This is the pcb board details of a Two Set Point Controllers for any process, shown here for temperature. For new types of transducers or input types, module card has to be designed or modified. The other cards remain the same.
The cabinet of these process controllers were made of steel for shielding, but the display [...]
Archive of entries posted on March 2009
Two Set Point – Display Card – Process Controller
Temperature Controller Main Card
This contains the Main card with a Power Supply and Relay Control. On this card is connected the Display ICL7107 – Temperature controller.
The Thermocouple and Control Modules can be plugged into this card, these change the type of control and type of inputs. This way this can be made into any parameter controller with any [...]
RTD Pt-100 Signal Conditioning Module
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
Display ICL7107 – Temperature controller
This is the Display Circuit and PCB part of of section Temperature Control.
The above circuit is powered by +5 and -5 from a LM7805 and LM7905 pair. If +/- 12V or +/- 7.5V is used in opamp or digital parts, then use below circuit for the DPM section.
The PCB for above
TC Display Copper Side
TC Display [...]
Analog Mux for Data Acquisition Systems
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 [...]
Multiplexed Presettable Timer with ICM7217
This was a attempt to make a Sequential Timer with ICM7217 of Intersil, even though it worked well, it was not developed beyond the prototype stage or first iteration. Only when a product is made in some numbers, the documentation and designs become clear, streamlined and seasoned.
The PCB and Circuit are not complete. It may [...]
