delabs Schematics now on a WordPress, you can comment on the circuits if you need more details. I will try to clarify your doubt or suggest extra reading.
Electronics Circuits is now Hosted on Laughing Squid.
It is a Copper Squid, That makes it more Electrifying !
eLinux wiki – Linux in Embedded Systems
“..preserve and present information about the development and use of Linux in embedded systems.”
BeagleBoard – TI’s ARM based OMAP3 – Beagle Board
ELC will be held April 6th to April 8th in San Francisco, CA, USA. Conference Information (and registration)
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.
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 Module Silk Screen Proportional Module Drill Template
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 Template
AVRTS2080A – Atmel Touch Library ATmega88 “The AVRTS2080A board is an ideal kit for evaluating the Atmel Touch Library implemented on the ATmega88. The kit comes preloaded with software for two buttons, one slider and one rotor.” ATmega88PA – picoPower technology AVR Microcontroller. 8K Byte self-programming Flash Program Memory, 1K Byte SRAM, 512 Bytes EEPROM, 8 Channel 10-bit A/D-converter(TQFP/MLF). Atmel Touch Technology AVR QTouch Studio
STR910 ARM Evaluation Board – ST A versatile system which can be used both for consumer and industrial product design. It has most of the needed interface for developing the gadget or industrial instrument in the card itself. – delabs “The evaluation board includes the high performance STR912FAW44ARM966E-S microcontroller featuring Pre-fetch Queue and Branch cache, full speed USB2.0 compatible port, Ethernet 100/10 interface, Embedded MAC, a large Dual Bank Flash memory, a large SRAM and Embedded Trace Macrocell for development tool trace support.” Features Include CAN 2.0B interface 3 RS232, with one supporting full modem control Infrared Data Access (IrDA) [Read More ....]
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 must come from a Lighting Circuit of another supply arm, this has to come after conditioning [Read More ....]
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 Display card remains the same. Only the Modules change. No Connectors are [Read More ....]
Universal Serial Bus Controller – TUSB3210 The TUSB3210 is a USB-based controller targeted as a [Read More ....]
Drives LEDs with a regulated output voltage or current (up to 120mA) from an unregulated [Read More ....]
Some Software and Web Design Blogs i maintain, i use these to share my ideas [Read More ....]
International Rectifier – Application Notes International Rectifier Corp. is a manufacturer of power semiconductors (MOSFET, [Read More ....]
Ben Gross – Wireless Networking Wireless Networking , Wireless VOIP. Resources related to Wireless Computing [Read More ....]
Digital Clock Web Gadget for Date and Time This Web Gadget is for the Google [Read More ....]
Mains Voltage Stabilizer Circuits These circuits were drawn for a person in Africa. See the [Read More ....]