Introduction

With today’s ever changing technologies, more appliances depend on battery power to enable their use. While this gives us greater freedom, it is often at the high cost of purchasing portable energy, or batteries, to run our portable electronic gismos. Consider the cost of energy from our local electric

company, about 8¢ for a KW hour, or about 450,000 joules of energy for a penny. On the other hand, that 500 mA-H NiCad that you just purchased for about $1.75 can only supply 2250 joules of energy; that's about 13 joules for 1 cent. So it’s fairly easy to see that energy costs about 35,000 times more when it’s in a battery.

Nobody likes the idea of throwing all those batteries into a landfill. That's the reason for the recent emphasis on using “green” rechargeable cells. If a set of NiCad cells lasts you for a few months, they can save the equivalent volume of themselves many tens or hundred times in the trash. This is not only good for the environment, it’s also great for the wallet!

Nicad rechargeable batteries have been around for years, but there are a few real disadvantages in their use. They usually require a long time (sixteen hours) to recharge. This “trickle charge” arrangement is quite common because it is much cheaper for the original product manufacturer to produce (the entire battery charger is typically a couple of rectifier diodes and a current limiting resistor), and works well given the draw back of a long charge time.

Another disadvantage to the “plug-in wall transformer charger” is that the charging cutoff action is regulated by the heat produced by the cells’ chemical reaction when recharging. If you’ve ever opened up a rechargeable pack you have probably seen the thermal shutoff “mystery part” connected and mechanically touching one cell of the battery pack. While this will help if you leave your appliance charging for several days, notice that it is sampling only one cell in the pack, and assuming that the rest of the batteries are “behaving” in the the same manner. Also, since the ambient temperature can change (i.e.recharging your cordless drill in the cool garage or basement, or your two way radio on the hot seat in the car), this heat sensing approach can vary considerably from undercharging your pack to overcharging until you “cook” the electrolyte solution right out of the battery.

Often times we cannot wait for the full recommended charging time or do not use the batteries until they’re completely “dead”. When this is repeated, the uncared for battery or pack can seem to “run out” rather quickly. This effect is caused by not completely discharging the cell before it is recharged and is known as the memory effect, since the battery appears to memorize the amount of energy it is called upon to produce.. By not completing the

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DN1 specifications

Ramsey Electronics DN1 is a versatile and compact digital audio transmitter that caters to a variety of audio transmission needs. It is designed for hobbyists, educators, and DIY enthusiasts looking to create their own wireless audio systems. The DN1 offers a reliable solution for transmitting audio signals over short distances without the clutter of wires.

One of the main features of the DN1 is its ability to transmit audio in the FM band, which provides clear sound quality and minimizes interference. The device operates at a frequency range of 88 to 108 MHz, allowing users to choose the optimal frequency for their specific environment. This adaptability makes it suitable for applications like personal broadcasting, classrooms, or small events.

The DN1 is equipped with a simple-to-use interface, featuring adjustable audio input levels and an LED indicator for power and modulation status. It supports both mono and stereo audio inputs, making it a flexible option for various audio sources. Users can connect the transmitter to devices such as audio players, microphones, or computers, which allows for seamless integration into existing setups.

Another significant characteristic of the DN1 is its compact and lightweight design, making it easy to transport and mount in different locations. Its robust construction ensures durability, making it ideal for both indoor and outdoor use. This makes the DN1 an excellent choice for users who need a portable solution for DIY projects or presentations.

The device operates on a low-power consumption model, which is not only environmentally friendly but also cost-effective. It can be powered by a standard 9V battery or an external power supply, adding to its convenience and versatility.

In terms of performance, the DN1 boasts a transmission range of several hundred feet in optimal conditions, ensuring that audio signals remain strong and consistent even in larger areas. This range, combined with its ease of use, makes it an appealing option for those looking to broadcast audio without the limitations of wired connections.

Overall, Ramsey Electronics DN1 stands out as an innovative transmitter that brings together user-friendly features, excellent audio quality, and practical design. Whether for personal use, educational purposes, or event hosting, the DN1 meets the demands of modern audio transmission needs, allowing users to experiment and expand their audio capabilities with ease.