Thursday, December 06, 2018

Non Inverting Amplifier - Op-Amp Designs

The input impedance of this module is very high, if U1 is OP07 it is in mega/giga ohms, use CA3140 or LF356 fet input opamps to get 1 tera ohm input impedance, but for high gains OP07 is better as it is ultra low offset. This is a good amplifier for sensor outputs, as it is a DC Circuit.

Non Inverting Amplifier - Op-Amp Designs

Non Inverting Amplifier - Op-Amp Designs

The zener diodes protect the opamp inputs, R1 limits current during high voltage inputs and R1 and C1 form a filter to remove some ac components, C1 should be a plastic type as ceramic and electrolytic caps are leaky.

Non-Inverting Opamp

A large C1 will slow the response time, the sum of Ri + Rf should be greater than 5k so that output is not loaded. Do not connect output to voltages more than vcc/vdd, it will blow Opamp.

Tuesday, December 04, 2018

LED Running lights CD4017

This Demo shows LM555 running a CD4017 Counter to drive Ten Leds sequentially. Red Button Powers LED Running Lights, 555 Clock is counted by CD4017. Adjust R2, See ToolTips.

Screenshot of gadget

LED Running lights CD4017

This is a Gadget Tutorial for this Article LED Running lights CD4017.

Press the Red button below to turn on the circuit press it again to turn off, i have put a new battery and did the wiring for you. The Red LED will flash according to the state of the 555 output at pin 3. The decade counter-divider CD4017 has 10 outputs, for every low to high transition, rising edge, the counter advances one LED. After going one full circle the the first LED lights again and it goes on.....

Sunday, December 02, 2018

Digital Timers Counters and Clocks

Timers and Counters along with Analog Process Controllers formed the front end of Industrial Automation. Even today automation systems and control panels use analog timers and electromechanical counters. These are Indispensable. Analog + Digital combination controllers came next which were little bigger and offered better stability. They had thumbwheel switches as user interface in place of potentiometers.

Digital Timers, Counters and Clocks

uP based Systems with chips like 8085 came after that, they consumed more power and were big in size. The coming of Cmos uC like 80C31 made Process Instrumentation Small and SMD made even 48 X 48 DIN sizes possible. Now Analog and uC based designs are used in different applications. Digital Hybrids and uP instruments are not used as they were Transient-Technology Methods.

Digital Timers Counters and Clocks

These Digital Tutors are interactive and started with very basic JavaScript and CSS. You can operate the controls and see the Truth Table and Results in LED Displays. Controls include DIP Switches and Push Buttons.

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