delabs Circuits

Wednesday, December 06, 2017

Ramp Generator - Triangle Wave Generator

Two questions on Ramp Generators -  I need a circuit design for a ramp generator. The ramp generator circuit that I'm looking for is a 1khz ramp generator capable of + to -50 v at 50m using a microprocessor with digital to analogue converter and output reconstruction filter followed by a high voltage operational amplifier.

The generator is going to be used for RFA (retarding field analysers) on plasmas.

Mail from MF of UK

I need a circuit design for a ramp generator. The ramp generator circuit that I'm looking for has put out a linear time varying positive voltage from 0 to +10 volts and needs a ramp time of 45 minutes. So from 0-10 volts in a 45 minute time frame. Maybe also a reset switch to reset the timer again. Can this be done? Please advise. Thank You

Mail from JA

Can you tell me in what application or how you plan to use it. Then i can probably help you better or make a circuit for you. there are many ways to do it. one is a constant current source charging a capacitor. or a staircase generator with a D-A and counter. send me more details.

4QD-TEC: Waveform generator circuits

This circuit was used as a ramp generator for a transistor curve tracer: the positive going ramp was used for testing NPN transistors and the negative ramp for testing PNP transistors.

Triangle Signal Generator

The first circuit produces a clean 2.5v reference voltage.  The second is configured as a classic multivibrator oscillator, whose frequency can be changed using a variable resistor.

Ramp Generator - Triangle Wave Generator

Precision Triangular-Wave Generator Uses a Single IC

"This application note outlines the implementation of a single-supply, triangular wave oscillator using the MAX9000 and some passive components. The application circuit uses an op amp, comparator, and a voltage reference as active building blocks. The MAX9000 is chosen because it integrates these three components. "


Saturday, October 28, 2017

ECG EEG EMG bio-amplifier

i need to build a bio-amplifier capable of amplifying ecg, eeg & emg signals and displaying the corresponding waveforms on a computer monitor. the bio-amp has to be accompanied by a software program built using QBasic/QuickBasic. the bio-amp must use an rs232 serial interface port.

mail from AM

Study all these resources, that will help you with your project and learn the science.

Electrocardiogram (ECG) circuit

This application note makes use of a DrDAQ Oscilloscope / Data Logger to read and store electrocardiograms but this can be subsituted by any of the PicoScope range of oscilloscopes.


A Portable, Low-Power, Wireless Two-Lead EKG System - PDF

Sensor devices (“motes”) which integrate an embedded microprocessor, low-power radio and a limited amount of storage have the potential to significantly enhance the provision of emergency medical care.

Zigbee- based Low- cost, Low- Power Wireless EKG

Electrocardiogram (EKG) monitoring is of prime importance in the medical world. Using the state of art technology to take it to a wireless platform can open up a broad spectrum of wireless medical devices.

ECG Monitor - Abstract - PDF
This project deals with an application of H3687 from Renesas H8 series of processors in the Medical field to record ECG.

PC based ECG Monitoring System
A project on creating and research the framework needed for building a PC based ECG monitoring system.


Friday, October 27, 2017

Scart to RGBS Circuit

Question - scart to rgbs circuit - SCART Connectors were used for Video and TV -  mail from KU

Have a look at these examples

SCART RGB interfacing

SCART connectors used with many European video equipments is designed to carry composite video and RGB video signals.

SCART Connectors for Video and TV

SCART - Wikipedia

In Europe, SCART used to be the most common method of connecting AV equipment, and was a standard connector for such devices; it was far less common elsewhere. As it was designed to carry analog standard-definition content, SCART has become obsolete

A Single SCART Interface for Video - Maxim/Dallas

In many SCART applications, specialized ICs are used for the SCART interface because of the complicated switching required. This is not cost effective for single SCART implementation.

Now that HDMI and HD Videos have come, these issues may not bother much.

Friday, October 20, 2017

Visual Inspection for Quality Control

Wanted a system for detecting: "missprinting cartons reject" in production - Message: pls give me help about mention subject.

Mail from SS

You can scan the manufactured objects with a camera connected to computer USB. Then compare the scans got with a reference standard. Apply a tolerance for acceptance or rejection. Based on the quantity of rejections improve process, till faults are within acceptable limits.

The scanned object must be in same position and same angle for proper results. This depend on some guiding system in conveyor to make object position properly.

Machine vision (MV) is the technology and methods used to provide imaging-based automatic inspection and analysis for such applications as automatic inspection, process control, and robot guidance, usually in industry.

Machine vision is a term encompassing a large number of technologies, software and hardware products, integrated systems, actions, methods and expertise.

Machine-Vision in Genomics Research

A novel machine-vision-based facility for the a.utomatic evaluation of yield-related traits in rice.

Machine-Vision in Genomics Research

The evaluation of yield-related traits is an essential step in rice breeding, genetic research and functional genomics research. A new, automatic, and labor-free facility to automatically thresh rice panicles, evaluate rice yield traits, and subsequently pack filled spikelets is presented in this paper.

Details of the inspection unit. The inspection unit consisted mainly of a three-stage conveyor, two line-scan cameras, two LED light sources, a wind separator and an unfilled spikelet outlet.

Inside the Box Winn Hard

Machine-vision system validates barcodes on packages within carton. The cameras take images of the open shipping container, locate individual packages inside, and then locate the product labels on the individual packages. The information along with images for archive and audit is returned via Ethernet to the Numina Group’s Carton Audit and Validation System (CAVS).