lm386 - Circuitos electrónicos

This project describes the implementation of a phone line audio and event recorder originally devised for monitoring technical support call center attendants for quality assurance purposes. Our initial objective was to have a device that digitizes the calls with good audio quality and

http://www.radiolocman.com/shem/schematics.html?di=64371

distorsionador de voz

https://www.electronicafacil.net/circuitos/esquema67.html

Just the picture of a crystal radio successfully made by myself. It manages to capture several UK channels, most notably BBC Radio 4 and Absolute Radio. For this project I used enameled copper wire BS6811 (British Standard) for the inductor coil, a Schottky barrier diode 1N5817, an a Taiwanese-made crystal earphone. The schematic of the circuit is not fancy at all; you just type in 'crystal radio' in wikipedia, scroll down to the last line and there is the simple schematic i ve been using. By su.......

https://yamanashimasamune.blogspot.com/2011/06/my-first-working-radio.html

Receiver circuits, schematics or diagrams. Discovercircuits.com is your portal to free electronic circuits links. Copying content to your website is strictly prohibited!!!

http://www.discovercircuits.com/R/receivers.htm

Here is simple circuit of a simple emergency light that can be constructed without much pain

https://circuitsector.blogspot.com/2010/05/20w-low-cost-emergency-light.html

http://www.techlib.com/electronics/audioamps.html

http://www.rfcandy.biz/communication/afamp.html

https://elec-circuits.blogspot.com/2011/04/low-cost-am-radio.html

http://www.aaroncake.net/amp.htm

What do you get out of interfacing Arduino to a low cost keyboard -UPDATE - New synthesis mode added - Auduino style grain synthesisUPDATE - Listen to the five dollar synthesiser here - Why hack a cheap childs keyboad - 1) Three octaves or more of ready made piano style keys2) A large number of general purpose buttons for configuring you synth engine, adding effects or controlling a sequencer This post concludes with a sketch which will provide your keyboard with some interesting capabilities to.......

https://rcarduino.blogspot.com/2012/10/five-dollar-synthesiser.html

While talking to a distant subscriber on telephone, quite often we feel frustrated when the voice of the distant subscriber is so faint that it is barely intelligible. To overcome the problem, circuit of an inexpensive amplifier is presented here. It can be assembled and tested easily. There is no extra power source needed to power up the circuit, as it draws power from the telephone line itself. The amplifier will provide fairly good volume for the telephone conversation to be properly heard in.......

http://www.circuit-finder.com/categories/telephone-related/miscellaneous-telephone/410/telephone-amplifier

An Electric Stethoscope - Need to do a bit of self-diagnosis? Make sure your heart is still beating or check other body sounds? Maybe you would like to sort out some unusual rattles or other noises in your car's engine or other machinery? This electronic stethoscope will do the job ? and you can listen via headphones or a loudspeaker. It has switchable frequency shaping in four bands so you can hone in on sounds which might otherwise be masked out. Want to make sure your heart is still beating? .......

http://archive.siliconchip.com.au/cms/A_112547/article.html

This unit is an updated version of the Wide Dynamic Range Field Strength Meter. While the basic function is the same, it has several critical differences: It uses a specialized integrated circuit, the Analog Devices AD8307. This chip is designed specifically as a logarithmic amplifier for use through 500 MHz. Using the AD8307, it has a wider dynamic range (85 dB versus 55 dB) and it has built-in temperature compensation. Because of the different nature of this type of detector - and the fac.......

http://www.electronics-diy.com/field-strength-meter-wide-dynamic-range.php

This multitone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100 μH inductor is used […].......

http://electronicsforu.com/electronics-projects/multitone-siren

https://bestengineeringprojects.com/electronics-projects/telephone-amplifier-circuit