Analog Mux for Data Acquisition Systems

 Industrial-Automation  No Responses »
May 092009
 

Here is a 4-20 mA In/Out Analog Mux with Cascade option. This is a simple circuit i designed to make a Automation System within a budget.

This takes 4-20mA from many Transmitters and gives out just one 4-20 mA output. The Mux is done with a digital byte or word. This is a slow scanner as process is slow, that way many analog inputs can be multiplexed and sent into one analog input of a D/A. In near real time systems a faster mux could be used or mux totally avoided. This was made in some numbers, so the pcb is better than others.

4-20mA Multiplexer Circuit – pdf

 Posted by admin at 8:17 AM

100kHz Half Bridge Convertor – SG3525

 Power-Supplies  No Responses »
May 012009
 
100kHz Half Bridge Convertor - SG3525

This is a SMPS Circuit application very close to the Application Note in the book SGS Motion Control Application Manual. This worked well. Read about SG2525 – SG3525 – PWM SMPS Regulator Chip. Some Notes Related to the Project In main circuit do not link different grounds. Main circuit can be used both for 110 AC and 230 AC Ferrites are partial conductors use proper insulation before winding. For main transformer TRX2 use split bobbin for good/safe isolation. Epoxy coated toroids have to be further insulated before winding. Line of isolation between primary and secondary circuits should be explicit. Primary Read More …

 Posted by admin at 12:31 PM  Tagged with:

RTD Pt-100 Signal Conditioning Module

 Temperature-Controller  No Responses »
May 012009
 

This is the RTD Signal Amplifier part of Temperature Controller or Indicator. The card also contains a relay on-off control circuit. The Circuits are – RTD and V/I Module Propotional Output RTD and Control Module ON-OFF The PCB Boards – RTD Module Copper RTD Module Solder Mask RTD Module Silk Screen RTD Module Drill Template

 Posted by admin at 7:55 AM  Tagged with:
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