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The Gallery of Mechanical Audio Amplifiers. - Douglas Self
http://www.douglas-self.com/MUSEUM/COMMS/trumechamp/trumechamp.htm
This page is dedicated to amplifiers that are mostly mechanical, rather than those which are electric-in, electric out, such as the carbon-microphone repeaters used in the early days of telephony. These can now be found in the Electromechanical Amplifiersgallery. THE HIGHAM FRICTIONAL AMPLIFIER FOR GRAMOPHONES.
Mechanical Amplifiers - Audio | Video | Circuits
https://www.epanorama.net/sff/Audio/Circuits/Power_amplifiers-linear/Mechanical_Amplifiers.pdf
mechanical amplifier is very simple. The electromagnet attracts the armature in response to the incoming signals. This varies the pressure on the carbon granules in the transmitting part, which varies their electrical resistance, and hence the current flowing in the output circuit. The first Shreeve mechanical amplifier. Date approx 1904.
Audio Amplifier Circuit
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
on the LM386 IC from National Semiconductor. The audio amplifier will be a self-contained, battery-operated component. In the second part of the lab you will construct a microphone circuit using a compact electret condenser microphone cartridge. These circuit modules are important building blocks of many audio communications systems, and will be
Electro-Mechanical amplifiers
http://douglas-self.com/MUSEUM/COMMS/mechamp/mechamp.htm
Left: The first Shreeve mechanical amplifier: approx 1904. In 1903 Herbert E Shreeve of the American Telephone & Telegraph Company (AT&T) was given the job of designing a practical mechanical amplifier. He discarded the microphone and earpiece diaphragms, and replaced them with a simple plunger that was driven by the receiving coil and pressed against the carbon …
Mechanical vibrations picked by an audio amplifier ...
https://electronics.stackexchange.com/questions/151766/mechanical-vibrations-picked-by-an-audio-amplifier-strange-microphone-efect-whe
I opened today my Philips audio system (30W woofer + 20w satellites) because it has a lot of noise. There is something weird with that amplifier: when I knock into the circuit board with my finger nail I hear in the sub-woofer a noise EXACTLY as when you knock with your finger into a microphone.
Mechanical amplifier - Wikipedia
https://en.wikipedia.org/wiki/Mechanical_amplifier
A mechanical amplifier, or a mechanical amplifying element, is a linkage mechanism that amplifies the magnitude of mechanical quantities such as force, displacement, velocity, acceleration and torque in linear and rotational systems. In some applications, mechanical amplification induced by nature or unintentional oversights in man-made designs can be …
Stylish Passive Amplifier : 4 Steps (with Pictures ...
https://www.instructables.com/Stylish-Passive-Amplifier/
A passive amplifier (or mechanical amplifier) is a device which amplifies sound without the use of power, it works like a sort of trumpet by changing the impedance of the air around the speaker to maximize the efficiency of your music player. This passive amplifier was designed by me for my AS product design course at school.
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