dapj Diagrams

Mains Voltage Stabilizer Circuits

2009-06-08T12:47:00.000+05:30

Mains Voltage Stabilizer Circuits These circuits were drawn for a person in Africa. See the thread here... stabilizer circuit. They were not tested by me, but are quite close to a practical design. Stabilizer Step up 230V AC 500VA This circuit is a design i did, not tested by me as yet. It can Stabilize Mains voltage to around +/- 10% . It can be used for both 110V AC or 220V AC inputs with modifications. The Output is 220V AC. There is an overload, under voltage and over voltage trip...

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Flow Measurement and Control

2009-06-01T13:20:00.000+05:30

There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. 1. Set Point. (SP) This is the Flow Rate at which you require the Fluid to be controlled at. Adjust the rate at which the fluid flow is expected to be controlled . 2. Process Value. (PV) This is the Actual Flow Rate of the fluid in the flow sensor or...

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Multiplexed Presettable Timer with ICM7217

2009-06-01T11:01:00.000+05:30

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 give ideas. During this time, as far as i can remember, these were the only large CMOS devices. 8080-85 and Z80 devices consumed lot of power and needed big boards and...

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Analog Mux for Data Acquisition Systems

2009-05-09T07:47:00.000+05:30

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...

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100kHz Half Bridge Convertor - SG3525

2009-05-01T12:01:00.000+05:30

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...

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RTD Pt-100 Signal Conditioning Module

2009-05-01T07:25:00.000+05:30

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 This post was created by dapj Web

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Two Set Point - Display Card - Process Controller

2009-04-01T08:42:00.000+05:30

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 card would still pickup EMI in some cases. These were more in instances where the Instrument supply was derived from the motor 3-phase supply. Instrumentation Supplies 230V AC...

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Proportional Module for Process Controller

2009-04-01T07:23:00.000+05:30

When you need a proportional control output, either 4-20mA or Time Proportional On-Off, This module is used. It does a slow PWM control, the cycle time for SSR or Thyristor Banks can be closer to Mains Frequency. The 4-20mA can be used to drive motors for turning valves for fuel or fluid heat control. Schematics of Module Proportional Control Card Two Set Point Card Proportional Control Card 4-20 mA Board of Module Proportional Module Copper Proportional Module Solder Mask Proportional...

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Thermocouple and Current Input Module

2009-04-01T05:35:00.000+05:30

This module converts J, K Thermocouple and 4-20 mA Inputs to 0-2V Full Scale. These can be used for any voltage input too. The RTD module can be modified more easily for Voltage inputs. The control output can be On-Off or 4-20 mA/Proportional with another card. The 4-20mA I/O STC1000I is not complete. Schematics of Modules J and K TC Module J-K Proportional Type 4-20mA In-Out Module Board of Module JK-I Module Copper JK-I Module Solder Mask JK-I Module Silk Screen JK-I Module Drill...

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Temperature Controller Main Card

2009-03-10T13:01:00.000+05:30

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 type of input and output. But it is all set in production, not configurable at site. So even if you make a 4-20mA output Flow Controller with this, the Main card and...

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Display ICL7107 - Temperature controller

2009-03-10T09:20:00.000+05:30

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 Silk Screen TC Display Solder Mask TC Display Drill Template The PDF Circuit for above Display Card STC1000This post was created by dapj Web

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Millivolt Source with Digital Potentiometer

2009-03-01T09:40:00.000+05:30

Here is a Millivolt Source i built for Calibration in the early days. It uses only CMOS Digital and Mixed Chips from Intersil and CD40xx Series. Later i tried a unit with 8748 part of the code in my uC section. This is with Ramp-up and Ramp-down using only two buttons. This works even now, The support below is an HRC Fuse Holder made of Phenolic or Epoxy Resin. The mV Terminations are on Top.This post was created by dapj Web

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Three Point Preset Counter

2009-02-12T12:30:00.000+05:30

This is a prototype of a Preset Counter. It is built with ICM7217. The cabinet is ABS Plastic DIN 96-96. The Panel is Engraved on Acrylic. I don't remember for which application it was used. It has three thumbwheel settings, when the proximity switch counts upto the set-value, the corresponding relay turns ON, with a State Indicating LED on front panel. These can be configured sequentially or to work synchronously, this depends on what customer wants. Both modes may give the same result. In...

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Proportional Temperature Controller

2009-02-11T14:30:00.000+05:30

Proportional Temperature Controller This is a Proportional Controller where the setpoint is derived from a Thumbwheel switch. The conversion of Thumb-wheel Digital Data to Analog mV is similar to R-2R Weighted Resistor Network. In this case it is a 1-2-4-8 Binary Weighted Resistor Network. It has no Digital Components. You can see an example circuit below for digit weights you just use like 10K-100K-1M etc. There is a problem of procuring 8M Resistors, so use series parallel combinations,...

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Proportional Process Controller

2009-02-11T09:46:00.000+05:30

Proportional Process Controller Specifications Front Panel Controls Display - Process Value PV This is a 3 1/2 digit display which shows the process value from 000 to 1999 as chosen by user it could be deg C, Kg/cm2 or Lts/hr. Push Switch - Displays Setpoint This is a push switch which when pressed, makes Display read SetPoint as required by user to control his process. On-Output Status LED Indicates Relay ON or OFF in Relay and Pulse Output Units. Units with 0-10V or...

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Blind Dial Analog Temperature Controller

2009-01-05T11:15:00.000+05:30

This is a Low cost controller, Analog Dial Temperature Controller. It is also called Blind Controller. This essentially means Open Loop, just control the fuel or energy input to the system to regulate heat. This is not a Blind Controller that way, it only cannot display the temperature value, that could be another reason it is called blind. Dial cyclic timers were used to control heat, these were purely mechanical clockwork devices. They could regulate well, when the material flow (liquid) is...

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Regulated DC Power Supply Catalog

2009-01-04T07:04:00.000+05:30

Here is the catalog i made many years back to promote the DC Power supply i manufactured. See - DC Regulated Power-Supply Front Side From dapj Diagrams Back Side From dapj Diagrams This post was created by dapj Web

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RTD 3-W Mains Power 4-20 mA Transmitter

2009-01-02T19:00:00.000+05:30

This is the Photo of a RTD 3-W Mains Powered Temperature 4-20mA Transmitter. The Circuits and PCB are here RTD PT100 Transmitter and Multiplexer. From dapj Diagrams Now with new Technologies like Zigbee and Modbus, We can classify Transmitters as shown below. The Measured Parameter Temperature, Flow or Events Has to reach an Intelligent Data Storage and Analysis System. It may just be an Human Operator who jots the data on a Notepad and Turns a Few Dials based on his Experience or an...

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Single Set Point Temperature Controller

2008-12-18T21:23:00.000+05:30

This is a generic or standard controller for any type of process. Shown here is a temperature controller. The STC1000 could be used for Ovens or furnaces, liquid baths, heating or environment chambers. It has a single analog input and an analog or relay output. Analog inputs could be like 4-20 mA, thermocouple or RTD. Analog outputs can be 0-10 V for a thyristor drive, SSR drive output or potential free contacts of a relay to operate external 3 phase contacters. The closed loop control could...

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Capacitor Temperature Monitor

2008-12-13T14:20:00.000+05:30

When placing sensors in high pressure or vacuum chamber, they should be terminated by an epoxy sealed terminal block interface on the system. 4 wire RTD is best for such applications, as multiple terminations and junctions are involved; also the wires may have to run some distance. When measuring temperature in a big surface or object, use multiple sensors. An indicating scanner-controller can be used or ensure cooling-heating is uniform using fluids or air circulation. Zoom...

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Pressure Measurement and Control

2008-12-13T07:41:00.000+05:30

Pressure is the next most important parameter after Temperature. In Hydraulics and Pneumatics, the measurement, indication, control and logging-charting of pressure is indispensable. Popular Pressure Sensors are based on either Piezoresistive or Strain-Gauge Technologies. Strain-Gauge types can be Metal Foil or Semiconductor Film. The Analog Strip Chart Recorder is used in Simple Systems where a Record or Report has to be generated. Data Loggers and PC based Data Acquisition Systems expand...

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Two Stage Sequential Timer Docs

2008-11-11T03:54:00.000+05:30

Design Documents Discussion of Sequential Timer - A Discussion of Sequential Timer - B Sequential Timer Specs. Two Stage Sequential Timer. Li-Ion Battery Charger. Source Files Orcad Format Two Stage Sequential Timer - 90004.zip Li-Ion Battery Charger - 90005.zip Block Diagram : Zoom Image Resources : Digi-Key Electronic Components Distribution Circuit Innovations electronics design, PCB manufacturing Jameco Electronic components distributor Ledex - Solenoid DC AC tubular...

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Four Channel Temperature Alarm Docs

2008-11-10T10:01:00.000+05:30

Design Documents Discussion of four Channel Alarm. Four Channel Temperature Alarm. RTD Pt-100 Four Point Alarm. Timer and Counter Modules. Source Files Orcad Format RTD Pt-100 Four Point Alarm - 90001.zip Timer and Counter Modules - 90002.zip Block Diagram : Zoom Image Resources : Watlow heating elements, industrial heaters. Temperature Sensors. NPL Beginners Guides to Measurement - Temperature. Analog Multiplexer PT100 sensors Positive Analog Feedback Compensates PT100 Accurate...

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Connection Diagram of AC Control SSR

2008-11-01T12:20:00.000+05:30

This is an Application note i used to give with my ssr - app011.pdf - Ananth SSR or Solid State Relay or Electronic Relay This is a Thyristor Based Normally Open 230V Switch that can be turned on / off at a fast rate. This switches at Zero Crossover .Built In Snubber reduces EMI and protects the SSR. USE SAME PHASE FOR I/P & O/P. No moving parts hence no wear and tear. Dissipates Heat when in On Condition. Use adequate Heat Sink or SSR will fail. ( 10g / Amp) Dissipation is 1.5...

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Two Setpoint Temperature Controller

2008-10-04T06:38:00.000+05:30

A Two Point Process Controller or Temperature Controller would look like this. When a High-Low Alarm Protection for uC based Controller was needed the same was modified and used. Sometimes uC based instruments just forget and that can be costly, the watchdog timer has solved this problem. In Industrial Process Control we cannot take any chances, so a two tier or even three tier protection is required, especially so if the Job or Raw material being processed is expensive. So Real Time Analog...

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