Project Solutions (2011/08/09)
Index
Back to the Future: Home electronics from the （recent） past 2
Published:2011/8/9 22:55:00 Author:Amy
Attitude Sensor Bernd Oehlerking The circuit presented here (in two versions) uses a light barrier as a position sensor. In the first version (Figure 1), the light barrier consists of an LED (Dl) for the light source and a LDR (R2) for the receiver. The LDR is part of a CMOS oscillator that generates a di... (View)
View full text | Comments | Reading(1414)
Power To Spark: 31 power supplies side by side （2）
Published:2011/8/9 22:22:00 Author:Li xiao na
Outputs As already mentioned, it can be convenient to have several outputs available. Besides units with several adjustable outputs, there are also power supplies available with one or more fixed-voltage outputs in addition to a ’normal’ adjustable output. The fixed voltage is usually 5 V or 12 V. Most lab supplies nowadays are fitted with sockets that accept banana plugs. T... (View)
View full text | Comments | Reading(730)
Back to the Future: Home electronics from the （recent） past 1
Published:2011/8/9 22:21:00 Author:Amy
High Voltage Amplifier Audio analyzers, such as the Audio Precision series have signal generators that for certain test purposes do not hove a sufficiently high output voltage. That is why we have designed this ’booster’ amplifier stage. It provides the same amount of voltage as a 300-W amplifier into 8 LI. App... (View)
View full text | Comments | Reading(503)
On the Buses: Last station still far off 3
Published:2011/8/9 22:06:00 Author:Amy
David Daamen Konnex A full discussion of every available standard is unfortunately beyond the scope of this article, hence we will pick out one we think is particularly interesting. The standard proposed by the European Home System Association (ESHA) is a good example of how it should be done. Apart from supplying specifications on medium and communication protoc... (View)
View full text | Comments | Reading(577)
On the Buses: Last station still far off 2
Published:2011/8/9 21:39:00 Author:Amy
David Daamen Networking Standards like RS-485, Ethernet, FireWire, HomePNA HomePlug, MoCA, USB and XI0 are primarily descriptions of ways to communicate over a physical medium. HomePNA, for instance, is a standard with widespread use in the USA, describing how connections with speeds up to 240 Mbit/s can be established within the home using the (existing) telephone wiring. T... (View)
View full text | Comments | Reading(443)
On the Buses: Last station still far off 1
Published:2011/8/9 21:24:00 Author:Amy
David Daamen Being able to control a TV or a stereo from the comfy chair is taken for granted these days. However, home automation does not stop at remote control for audio & video equipment. Although an increasing number of manufacturers jump the bandwagon called Home Automation or even the Smart Home, t... (View)
View full text | Comments | Reading(581)
Diagnostics and Development Tools for SMBus and l2C
Published:2011/8/9 6:34:00 Author:Amy
AVIT Research Ltd. has released a low cost l2C Bus Tool for the diagnostic and development of embedded system SMBus and l2C communications. The Tool combines ease of use with comprehensive facilities lo monitor bus activity and powerful functionality for participating on the bus. Messages can be sent and received as either Master or Slave on Standard and Fast Mode Busses. The l2C Bus Tool complements AVIT Research’... (View)
View full text | Comments | Reading(1242)
ABC OF RECHARGEABLE BATTERIES （5）
Published:2011/8/9 2:07:00 Author:Phyllis
By Gert Helles Charging at high and low temperatures. Efforts should be made to charge at room temperature. Nickel-based batteries should only be fast-charged between 10°C to 30°C (50°F to 86=F). Below 5°C (4TF) and above 45=C (113=F), the charge acceptance of nickel-based batteries is drasti... (View)
View full text | Comments | Reading(2482)
ABC OF RECHARGEABLE BATTERIES （4）
Published:2011/8/9 1:59:00 Author:Phyllis
By Gert Helles Charging lithiumion and lithium-polymer cells Whereas chargers for nickel-based batteries are current-limiting devices, chargers for lithiumion batteries limit both voltage and current. The first lithiumion cells called for a charge-voltage limit of 4.10 V/cell. Higher voltage... (View)
View full text | Comments | Reading(389)
ABC OF RECHARGEABLE BATTERIES （3）
Published:2011/8/9 1:53:00 Author:Phyllis
By Gert Helles Charging nickel-metal-hydride cells Though similar to NiCd chargers, a NiMH charger employs the AT/dt method, which is by far the best method for charging NiMH cells. The end-of-charge voltage decrease for NiMH batteries is smaller, and for small charge rates (below 0.5 C, depending on temperature) there may be no voltage decrease at all. New NiMH batteries ca... (View)
View full text | Comments | Reading(391)
ABC OF RECHARGEABLE BATTERIES （2）
Published:2011/8/9 1:37:00 Author:Phyllis
By Gert Helles Charging batteries A new rechargeable battery or battery pack (several batteries in one package) is not guaranteed to be fully charged; in fact, it is likely to be nearly discharged. The first thing to do, therefore, is to charge the battery/pack in accordance with the manufacturer’s chemi... (View)
View full text | Comments | Reading(413)
ABC OF RECHARGEABLE BATTERIES （1）
Published:2011/8/9 1:15:00 Author:Phyllis
By Gert Helles Basics, pitfalls & recommendations The use of batteries has never been greater. Batteries are becoming smaller and lighter even as they package more and more energy per unit volume. The main driving force for battery development has been the boom in portable equipment such as mobile phones, laptops, camcorders, and MP3 players. The following brief overv... (View)
View full text | Comments | Reading(1651)