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Page Name: Mini Mic Pre-Amplifier Circuit based IC LM358


Posted by: project maker
Created at: Saturday 25th of February 2012 03:35:28 AM
Last Edited Or Replied at :Saturday 25th of February 2012 03:35:28 AM
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Mini Mic Pre-Amplifier Circuit based IC LM358



Simple Audio Pre-Amp circuit
Designed based on single Transistor 2N3904, this circuit will provide good gain for weak audio signals such as electret microphone. Easy to build and really simple for pre-amp circuit

Condenser Mic preamplifier
This is a very simple preamplifier circuit for condenser microphone. This mic preamplifier also can be used for dynamic microphone.

You can replace the BC549 with BC109C. For better audio result, use ultra low noise tra..................==> [ Click Here to Read More ]



Page Name: condenser mic amplifier using bc549 and bc547


Posted by:
Created at: Monday 13th of May 2013 05:02:40 AM
Last Edited Or Replied at :Monday 13th of May 2013 05:02:40 AM
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i need a report on the topic for comparison...
[email protected].................==> [ Click Here to Read More ]



Page Name: Cell Phone Detector details


Posted by: project helper
Created at: Thursday 25th of October 2012 04:55:19 AM
Last Edited Or Replied at :Sunday 27th of January 2013 11:26:27 PM
Detector , Phone, Cell , Cell Phone Detector, cell phone detector , mobile phone signal detector circuit diagram using lm358, result and discussion 0f cellphone detecor , cell phone detector detail, cell phone detector details , how to use 12 16v in mobile phone detector using op amp,
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Cell Phone Detector



Project Summary

This is a mobile phone sniffer circuit that can detect the signals being used in the GSM (Global System for Mobile Communication) band at about 900 MHz. Since the signals are digitally encoded, it can detect only the signal activity, not the speech or the message contents. A headphone is used to hear the detected signals.

Project Description

The circuit schematic is given in the .rar archive attachment. There are two separate detector units. Every detector unit consists of ..................==> [ Click Here to Read More ]



Page Name: automatic street light control using ldr and lm358


Posted by:
Created at: Monday 03rd of September 2012 08:07:19 AM
Last Edited Or Replied at :Tuesday 04th of September 2012 07:01:24 AM
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hi...

when i connect lm358 and ldr in automatic streetlight controller,vcc supply is 12vdc,at output point i am getting only 6v,but i want to on 12vdc coil relay,pl help in this regard.

Thanking you very much

Anusha ..................==> [ Click Here to Read More ]



Page Name: Cement Plant Process Automation


Posted by: project ideas
Created at: Wednesday 13th of June 2012 06:18:47 AM
Last Edited Or Replied at :Wednesday 13th of June 2012 06:18:47 AM
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that is lower in cost and have implemented it in our plant.

The field environment in our plant is high in temperature, with extensive dust and serious electromagnetic interference (EMI) produced by many transducers, and the technical measurement points are very spread out, which increases wiring costs and workload. After investigating and selecting products from different manufactures with the best price/performance ratios, we chose the I-7000 series remote data acquisition modules

I-7000 series remote data acquisition modules: With these products, you can use the serial port on your la..................==> [ Click Here to Read More ]



Page Name: Mini Mic Pre-Amplifier Circuit based IC LM358


Posted by: project maker
Created at: Saturday 25th of February 2012 03:35:28 AM
Last Edited Or Replied at :Saturday 25th of February 2012 03:35:28 AM
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Mini Mic Pre-Amplifier Circuit based IC LM358



Simple Audio Pre-Amp circuit
Designed based on single Transistor 2N3904, this circuit will provide good gain for weak audio signals such as electret microphone. Easy to build and really simple for pre-amp circuit

Condenser Mic preamplifier
This is a very simple preamplifier circuit for condenser microphone. This mic preamplifier also can be used for dynamic microphone.

You can replace the BC549 with BC109C. For better audio result, use ultra low noise tra..................==> [ Click Here to Read More ]



Page Name: ELECTRONIC STETHOSCOPE


Posted by: project report expert
Created at: Tuesday 16th of August 2011 12:48:08 AM
Last Edited Or Replied at :Friday 19th of October 2012 12:35:11 AM
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ABSTRACT
Electronic stethoscopes require conversion of acoustic sound
waves to electrical signals which
can then be amplified and
processed for optimal listening.
It can be a wireless recording
device, and can provide noise
reduction, signal enhancement,
and both visual and audio output .
INTRODUCTION
Electronic stethoscope is an acoustic medical device for auscultation, or listening to the internal sounds of an animal body usually.
It overcomes the low sound levels by electronically amplifying body sounds.
MOTIVATION
The Electro..................==> [ Click Here to Read More ]



Page Name: logarithmic keying of communication networks


Posted by: [email protected]
Created at: Wednesday 25th of August 2010 11:21:41 PM
Last Edited Or Replied at :Saturday 29th of December 2012 12:06:54 AM
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I am Rohini. I am a fourth year computer science engineering student. I want to present a seminar. For that i selected a topic 'Logarithmic keying of communication network'.but i do not get the content about the topic. I want to submit the seminars report on Monday.I have no any idea about the topic. so please help me to prepare the seminars report. please send me the full content of the topic 'logarithmic keying of computer networks'.please help me
..................==> [ Click Here to Read More ]



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