50 YEARS OF DEVELOPMENT

Over the years we have developed more than 500 products, averaging about one product a month. A gist of development history is given below

Period When Product Developed	Name of Product	Application/Remarks
1969 to 1971	Oscilloscope 10 MHz DC to DC converter	Developed for Electronic Development Laboratory, N Delhi and Advance Electronics Industries P Ltd N Delhi Time Base Circuits and the Vertical output stages of 10 MHz, DC coupled CRO were developed Development included circuit design, component sourcing, printed circuit design, panel design, mechanical housing design Oscilloscopes were destined for radio/audio amplifier industry and engineering colleges. DC-DC Converters were destined for the Indian Army. Multi disciplinary project involving mechanical & electronics engineering.
1969 to 1971	Earth Motion Recorder Chart Stepper Time Code Generator	Developed for Prof S C Gupta, Dept of Earthquake Engg, IIT Roorkee Precision, ultra reliable LVDT for measurement of earth motion Precision Solid State Circuit for extending the range of chart recorders by automatic stepping Digital circuit for decoding time information from wireless signals & stamping the info onto recorders Product destined for installation in earth quake prone Himalayan region Multi disciplinary project involving mechanical & electronics engineering and on site installations.
1972 to 1975	Analog Computer	Developed for Prof C S Rao, Dept of Electrical Engg, Punjab Engg College, Chandigarh Professional computer with 24 FET chopper stabilised IC amplifiers and 12 Integrators with Repititive operation Included Multiplier, Log/anti log generator, universal mathematical function generator, non linearity simulator, logic blocks, A-D & D-A converters, analog memory pairs. Product involved development of more than 40 individual circuits, corresponding printed circuits, transformers and modular plug in compatible housing. Supplied subsequently all over India to several universities. Many Ph D theses resulted in the simulation work done on these computers.
1973 to 75	Transfer Function Analyser	Developed for Prof G S Sanyal, Dept of ECE, IIT Kharagpur and Prof S C Shukla Dept of Electronics Engineering, Delhi College of Engineering, Delhi Needed to plot Phase and Magnitude Bode Plots of Automatic Control Systems Critical requirement was a VLF function generator, down to 0/001 Hz and to have two sine waves differing in known phase which could be set linearly from 0 to 360 deg and sine, square, triangle waveforms which could be single shot or gated or gave predetermined no of cycles Challenging circuit design because of need of nA leakage boards super beta transistors, poly carbonate capacitors Used by practically all engineering institutions in the 70's and 80's
1974 to 1980	Digital Multimeters 3-1/2 digits and 4-1/2 digits	Initially developed for Mr Rangarajan, Head, Measuring Instruments Division, Bharat Electronics Ltd, Bangalore. to modernize their Division, and replace HP products with Indian A very compact meter made, using Nixie tubes for display & about 20 transistors, all made in India. Used dual slope integration for A-D conversion. Met all performance standards. Developments were continued in subsequent years to add 4-1/2 digit model, options to measure f, C & L, switch from Nixie to LED, transistors to VLSI, 100's of units sold to Industries, Educational Insts., Defence Labs
1977 to 1992	Laser Range Finder	Developed for Instruments Research & Development Establishment, DRDO, Dehradoon, Scientist in Charge, Mr N N Mansharamani. Intended for use by Indian Army's Main Battle Tank Multidisciplinary project involving Electronics, Optics, Mechanical and Metallurgical Engineering Needed conformance to JSS 55555-joint Defence specs for environmental performance. Required substitution or sourcing of strategic components on banned list of US Dept of Commerce
1993 to 1990	Thermal Imager Electronics	Developed for Instruments Research & Development Establishment, DRDO, Dehradoon, Scientist in Charge, Dr R N Singh, Intended for use in air borne surveillance by IAF Challenging Mixed Circuit Design, complex grounding, shielding guarding requirements in elctromagnetic interference rich environment Needed conformance to JSS 55555-Joint Defence specs for environmental performance. Required substitution or sourcing of strategic components on banned list of US Dept of Commerce
1975 to 1985	Power Supply Protectors	Developed for Mr V P Sandlas, Project Director of SLV project, then at the Thumba Rocket Launching Centre, Trivanadram, he retired as Chief of DRDO Repeated failure of imported DC Power Supplies needed investigation Traced the fault to transients riding on power lines and fixed the problem Thyristor based high speed Protection Circuits developed and retro fitted in power supplies
1975 to 1985	High Voltage Power Supplies	Developed for Satellite Application Centre Bangalore Developed to replace 5 to 20 kV regulated power supplies imported from Keithley, Glassman and similar companies Challenges of special materials, coatings, insulations,high voltage devices, hi meg glass enclosed resistances, etc overcome Safety issues, special connectors, sleeves, wires tackled Required substitution or sourcing of strategic components on banned list of US Dept of Commerce
1985-1990	Laboratory Courseware (experiment set up, hardware, instruments with instructional material) for Diploma Course in Electronics Engg covering: Network Theorems Device Characteristics Power Electronics Power Supplies Osc. & Multivibrators Amplifier Circuits Waveform generators Digital circuits Operational Amps Filter Circuits	Profs Anup Dey, N N Bhargava, D C Kulshreshtha at Teacher's Technical Training Institute, Chandigarh heard about our products quality from Defence scientists and called me to make a range of products for engg education. They also discussed modernizing the laboratory content. TTTI felt that the student was spending bulk of his 2 Hour Lab in wiring a circuit & compiling instruments and components and little time was left for analysis of the implemented circuit. For example, after wiring a 2 stage amplifier and getting it to work, no time was left for the student to analyse its frequency response, measure its i/p & o/p impedance, study the stabilty, and measure distortion performance etc. They shifted the hands on soldering, board making to the Projects & Workshop Lab Like this, a range of products, almost >200 in numbers, was developed to support the laboratory work of the complete Electronics syllabus of North Indian states Most of these products were suitable and used by Colleges awarding Bachelor's in Electronic Engg. in the ensuing years.
1980 to 1995	Laboratory Courseware in Digital Techniques Logic Trainer Logic Troubleshooting Kit( Probe, Pulser, Clip and Comparator) Microprocessor Evaluation & Protyotyping Boards	Profs Anup Dey, N N Bhargava, D C Kulshreshtha at Teacher's Technical Training Institute, Chandigarh heard about our products quality from Defence scientists and called me to make a range of products for engg education. They also discussed modernizing the laboratory content. Developed to meet the continuously emerging needs of maintenance personnel as Strowger exchanges were replaced by Cross Bar exchanges and then by Electronic Exchanges. More than 2000 such equipments sold all over the country. The very same equipments were also used for training in maintenance of digital computers.
1973 to 1998	IC Testers: Digital IC Tester Linear IC Tester Automatic Digital IC Tester	Developed as general purpose products to meet the needs of education and industry for testing integrated circuits in labs and for in-coming inspections. The first model introduced in 1973 was displayed at Annual trade fair at Pragati Maidan in Delhi. Digital IC tester could test all types of digital IC's like gates, counters, shift registers, etc upto 16 pins Linear IC Tester could test Op Amps, Video amplifiers, Voltage Regulators, Timers and Phase Locked Loops.
1980 to 2000	Linear Circuits Laboratory Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Linear Circuits and laboratory back up thereof. Experiment on Operational amplifiers Experiments on Phase Locked loops Experiments on Voltage Regulators, Timers Experiments on Custom chips like multiplier, log generator, comparator Experiments on wide band amplifiers
1980 to 2000	Instrumentation & Process Control Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Instrumentation and laboratory back up thereof. A number of Sensor Technology Trainers enabling experiments with pressure, displacement, temperature, speed, flow rate, light intensity, piezoelectric sensors & associated signal conditioning A temperature control process with temp control of moving stream of air with PID controller A modular sensor trainer using building block approach beginning with a sensor and ending with student making a complete process control system
1978 to 1995	Digital & Microprocessor Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Digital Electronics and laboratory back up thereof. A set of equipment for a course in combinational logic A set of equipment for a course in sequential logic A set of equipment for a course in microprocessors A set of equipment based on bread boards to enable prototyping
1984 to 2010	Communication Engg Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Comm Engg and laboratory back up thereof. A range of equipment for experiments in signal analysis and synthesis, noise generation, error probability and Fourier transforms A range of equipment for experiments in analog communication-amplitude, frequency, phase modulation, corresponding demodulation, A range of equipment for experiments in digital communication-pulse amplitude, width, position, code modulation, amplitude, frequency, phase shift keying,delta modulation; corresponding demodulation A range of equipment for experiments in sampling and time division multiplexing and demultiplexing A range of equipment for experiments in transmission lines and active and passive filters Transmitters and receivers of various types.
2005 to 2019	Fibre Optics Communication Engg Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Fibre Optics Communication and laboratory back up thereof. Fibre Optics Kit to learn about relevant tools and hardware Fibre Optics Analog Communication Kit for relevant experiments-propagation, attenuation, bending loss,numerucal aperture etc Fibre Optics Digital Communication Kit for relevant experiments-propagation, attenuation, rise/fall times, eye diagrams, etc
1995 to 2000	Radio/TV Communication Engg Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed to meet need of Engg Colleges for conducting courses in Radio/TV Engg and laboratory back up thereof. An exploded, working, Black & White TV Trainer, spread out on 4x3 ft board showing various stages of TV receivers enabling access to evry circuit point and connection/disconnection of individual stages thru connectors An exploded, working, color TV Trainer, spread out on 4x3 ft board showing various stages of TV receivers enabling access to every circuit point and connection/disconnection of individual stages thru connectors, Almost 500 of each type went to different polytechnics, all over India, under WB funded Technician Education Project
1985 to 2002	Microwaves Communication Engg Courseware (experiment set up, hardware, instruments with instructional material) for Bachelor's Course in Electronics Engg	Developed using guidance and consultation of National Physical Laboratory New Delhi, to complement our range of products and meet the needs of our customers. Complete X band Klystron & Gunn Based Benchs Complete Radiation pattern turn table, 50 types of microwave components. VSWR meter and associated power supplies Experiments include measurement of velocity, frequency, impedance, impedance matching, Smith chart plotting, etc. Multi disciplinary production facility
2004 to 2013	Physics (experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Engg, with Physics as common subject	Developed to execute orders from foreign countries. Superconductivity experiments apparatus to plot I-V graph of Yttrium and Bismuth based superconductors Comprehensive kit to investigate wave properties of light Force Table Newton's ring Apparatus Young's Double Slit Experiment Various types of Resistance Boxes, Wheatstone Bridge, Decade LCR's etc Projectile Launcher Vertical Acceleration Apparatus Projectile Launcher
1990 to 2005	Control Systems Lab(experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Control Systems Engg	Developed to meet need of Engg Colleges for conducting courses in Control Systems laboratory Linear Systems Simulator Compensation Circuits Design Relay control System DC Position control system Light Intensity Control System
1990 to 2005	Control Systems Lab(experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Control Systems Engg	Developed to meet need of Engg Colleges for conducting courses in Control Systems laboratory Linear Systems Simulator Compensation Circuits Design Relay control System DC Position control system Light Intensity Control System
2006 to 2014	Electrical Machines Lab(experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Electrical Engg	Developed to execute orders from foreign countries. Characteristics of AC and DC motorsr Characteristics of Transformers Protection Citcuits, devices for electrical motors Starting methods of electrical motors Speed control of electrical motors Grounding and Protection Circuits
2007 to 2012	Applied Mechanics Lab(experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Mechanical Engg	Developed to execute orders from foreign countries. Free and Forced Vibration Apparatus Whirling apparatus Flywheel Apparatus Belt Friction Apparatus Cam Follower Four Bar Chain Funicular and Polygon Apparatus Four Bar Chain
2007 to 2012	Electrical House Wiring Lab(experiment set ups, hardware, instruments with instructional material) for Bachelor's Course in Electrical Engg	Developed to execute orders from foreign countries Wire Types Different switch circuits like 1 switch,1 bulb; 1 switch 3 bulbs, staircase wiring, etc Alarm types Service Entrance wiring Measurement of current and voltage Measurement of W, VA, VAR, VAhr, VARhr Use of Megger and so on