Timeline for Why my RC-oscillator design does not produce any output?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 14 at 13:22 | vote | accept | ScienceDiscoverer | ||
| Jul 14 at 3:48 | answer | added | periblepsis | timeline score: 4 | |
| Jul 13 at 19:33 | comment | added | 比尔盖子 | It's the iron law of electronics: amplifiers always oscillates but oscillators do not. Some trial and error is to be expected. | |
| Jul 13 at 16:46 | answer | added | glen_geek | timeline score: 1 | |
| Jul 13 at 16:21 | review | Close votes | |||
| Jul 14 at 4:24 | |||||
| Jul 13 at 15:57 | comment | added | glen_geek | One of the difficulties with RC sinewave oscillators involves gain: too little gives no oscillation while too much causes a distorted sine wave (clipped). You want to aim for gain very close to the critical value where oscillation just barely begins. Then you want to ensure that oscillations don't die out at temperature extremes and at various supply voltages and under all expected loading conditions. In a LTspice simulation, this one is close, but a bit too little gain. | |
| Jul 13 at 15:32 | comment | added | G36 | Try to reduce the R6 value to 470 or more and see what you get. | |
| Jul 13 at 15:26 | comment | added | Marcus Müller | and when you plug this schematic into a simulator, will it oscillate? You already seem to have in kicad, you can launch spice simulations directly from kicad (it's not very pretty), or use falstad to recreate your circuit online | |
| Jul 13 at 15:24 | comment | added | Marcus Müller | out of curiosity: where does the >29 come from? I can't find a reason for that | |
| Jul 13 at 15:14 | history | asked | ScienceDiscoverer | CC BY-SA 4.0 |