hz from 32768hz easily. Now I can surely generate it by hand, thank you so much! I'm still researching on the topic, since this became a really weird rabbit hole, I sent some e-mails to Hoseki, since they seem to have a lot of patents related to clocks and circuits, but I can't understand most of them cause they are in Japanese. I'm now wondering on who did this first, I doubt I'll easily find it, but its fun kinda. |
| soldar:
Exactly. 32768 is 2^15 so you just use a chain of 15 counter/dividers to get 1 Hz which is what moves the clockwork. From the same chain of counters you can extract the beeps as shown above. To the AND gate you can add another input to enable/disable the alarm sound. Interestingly I do not see a 15 stage binary counter chip, only the 74HC4020 which is 14 stage and would produce a 2 Hz output with a 32768 Hz input. |
| themadhippy:
hows about a 4060 divider chain and oscillator all in one |
| soldar:
4060 includes the oscillator but is still only 14 stage counter which would output 2 Hz with a 32768 Hz oscillator. |
| pcprogrammer:
Or an ATtiny that can easily do it without any other components apart from maybe a decoupling cap and a rc filter to make the sound a bit nicer than harsh square waves. |
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