Timeline for Bats ultrasounds detector with LM324
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 31, 2023 at 16:58 | comment | added | Andy aka | @Gos I see that glen_geek recommended a device that can do demodulation well, I think you can buy a spin-off version of that chip which supports a colpitts oscillator. It's definitel an SAxxx device maybe SA620 from NXP. | |
| Jul 31, 2023 at 16:04 | comment | added | Gos | Anyway I will continue and try to make it work properly, just for learning and fun. I find the project nice and interesting. I will try the different changes suggested here. Soon I'll get a basic signal generator, that will help to test I hope. Thanks! | |
| Jul 31, 2023 at 16:00 | comment | added | Gos | Yes. Actually I saw the comment of someone asking about adding or multiplying and the response. Now I know that it can't work, or at least can't work by the expected reasons. | |
| Jul 31, 2023 at 12:36 | comment | added | Andy aka | The comments are quite revealing. I didn't find any that had successfully made the project and the project owner's thoughts about mixing are utter pants. Always read the feedback comments. | |
| Jul 31, 2023 at 12:15 | comment | added | Gos | community.element14.com/challenges-projects/element14-presents/… | |
| Jul 31, 2023 at 12:00 | comment | added | Andy aka | Please link the page that describes how it works and where user comments can be found. | |
| Jul 31, 2023 at 11:13 | comment | added | Gos | This is the original project schematic. I don't know if I can/should put links here: community-storage.element14.com/… | |
| Jul 30, 2023 at 15:22 | comment | added | Andy aka | I have no idea about the original design because I cannot access it. | |
| Jul 30, 2023 at 13:26 | vote | accept | Gos | ||
| Jul 30, 2023 at 13:25 | comment | added | Gos | In the original design is doing the same, with small differences in the resistors values. Could be that it works only partially and because some frequencies end by chance in the lower range producing the clicks? | |
| Jul 30, 2023 at 13:12 | comment | added | Andy aka | @Gos that's the sort of device that should work better but, if the original design (that you base your circuit on) uses something else then why not use that. If we are done here, please take note of this: What should I do when someone answers my question. If you are still confused about something then leave a comment to request further clarification. | |
| Jul 30, 2023 at 13:09 | comment | added | Gos | For the mixer something like the AD633 would be fine? Just from a quick google search, I haven't look at the details yet. And about the PCB, yes, there could be still problems. Actually it's a nightmare to work with the breadbroad. I have spent a lot of time checking the connections, you are never sure that all contacts are working, specially for resistors. | |
| Jul 30, 2023 at 13:07 | history | edited | Andy aka | CC BY-SA 4.0 |
added 204 characters in body
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| Jul 30, 2023 at 12:58 | comment | added | Gos | Ok, I can change the mixer. Checking about it I think that you are rigth, it should be a multiplier. About the harmonics of course you are right, I didn't realize. You need a lot basic waves to produce a square or triangle signal. | |
| Jul 30, 2023 at 11:58 | history | answered | Andy aka | CC BY-SA 4.0 |