Timeline for How does this metal detector circuit work with an AM receiver?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Apr 2 at 12:31 | vote | accept | Maro2058 | ||
| Jan 8 at 11:50 | review | Close votes | |||
| Jan 8 at 17:20 | |||||
| Jan 7 at 18:48 | answer | added | Transistor | timeline score: 0 | |
| Jan 7 at 18:19 | answer | added | Kuba hasn't forgotten Monica | timeline score: 1 | |
| Jan 7 at 18:11 | comment | added | glen_geek | This may be a squeeging oscillator which self-modulates. Also called super-regeneration. An AM radio detects the rate at which RF oscillations start and stop. Ground proximity affects the regeneration rate, hence the audio pitch changes. A guess, so not an answer. It is a tricky circuit to get working properly. | |
| Jan 7 at 17:55 | history | edited | JRE | CC BY-SA 4.0 |
added 3 characters in body
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| Jan 7 at 17:46 | history | edited | Maro2058 | CC BY-SA 4.0 |
added 70 characters in body
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| Jan 7 at 17:44 | comment | added | Dave Tweed | In order to hear a beat frequency, you would have to tune this circuit so that its frequency is close to the frequency of a strong local radio station. Your AM receiver also needs to be tuned to this station. Then, as metal affects this oscillator's frequency, you'll hear the beat frequency change. | |
| Jan 7 at 17:42 | history | edited | JRE | CC BY-SA 4.0 |
edited body; edited title
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| S Jan 7 at 17:36 | review | First questions | |||
| Jan 7 at 17:48 | |||||
| S Jan 7 at 17:36 | history | asked | Maro2058 | CC BY-SA 4.0 |