Read: 610 times
|#113313 - Reply : Chopper Schematic|
Responding to: Kai Klaas's previous message
Having gone through the circuit i could arrive at the following description.
Recalling the circuit here,
The LM324 (with o/p Usig) forms the differential amplifier.
The rest of LM324's connects to form an instrumentation amplifier of gain 1, 10, 100 to amplify the drop accross the Reed Switch contact(RCont).
But this is very general and hence to have a detailed analysis i would require the following details:
i could not understand why i should toggle BC337 every 900uSec.
And the equation given to calculate the CR is not clear to me. can i get some details on that?
Mainly, it would be of much help to me to work with the values you have selected for the components, and
thus compare its performance with my application if you could describe 'how the circuit operates'.
Since, this could make me also to know about the issues that should be concentrated in the intended design and thereby knowing the steps that should be adopted to overcome it!
Requiring your assistance
|Measuring CR of Reed Switches.||Suresh R||03/22/06 05:24|
|Contact resistance?||Oliver Sedlacek||03/22/06 06:41|
|Correction : Sorry its 10mV to 2500mV||Suresh R||03/22/06 08:17|
|Voltage or current, pick one||Oliver Sedlacek||03/23/06 02:12|
|I can choose Test current as 10mA||Suresh R||03/23/06 03:09|
|typical constact resistance ?||Steve M. Taylor||03/23/06 05:38|
|yes, but||Erik Malund||03/23/06 06:52|
|No CR when closed?||Suresh R||03/23/06 09:46|
|If this was possible, you would not need||Erik Malund||03/23/06 10:37|
|current source with series resistor at||Suresh R||03/23/06 11:22|
|Yes||Erik Malund||03/23/06 11:48|
|constant current source||Terry Lingle||03/23/06 13:18|
|V=IR||Neil Kurzman||03/23/06 15:10|
|Specs & Description||Suresh R||03/24/06 04:47|
|resistor ?||Steve M. Taylor||03/24/06 01:45|
|Current source circuit for CR measuremen||Suresh R||03/24/06 10:06|
|Why not using...||Kai Klaas||03/24/06 10:35|
|Kind of||Neil Kurzman||03/24/06 18:06|
|And...||Kai Klaas||03/24/06 20:38|
|7805 and get 10mA and 100mA||Suresh R||03/25/06 04:48|
|reply - thermo-potentials||Suresh R||03/26/06 03:39|
|since you work for the manufacturer||Erik Malund||03/26/06 10:50|
|Chopper||Kai Klaas||03/26/06 20:04|
|Chopper schematic||Kai Klaas||03/27/06 05:58|
|Thanks very much Kai.||Suresh R||03/27/06 10:35|
|Reply : Chopper Schematic||Suresh R||03/28/06 11:36|
|Answers||Kai Klaas||03/28/06 19:58|
|what about a chopper stabilized op-amp?||Erik Malund||03/29/06 06:14|
|Yur.||Steve M. Taylor||03/29/06 07:22|
|Yes, but...||Kai Klaas||03/29/06 08:36|
|AC components , VCR, DCR||Suresh R||03/29/06 11:59|
|Answers||Kai Klaas||03/29/06 20:18|
|Demodulation?||Oliver Sedlacek||03/30/06 01:06|
|This would be the Lock-in scheme||Kai Klaas||03/30/06 05:35|
|Average Value, VCR & DCR Calculation||Suresh R||03/30/06 05:30|
|Quite simple||Kai Klaas||03/30/06 05:45|
|Analysis for Usig o/p||Suresh R||03/30/06 11:56|
|Answers||Kai Klaas||03/30/06 20:33|
|I thank you very much Kai||Suresh R||03/31/06 04:48|
|Test Condition: 10mA, 50mV||Suresh R||04/19/06 10:06|
|Switching condition||Kai Klaas||04/19/06 10:14|
|Remember Ohm's law?||Richard Erlacher||03/23/06 12:50|