Timeline for LM393N output doesn't behave as expected
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 21, 2016 at 12:09 | comment | added | nreath | I scoped the rail to see how much the voltage across the zener dipped when put under load, then simply changed the 40K resistor to a 60K, seems to have solved the problem. | |
| Jun 21, 2016 at 12:05 | vote | accept | nreath | ||
| Jun 21, 2016 at 6:56 | comment | added | Peter Smith | The choice of Schottky needs to be carefully done - the capacitor charging current is in the range of some devices reverse leakage current when warm. | |
| Jun 20, 2016 at 21:55 | comment | added | nreath | That's interesting, and definitely something I wouldn't have thought of. I've definitely seen the voltage dip, specifically when the MOSFET turns on. I'm no longer at work but I'll test your solution tomorrow and report back. | |
| Jun 20, 2016 at 21:50 | comment | added | John Birckhead | Just what I thought! | |
| Jun 20, 2016 at 21:49 | history | edited | John Birckhead | CC BY-SA 3.0 |
added 17 characters in body
|
| Jun 20, 2016 at 21:46 | comment | added | Transistor | Good point. The 5k current limiting resistor may cause the supply voltage to drop below that of the cap when under load. | |
| Jun 20, 2016 at 21:40 | history | answered | John Birckhead | CC BY-SA 3.0 |