Timeline for trouble amplifying signal from a blood pulse sensor using an LDR
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 28, 2014 at 8:27 | comment | added | user32885 | Very general advice - follow the signal through each stage and see where things go wrong. | |
| Jun 28, 2014 at 4:09 | answer | added | waltx | timeline score: 3 | |
| May 21, 2014 at 21:34 | comment | added | WhatRoughBeast | Also, from the picture of your setup, it looks as though you are using electrolytic caps for your filters. These do not work well with AC. Replace them with non-polarized caps (ceramic ought to work OK for this application.) | |
| May 21, 2014 at 13:50 | comment | added | Andy aka | Also, in case that isn't the only problem can you show the full circuit diagram with power rails to the op-amps and decoupling caps on the op-amp power rails. No short-changing! | |
| May 21, 2014 at 11:55 | comment | added | user1393689 | oh ok, will try that! was having similar issues when using a single sided supply also. | |
| May 21, 2014 at 11:15 | comment | added | Tut | Are you trying to use +- appx 6V dual supplies? Don't you need to connect "+" from the negative supply to "-" of the positive supply for your DC common? | |
| May 21, 2014 at 9:21 | history | asked | user1393689 | CC BY-SA 3.0 |