| ??? 07/18/05 11:37 Modified: 07/18/05 11:43 Read: times |
#97546 - here is schematic Responding to: ???'s previous message |
hi kai it same schematic which i have posted before same circuit is troubling me again,any way here is link for schematic
http://www.8052.com/users/kuldeep/SCHEMATIC.pdf and follwing are the tests which i have done as suggested by Russell Bull. 1.if i remove feedback and put a potentiometer on input of adc to give virtual voltage feedback rather than actual feedback,there is still wrong EOC signal from adc means problem is not with feedback circuit. 2.as you can see in schematic a digital potentiometer 1804 is used to control output frequency of sg3524 pwm controller if i remove 3524 from circuit adc works fine. 3. the adc ground and 3524 ground both are common i should try it by isolating both the grounds in next board. from above results it seems that sg3524 is disturbing function of adc till than tell me what more should i take care while designing new board. |
| Topic | Author | Date |
| wrong EOC signal from ADC "strange" | 01/01/70 00:00 | |
| an adc | 01/01/70 00:00 | |
| an adc | 01/01/70 00:00 | |
| EOC | 01/01/70 00:00 | |
| EOC | 01/01/70 00:00 | |
| Feedback on feedback | 01/01/70 00:00 | |
| Feedback on feedback | 01/01/70 00:00 | |
| Weird effects | 01/01/70 00:00 | |
| Schematic? | 01/01/70 00:00 | |
| here is schematic | 01/01/70 00:00 | |
Mixed application needs proper grounding | 01/01/70 00:00 |