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
RTD Pt-100 Signal Conditioning Module
Process Control
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Mar 192009
Display ICL7107 – Temperature controller
Process Control
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Mar 192009
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 STC1000
Mar 182009
ispMACH 4000ZE Board – Lattice Semiconductor “This board is designed to help you quickly evaluate the ispMACH 4000ZE, prototype your designs, check performance and verify power consumption.” Features Include LCD panel (2 x 7-segment) Status LEDs and 8 utility LEDs 2 generic pushbutton input switches 8-bit input switch Access to nearly all device I/O USB Cable for power and programming On-board programming control, using Lattice MachXO + USB controller. ispLEVER Classic is the design environment for Lattice CPLDs and mature programmable products. From – Lattice Semiconductor
Analog Mux for Data Acquisition Systems
Process Control
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Mar 172009
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 [Read More ....]
Multiplexed Presettable Timer with ICM7217
Design
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Mar 172009
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 supplies. ICM7217 4-Digit, Presettable, LED Up/Down Counter Maxim Study this, if you are [Read More ....]
PIC18F8722 Microcontroller Explorer Board
Embedded
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Mar 162009
PIC18F8722 Microcontroller Explorer Board “The PIC18 Explorer features a PIC18F8722 microcontroller –the superset of …. PIC18 general purpose 5V family. This board also includes the PIC18F87J11 processor PIM, which is the superset of our PIC18 J-series of 3V MCUs for cost-sensitive applications.” Features Include Alpha-numeric LCD display USB interface for USB to RS-232 communication 25LC256 SPI EEPROM Crystal oscillator Potentiometer (connected to 10-bit A/D, analog input channel) Analog output temperature sensor LEDs, RS-232 port, Demo Software etc.
Mar 162009
LM3445 – TRIAC dimmable offline LED driver “Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today’s LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming…..” TRIAC dimmable Solutions -o- WEBENCH LED Designer Features Include Application voltage range from 80 VAC to 270 VAC Angle detector/decoder enables wide (100:1) full range dimming Scalable output current up to and greater than 1A
100kHz Half Bridge Convertor – SG3525
Power Electronics
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Mar 102009
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 ....]
