Digitrax SoundFX SDN144A1 Посібник - Сторінка 4

Переглянути онлайн або завантажити pdf Посібник для Конвертер мультимедіа Digitrax SoundFX SDN144A1. Digitrax SoundFX SDN144A1 12 сторінок. Drop in mobile decoder for atlas n scale sd60/40 and similar locomotives

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7. Connect to active DCC track power from a compatible DCC system and

select the factory default address 03 to enable sounds for testing

8. Be sure F8 (mute) is OFF to allow sound output, and after track power is

applied and the engine "starts", press F1(bell) or F2 (whistle/horn) ON to hear

these associated sounds. When removing the shell, note that the speaker is a

snug fit and do not pull on the speaker wires to remove the speaker from the

shell.

9. Customize sounds by programming Sound CV's to adjust the desired con-

figurations, as shown in the following tables of Sound FX CVs. CV60=0

sound scheme is a SD60 and CV60=1 is an SD40. Other locomotive sound

projects may be downloaded from the Digitrax web site and conveniently pro-

grammed using a PR3 programmer. This "A1" form-factor PCB may be used

in a number of other N scale locomotives by applying a little modeling ingenu-

ity.

Speaker Mounting and baffle or enclosures.

The sound performance of any attached speaker(s) is greatly affected by the

mounting system and required baffle or rear enclosure space. Depending on

the locomotive model and construction and speaker chosen it may be necessary

to modify the frame or parts of the internal shell to make room for one or more

speakers and enclosure.

For the Atlas N scale SD60 installation shown here the whole body acts as a

sound baffle once the shell is in position. To optionally increase the sound vol-

ume it is possible to drill out the three rear fan details and replace these with

painted BLMA brass fan parts that permit the improved venting of sound.

Obviously the space inside this N-scale locomotive is limited since the frame is

configured for maximum weight and pulling effort, and the installation shown

here is just one variation of the possible locations for a speaker.

The baffle is used to isolate the speaker diaphragm front sound waves from the

"out of phase" rear sound waves. This minimizes sound cancellation, particu-

larly at lower frequencies. For most efficient sound generation, the cubic space

of the baffle should be as large as practically possible, and the baffle walls

should be acoustically rigid so not to allow acoustic interference.

For example, you can wire in the SDN144A1 in a modern HO-scale locomo-

tive with a high-efficiency can style motor as long as the stall current is less

than 1 amp at the track voltage in use. In this case it is possible to change to a

larger speaker(s) that has a "high bass" or similar enhancement. For best oper-

ation it is useful to connect the optional 100uF storage capacitor or larger value

to help overcome pickup dropouts due to dirty track etc.

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