Reliable loudspeakers needn´t be expensive. K50/8 from company Visaton is a good example of a universal louspeaker suitable even to less favor conditions for a very affordable price.
K50/8 belongs to 5 cm (2“) industrial loudspeakers with an increased resistance. IP65 (from the side of membrane after building into an appropriate housing) says it all. Plastic membrane from mylar is UV-resistant and a metal basket ensure a long-term stable properties in a wide range of temperatures. K50 easily handles what it is intended for – reproduction of voice and various sound in a wide frequency range (naturally except low and highest frequencies). K50 also meets another requirement important for the most of applications – small profile – 17mm only. Similarly like the most of small loudspeakers, also K50 is virtually omnidirectional even at higher frequencies (-5db/90°/8000 Hz)..
Thanks to its small dimensions, low profile, resistance and last but not least also an affordable price is the K50 a suitable component for a sound output of various devices like audio door-keeper, lifts, machines and control panels. K50 and many other Visaton components are our standard stock items. In case of interest in non-stock types, please contact us at firstname.lastname@example.org
Add a sound to your devices – for an outstanding price - [Link]
Irdroid v2.0 is advanced version of the Irdroid remote control hardware. The unit is standalone, powered by 12V DC adapter and it has a bluetooth communication module. The unit features a infra-red remote control for android and a Bluetooth Music receiver in one. The module can be used simultaneously to control home TV/AV equipment and to turn any speaker into a wireless bluetooth speakers.
Irdroid v2.0 – universal remote for Android - [Link]
A new chip from NXP can boost the output power of micro speakers by more than five times, vastly improving the sound quality of mobile devices. By driving over 2.6 watts RMS into micro speakers that have previously been limited to 0.5 W, the TFA9887 IC will give mobile phones, portable music players and tablets much louder sound, deeper bass, and higher sound quality without risking speaker damage.
Adaptive excursion control measures the actual excursion of the speaker membrane to ensure that it never exceeds its rated limit. Real-time temperature protection measures the voice-coil temperature directly to prevent thermal damage. An advanced clip avoidance algorithm monitors audio performance and prevents clipping, even when the power supply begins to sag. Bandwidth extension increases the low frequency response well below speaker resonance. And an intelligent DC-to-DC boost converter maximizes audio headroom from any supply level despite battery undervoltage. The chip automatically adapts to any changes in the speaker – including ageing, damage to the enclosure, and blocked speaker ports – helping to optimize performance and maintain the desired sound quality. [via]
Novel Speaker Driver Delivers Hyperaudio from Mobile Devices - [Link]
Knowles Sound Solutions has launched a specially developed material called N’Bass Virtual Back Volume, designed to improve the acoustic performance of speakers in devices with small form factors. N’Bass stands for ‘enhanced bass’ and it increases the apparent back volume seen by the loudspeaker driver by up to 100%. It can provide better acoustic performance – specifically more bass – or enable smaller loudspeaker box designs while maintaining the same performance. It also facilitates the use of bigger drivers to provide better sound performance in the same total volume. [via]
Miracle Material Doubles Speaker Volume For Better Bass Response - [Link]
I made this portable speaker in the summer. It mixes the stereo input into a mono signal, which is then amplified. It’s powered by a six pack of AA batteries. The batteries are held in an external battery pack, so they are easy to change on the fly, without the need of a screwdriver.
Portable speaker for MP3 player - [Link]
Due to its simplicity (requires minimum external components) and high availability, LM386 is very popular among hobbyists for use in low-voltage audio amplification applications. Most of the time a potentiometer is used at the input side of LM386 to provide a volume control in the output soundbar speaker. The potentiometer does not control the gain of the amplifier itself, but it creates a voltage divider network at the input, which in fact controls the fraction of the audio signal that is fed to the amplifier. This project is about a stereo audio amplifier using two LM386 ICs with digital volume control for both left and right speakers. So, how would you control the volume digitally? You are right, by replacing the traditional electro-mechanical form of potentiometers with digital potentiometer chips. This project uses MAXIM’s DS1868 dual digital potentiometer chip and a PIC microcontroller to control the volume of a stereo output from two LM386 ICs.
LM386 based stereo audio amplifier with digital volume control - [Link]
This project is a homemade speaker. RobertG writes:
It’s a simple speaker, that may be build at home from inexpensive and freely available materials: magnet, cardboard and tape, isolated wire from signal transformer and mini-jack cable from broken headphones.
Homemade speaker - [Link]
This project shows how to take a pair of speakers and put them in two of the original iPods where the scroll wheels normally were.
iPod Speaker – [Link]
This project is a high voltage plasma speaker that is using two mosfets in half bridge to drive the flyback transformer. This reduces the load on the FETs, and thus reduces the heat produced by them. To find out how plasma speakers work see the bottom of this page. [via]
A reliable Plasma speaker - [Link]