begin the Fast Charging mode.

The Benchmark IC will constantly monitor the pack and turn off the fast charge when the cells are charged just to full capacity. Once this is accomplished, it will periodically “top off” the cells with a high current burst, and allow a slight trickle charge to flow.

Unfortunately, about the only thing to do for this initial check out is to watch the lights blink - but it is also a good time to “measure” the capacity of your cell. Start “timing” the charger just when it goes into fast charge mode.

Knowing the charge current rate (whatever you previously set it up at) and the time for a full charge, (Amperes • Hours), you can get a fairly good approximation of the health (capacity value) of your batteries.

What about those “mystery” batteries ?!

Often times the batteries are “hidden” in elaborate packs designed to fit in video cameras, cordless phones, or RC racecars. The easiest way to determine the number of cells in such a pack is to take the nameplate voltage and divide by the number 1.2, the voltage of a single cell. For example, a 7.2 V pack contains 7.2 ÷ 1.2 = 6 cells.

It can also be quite frustrating to connect the charger to these “oddball” type packs. An inexpensive design idea is to fabricate your own holder with assorted bits of wood and plastic. Surely a kitbuilder like you already has a “junkbox” full of those priceless gems just waiting to be put to use to hold your batteries. For example, an old discarded relay usually contains some high current spring loaded contacts that make great connecting terminals for such packs.

Be absolutely sure that you have the proper polarity identified on the battery pack. Most are marked with a sticker or mark in the plastic case. If you can’t figure out the charge capacity, go to your local home electronics store. Ask about replacement cells; most likely the salesman will know what you need.

BATTERY WORKOUT

To keep your NiCad cells at their peak capacity, here are a few suggestions:

1)Alway deep cycle your batteries. Run them until they just begin to quit. It is best to depress the “discharge” pushbutton after you initially hook up the pack to Dr. NiCad.

2)Even when not in use, periodically “top off” the pack. This is also

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Ramsey Electronics DN1 manual What about those mystery batteries ?, Battery Workout
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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.
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