Elex Quna

Leakage of SSR driving AC Solenoid

2008-09-18T09:15:00.000+05:30

message: I have a 115vac ssr powering a solenoid only pulling a 160ma. upon activation 115vac is applied, but upon deactivation 78vac is still present. I'm told I need a bleeder resistor, but no one knows exactly what size? Can you help?

Mail from GH USA

When a solenoid draws 160mA, you dont need a bleeder. That itself is a bleeder. The leakage of the ssr is very less, it is mainly the current thru the snubber caps.

The SSR cannot leak so much, Is the solenoid a simple coil solenoid or has circuitry? A coil solenoid is also a bleeder for the 1 or 2mA max AC current from caps.

If the solenoid has some control circuit then you may need a bleeder, put a 100K 250V 1W. It also could be a defective SSR or a NC (normally closed) SSR with improper control signal.

Check if control and load circuits are isolated too, make careful measurements across the ssr. Tell me if you still are in doubt,

delabs

Sourcing the SP646 Solid State Relay

2008-08-19T20:48:00.000+05:30

I have a customer that call out a Solid State relay and i cannot find any information on it. Can you help? It is a SP-646. I need a quote on 60 and 120 pieces.

Mail from PG US

Have a look at this, is this what you want. SP646 1 Form A Solid State Relay. contact them if the specs are right, ssousa.com -contact

Description

The SP646 is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input side which activates an optically coupled IC on the output - controlling the firing angle of two back-to-back SCRs. This circuit assures no false triggering under most adverse conditions, and a tight zero-volt window not exceeding 5V.

Features

Inverse parallel SCR output
High transient immunity
400V blocking voltage
1.2A maximum continuous current
Low input control current
High input-to-output isolation
Solid state reliability
Zero-volt switching

Applications

Programmable controls, Valve control, Solenoids, Remote switching, Home appliances, Metering equipment, Heating elements, Gas pump control circuitry,

The SP646 Data Sheet includes the Complete Overview, Electrical Characteristics, and Schematic Diagrams.

Even if you dont find the same number, Digikey or Mouser may have an Equivalent. Just match the Electrical Specs and PCB Footprint, pitch etc.

mouser - digikey - jameco see list here Components Suppliers

delabs

Three Phase AC SSR for 1 HP Motor

2008-08-19T16:33:00.000+05:30

I need to build a three phase AC(in 120V)-AC(out 440V) solid state relay to turn on or off a small(1hp) three phase AC motor. Do you have any idea?

Can I use three MOC3043 and three TIC236E triacs of course with all opto LEDs in series?

Mail from FJP Brazil

See my SSR Circuits , Solid State Relays or SSR Choose a DC Control and AC Load SSR, That is what you seem to indicate.

1 hp = 745.699872 watts

Let triac have 10 A and 600V AC ratings, BTA12600 But now BTA12600 is obsolete, adapt to what is available in your country.

MOC3043 is fine, isolation must be good, take care. Use a Heatsink.

ON-OFF Control inputs can be parallel not series.

On this page you can see a 3 phase SSR i built. Three-Phase-SSR.

delabs

Hypersonic Speakers - Acoustic Heterodyning

2008-08-19T08:50:00.000+05:30

i have been searching for any technical help regarding my project, hypersonic speakers,but my efforts were in vain. hypersonic speakers are instresting to work upon. kindly guide if if you have any knowledge regarding the topic

Mail from GA

See these links ...

Hypersonic Sound: Sound From Thin Air - Mix two signals in a nonlinear medium and you'll end up with four - two at the original frequencies....

Hypersonic Sound speakers are like Invisible headphones.

Sound technology turns the way you hear on its ear - Woody Norris, inventor of ultrasound technology,

Acoustical Society of America Lay Paper on Hypersonic Sound: -

HyperSonic Sound HSS from American Technology Corporation employs ultrasonics to create audible sound in the air. It works by using harmless ultrasonic tones that we can't hear

delabs

Thanks for your reply for hypersonic speakers , but sir i am unable to have any positive feed backs as far as its making is concerned, i have contacted hypersonic industries also in this context, but they want me to buy a unit. i will see what i can do. thank you once again for your help.

Reply from GA

I dont know if this idea is good for college projects, but you can buy a Hypersonic Speaker and demonstrate an application in automation.

delabs

Search Forums and FAQ Resources

2008-08-12T09:41:00.000+05:30

You may find Answers to your Questions below, Use below Resources, you can then contact me too,. Start a New Topic.

Lead Acid Batteries FAQ

2008-08-07T21:50:00.000+05:30

Some Questions, Searches about Batteries Answers Below, My Collection of Website Resources.

delabs

Te Lead Acid Batteries are used in Automobiles and UPS - Uninterrupted Power Supplies. Battery Banks and Arrays are used in Home and Industrial Power Systems with Solar and Wind power charging too. Chargers & Charging -- Battery Management

These batteries have survived many other types, for rugged high power usage, even beyond 100Kva. It is all the more important for us, to learn how to use them properly. Intelligent charge controllers and charge-discharge cycle regulating managers, will ensure a long lifespan for optimum cost-effective usage of this Electro-Chemical Wonder.

Digital Counter - 4029 and 4511

2008-06-24T12:19:00.000+05:30

I just about the circuit you made. what kind of IC is 4029N & 4511N? Is it a diver/decoder? I tried to research on the datasheet but it cannot give exact specification...

Mail from JT from Philippines

4029 is a Preset Dec-hex, up-dn, Counter - and 4511 is a 7-Segment Display decoder. Learn more see ....

Word doc and exe attachments i don't open. send a jpeg photo or rtf or pdf or prepare your doc online Google Docs. please also tell me which page or circuit is this question about. any other doubts feel free to ask. Is it this ... Simple Digital Counter - doc00021

delabs

yes, .thanx for the links..i'll try to go over with the theory..so where can we purchase those items if ever we need it?

Reply from JT

It depends on which country you are in see this page Components Materials

delabs

Halogen bulb lamp dimmer circuit

2008-06-19T16:15:00.000+05:30

Can someone provide me a (simple) schematic for a dimmer that would control 12 VAC about 80 watts. This would be used to control a lamp with halogen bulbs.

Anonymous in Hobby Hound

Here is a listing study them and choose, try out, learn and then build the one right for you.

delabs

Bioamp for muscle signals - EMG

2008-06-18T13:24:00.000+05:30

message: I'm working an a bioamp for muscle signals. This is the base design, but it does not work. Basically what I want to do is a circuit that amplifies my muscle signals and is able to run a small dc motor when I flex a muscle. Any help? Thanks

Mail from JX US

Study these links and send me a feedback ....

delabs

SCADA System - Project Idea

2008-06-12T21:45:00.000+05:30

Hello Sir, I am a student of Electronics and Instrumentation Branch from BP. I am doing my training at ..... where i have been assigned a project to implement SCADA System using Microcontroller.

Right now,i have a good knowledge of PSOC and AVR microcontrollers but since i am new to this technology,i am not getting how i should proceed for the project.i would be greatful to you if you can provide some information about the previous projects students have done in you organization regarding scada implementation.

Mail from MG India

A "SCADA System" may consist of a Human using a Computer with Special Software Overseeing a Process Control System made of many sensors, transmitters, autonomous controllers and actuators made of motor drives and heaters.

Some of these elements may send data to the computer which may Analyze and Indicate the condition of process or progress. The Human Operator can then fine tune the parameters of his system or study and record process cycles for quality and yield.

You discuss this with your mentor and then build a part of it, or implement a part of it in an existing system. A whole SCADA system is too big a project, but a simulated or demo software interface project can be made.

Try seaching at Google Scholar also study links below.

This will be posted to Elex Quna, comment on that post to continue. Any other doubt post as a comment, I will Answer it.

delabs

Using LEDs with Battery Power

2008-05-08T14:28:00.000+05:30

What are LEDs ? How can we use them for Long Battery Life

Mail from AD

If LED flashes at 5-10 K Hz at even 50% Duty Cycle. It may save some power and improve life. So it is just an idea, it may not solve the problem. The idea was to improve battery life and give uniform light for annunciators. It may not be good for flashlights.

delabs

LF353 - Wide Bandwidth Dual JFET

2008-05-08T10:52:00.000+05:30

LF353 - Wide Bandwidth Dual JFET

These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II™ technology). They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents.

(Google Talk Transcript - Year 2006 )

TF (12:16:46 PM): i need a clarification on OpAmp
delabs (12:16:57 PM): ok tell me
TF (12:20:55 PM): what parameter should I check to know the frequency response of an Opamp
TF (12:20:55 PM): the thing is i am reading about a perfect rectifier
TF (12:20:55 PM): so i am trying to find out how to get its maximum frequency
delabs (12:21:14 PM): ok
delabs (12:22:02 PM): you mean precision rectifier
TF (12:48:56 PM): are u there sir
delabs (12:49:17 PM): national.com/mpf/LF/LF353.html
delabs (12:49:03 PM): These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage. They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents. The LF353 is pin compatible with the standard LM1558 allowing designers to immediately upgrade the overall performance of existing LM1558 and LM358 designs. These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth.
delabs (12:50:16 PM): Characteristics of Operational Amplifiers
TF (12:52:03 PM): checking
TF (12:52:26 PM): i think slew rate would be the parameter
delabs (12:52:42 PM): great, you got it

(Links modified as educatorscorner.com has moved here Agilent - Educator's Corner, use search 'slew')

Insulation Resistance Analyzer Required

2008-03-31T21:22:00.001+05:30

Please quote for Insulation Resistance Analyzer DRT101
with regards...

Mail from AT India

delabs is a website for education of engineers and hobbyists . The photos and documents are products that i used to make years back. I do not manufacture now. The circuits and photos are to give ideas for youngsters and entrepreneurs.

Please search India Mart , that will help. I just found one Motwane Insulation Tester - D2K

delabs

If anyone wants to quote a Insulation tester to AT, start by commenting on this post with an OpenID.

Logic Analyzer on Computer

2008-03-23T15:36:00.001+05:30

The following was submitted on March 8th, 2008 at 06:47AM (CST).
HiQFormMail version 1.5.1 - delabs.net - paysource

Subject: delabs Schematic Source Request.
Circuit: del20006.pdf
Title: Test circuit for Logic Analyzer
Message: I am a retired hobbyist.

Mail from JL USA

Sorry for the late reply, Can you explain in detail your doubt or problem. Meanwhile Have a look at these circuits

delabs

I am interested in obtaining a copy of the file "Logic.zip" referred to in the article. PC-Based Logic Analyzer (below). The link to the file is not available. The file contains the software for the circuit described.

Reply from JL

If anyone wants to interact with JL, start by commenting on this post with an OpenID.

These books may help learn Interfacing Your Designs to a PC.

Parallel Port Complete: Programming, Interfacing & Using the PC'S Parallel Printer Port by Jan Axelson

USB Complete: Everything You Need to Develop Custom USB Peripherals (Complete Guides series) by Jan Axelson

Room Temperature Monitor and Alarm

2008-03-17T12:28:00.000+05:30

I am required to design an electronic system that monitors the temperature between(22-24 degrees Celsius). Given are power supply, Analogue subsystems and digital subsystems. the accuracy of the digital control circuit is limited by the accuracy of the temperature sensors. A green LED is lit to indicate correct temp range.

A red LED indicates out of range temperature and in sustained events( where this indicates out of range temp which is counted, displayed and timed) a large LED is lit. In a event where the sustained event exceeds 6 days an alarm is sounded to indicate a possibility of a system failure.

Now I need help on how to come up with the correct circuit diagrams which can work , how to simulate and to get the project done, please help, even direct me to books on the project or other sites please...

Mail from AM South Africa

First acquire the room temperature as an analog value. This requires a sensor for the range you indicated a Semiconductor sensor like LM335 will do fine.

Now monitor and generate Logic outputs for temperatures out of range using a Window Comparator. Then for the timed events you need a Timer circuit. And a Logic to set off the Alarm or Annunciator.

All this can also be done by a PIC circuit if you can write some code. I have given some pages to see, study them, that will be sufficient

delabs

Orcad Spice Simulation CD4060

2008-03-16T20:48:00.000+05:30

I found your web site today. I am looking for the CD4060 spice model for Orcad Capture. My Orcad version is the 9.2 (complete but without CD4060 !!)

I saw on your web pages a design using this component. How can I have the CD4060 model (to use it in simulation) ?

Mail from EG France

Have a look at these links.

PSPICE 9.1 student version - electronics-lab.com-downloads-013
see the database library files.

"The Orcad demonstration package includes several libraries for circuit layout, but only the EVAL.LIB has SPICE models as well. This library includes a range ...."

Please study all links above and tell me if it solves your problem, Look and study each link above. If you have a problem still, then i will search again or find a solution

Also try out and use Cadsoft Eagle.

delabs

Application for 8051 mcu project

2008-03-12T16:56:00.001+05:30

Unique Application for 8051 mcu project ?

Post by J9

Look at this place

8052.com - The Online 8052 Resource
Atmel Products - Microcontrollers - 8051
8051 Microcontroller and rentron.
The best place is PJRC: Electronic Projects
Amazing place here Build Your Own Microcontroller Projects at Thailand.
8051 Sourcecode
SDCC - Small Device C Compiler
Circuit Cellar Ink 151
Sam's 8051 Page
Microcontroller Beginner Kit

delabs

This is an answer of mine to an old post - 2006

How does RTD Work

2008-03-12T13:42:00.001+05:30

How Resistance temperature detector works?

Post by JG

The most popular RTD is PT-100, Platinum 100 Ohms, As all Metals have a Temperature Coefficient of Resistance. The Resistance of RTD increases with rise in temperature.

Even Copper wire can be used, but you need to have a very thin and long wire to make usable measurements.

delabs

This is an answer of mine to an old post - 2006

Build RFID transmitter and receiver

2008-03-11T21:05:00.001+05:30

Guide on how to build my own RFID transmitter and receiver?

Post by C1

You will find them here ...

delabs

This is an answer of mine to an old post - Tuesday 27 June 2006 22:34

Continuity Tester

2008-02-27T19:09:00.001+05:30

Question - continuity tester circuit

Scart to RGBS Circuit

2008-02-27T19:04:00.001+05:30

Question - scart to rgbs circuit

8254 Programmable Interval Timer Counter

2008-02-04T15:06:00.000+05:30

I am doing final year b.tech, i am doing project on 8254 controller. please can u give me information about it.
thanks in advance.

Mail from SA India

delabs

Ultra Sound Sender Detecter Diagram

2008-01-31T15:29:00.001+05:30

I am a University Physics technical staff member in Sri lanka and I am searching a Diagram and full detals about Ultra sound detecter (Sender & receiver & Detecter). It must be arround (Detecting range ) 1.2 MHz. This is for the student practical activities.

Pl help me if you have any information. This will be a gratefull help to the students for their studings.

Mail from PBG

See an earlier post - Ultrasonic distance measurement if i find more it will be added here Ultrasound

Have a look at all links below, that might help

Circuit explanation for Ultrasonic Range Meter - The detection is done to detect the received ultrasonic signal. This is the half-wave rectification circuit with Shottky barrier diodes. ...

UltraSonic Radar - It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered by the circuit the ...

Circuit explanation for the ultrasonic alarm - The circuit this time is the same as the circuit for Ultrasonic Alarm (1) except Alarm detector. As for the circuit explanation except Alarm detector, ...

Ultrasonic Range Meter - As for the range meter which doesn't use PIC, refer to "Ultrasonic Range Meter". I created the PCB pattern for this circuit using EAGLE CAD. ...

4QD-TEC: Ultrasonics: remote control and Intruder detector - These ultrasonic circuits are all quite old: my notes date them at mid-70s so ... The last circuit is an ultrasonic preamp with a twin T feedback to make it ...

Ultra-Sonic Ranging Design - This project started after I looked at the Polaroid Ultrasonic Ranging module. It has a number of disadvantages for use in small robots etc.

A simple ultrasonic range detector - My teacher asked me to make him a ultrasonic range detector for backing up his turck. I wanted to know if there is any way (that anyone.

Schematics Depot (tm) - ultrasonic switch circuit - The ultrasonic receiver circuit uses an ultrasonic receiver transducer to sense ultrasonic signals. It also uses a two-stage amplifier, a rectifier stage, ...

Ultrasonic Oscillator Circuit - Ultrasonic Generator Circuits - Ultrasonic Oscillator Circuit - Ultrasonic Generator Circuits - Ultrasonic Motion Detector - Ultrasonic Dog Whistle - Ultrasonic Sound Receiver - Find out ...

Sensor circuits - Parking sonar an ultrasonic parking sonar circuit ... Ultrasonic Range Meter Ultrasonic Range Meter, the Ultrasonic Range Meter with PIC16F873, Educypedia ...

A PIC sonar (ultrasonic) range finding project. - The project uses 5 standard transistors to receive and transmit the ultrasound and a comparator to set the threshold echo detection level - so there are no ...

Power Supplies, AC DC Power Supplies, Medical Power Supplies - This article describes the project, including a discussion of how ... When the frequency of the ultrasound system changed, the timing circuit in the power ...

Active Sensor Project - The 'active sensor' in this project is a depth sensor. ..... The value for the speed of ultrasound that the. circuit uses in calculations is determined by

Integrated Circuits in Medical Ultrasound | The Thomas B. Thrige - signal processing activity can be performed in a single integrated circuit. ... Thus the project has made it possible to develop very compact ultrasound ...

Remote Ultrasound Transmitter/Receiver - project is not yet completed, the basis has begun. The circuit mainly consists of ... This allows the Ultrasound. transmitter not to be heard. The actual ...

Metal Detection, Ultrasound, other Robots and why not Mice? - bottom of the first ultrasound circuit board after. soldering. Figure 12: The first prototype for the ultrasound. The same soldering approach using wires

TITLE OF THE TERM PAPER - Besides being used as a Bat Detector, the circuit could also be used as a simple tool to indicate frequency, to find tyre punctures (which emit ultrasound

Silicon Chip Online - Circuit Notebook - Besides being used as a Bat Detector, the circuit could also be used as a simple tool to indicate frequency, to find tyre punctures (which emit ultrasound), ...

Building a Dummy Bat - Batty is a very simple circuit that generates ultrasound chirps. It uses the 3 oscillators that can be built from a single hex IC.

Analog Devices: Analog Dialogue: How Ultrasound System - There are major trade-offs to be considered when designing ultrasound front-end circuits. Performance parameters in the front-end circuit components affect ...

Ultrasonic (Ultrasound) Electronic Circuits - Ultrasonic (Ultrasound) Circuits

delabs

Understanding Transistor Power Dissipation

2008-01-17T11:49:00.000+05:30

I like your page about current source circuit basic design. However, I still have Little confuse of the power dissipation calculation.

The max power dissipation of my circuit is 20.5V x 0.5A = 10.25W, but transistors I found are 2W power dissipation. But my input voltages is just varied from 18.0V to 20.5V only. Do you think the 2W power dissipation transistor is fine? Any help will be appreciated.

Mail From MT

When the Current source output is short circuited or connected to a low impedance load say 10 ohms, the full voltage of input 20V falls across the transistor but current is limited to 0.5A. which means the 2W transistor may Roast. The transistor when conducting, the watts is the volts across it and current thru it. Not your supply Voltage. Design in such a way there is no short circuit or a a power resistor in source. But then efficiency drops. The best way is to use a switching supply design or keep the input voltage across transistor to a minimum.

delabs

Metal Detector Circuits Problem

2007-12-18T13:53:00.001+05:30

With the best wishes for you. I found your address and browsed your website. I have a question and hope to take your help and answer.

I need to good metal detector's circuit and I find several in the web, any of them worked ? what is a problem in them and where can I find one that works with best depth? Could you design or point the mistake in some circuits? Thank you for your answer beforehand.

Mail from AS

delabs

Thank you for your answer and sites. But some of them that are professional namely "twin loop" built but it has problem and didn't work.

I think it may be a indicated, there is a problem with them. How can I make it correctly? could you proper design such circuits?

I am not professional and of you do, I will pay for your works.

Reply from AS

If you clearly specify what you want with a drawing, And indicate what you may be able to pay and your contact details too.......

Then, I will publish your request in my site. People visiting my pages may contact you. You can Try it out, I may not be able to help now.

delabs

(PS - You can offer a solution to AS's Problem, post your design page details, All Comments are moderated, Commercial or Business comments will be deleted, designers can indicate homepage.)