Timeline for Identifying an old RF circuit
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 31, 2018 at 21:41 | vote | accept | Félix Faisant | ||
| Jul 31, 2018 at 21:41 | |||||
| Jul 29, 2018 at 13:03 | comment | added | Andy aka | If the 22 uF had gone high impedance also, the phase shift oscillator would have no AC 0 volts hard reference so this would also cause failure. Old skool electrolytics were never really expected to last more than ten years! | |
| Jul 29, 2018 at 12:46 | comment | added | Félix Faisant | There is 0.2V across the 330Ω pull-up resistors, when power with 6V. So it seams fine ? I replaced a 22µF cap and the phase-shift oscillator works. I measured the leakage resistance of the old cap, and it is high enough. I have nothing to measure its capacity right now. | |
| Jul 29, 2018 at 10:48 | history | edited | Andy aka | CC BY-SA 4.0 |
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| Jul 28, 2018 at 21:16 | comment | added | Félix Faisant | Thanks. Given the size of the circuit, it's indeed probably radiating enough without an antenna. | |
| Jul 28, 2018 at 18:45 | history | edited | Andy aka | CC BY-SA 4.0 |
added 368 characters in body
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| Jul 28, 2018 at 18:37 | history | answered | Andy aka | CC BY-SA 4.0 |