HO WALKAROUND CONTROL - THE BEST YOU CAN GET!

1.5 AMP PWM WALKAROUND THROTTLE

HO VERSION - JUST WATCHING THIS LISTING WON'T GET IT ON YOUR LAYOUT!

• DC PWM output for absolute control of your locomotives

• Now available in in 3 versions - Z scale - N scale - HO scale - All with 1.5 amp output

• 8' tether cable - only 4 connections required - almost impossible to connect incorrectly

• Close to 2,000 sold throughout North America - the #1 choice for large clubs!

• Requires 12VAC to 18VAC power - this can be derived from your existing power pack's "AC ACCESSORY" terminals

• All circuitry is self contained. No extra parts required! Designed for "one handed" operation!

• Unconditionally guaranteed for 1 full year!

• S&H $7 to North America and $8 to International destinations. 

The new popular black on grey scheme is the product you'll receive

Some of you will probably be asking " Why PWM?" and "What's PWM?". The answer is efficiency. The majority of model railroad throttles produce DC output voltage which is more or less proportional to the throttle's knob position. While there is nothing wrong with this in about 80% of the throttle's upper voltage output, it tends to allow motors to heat more than they really need to at slow speeds. This is due to slow ripple voltage rise and decay times at low voltages. Sound a bit technical? I'll explain a bit without getting too deep. Oh, by the way, PWM is an acronym for Pulse Width Modulation.

Let's look at a rule of physics. "Things like to keep doing what they're doing." If a locomotive is sitting idle with no power applied, it's actually doing something. It's sitting there. When you "give it the juice", a fair bit of power is needed to get it going. Once it gets going you can back off the throttle setting. Now it's doing something else. It's moving. To keep it moving takes less power that it takes to get it moving.

Now, the funny thing is that I have never seen a 12VDC motor start to rotate with 1 volt applied to it. It might start to spin at around 3 or 4 volts. Once it starts to spin it will "jump" to life and rotate. Now that it's rotating less power is required to keep it going. You can even slow the RPM of the motor by decreasing the voltage to it. But that same voltage setting would not be able to get the motor spinning in the first place. With conventional throttles at low voltages, something happens many times per second. The throttle produces a dirty DC wave component called "ripple". Ripple is a mixed blessing. It helps to "kick" the motor around at low speeds but, the very nature of the ripple component dictates that wasted energy at low voltages is converted to heat in the motor windings as the motor tries to overcome motor bearing friction, gear friction and the weight of the locomotive itself. You can prove this with your most stubborn locomotive. Try setting it on a piece of track and turn up your conventional throttle until it starts to creep. Then carefully back off the throttle until the locomotive "stalls". Let it sit there for about a half hour or so. Then pick it up. The safe money is that it's warm, maybe even hot! That's because the voltage you've been feeding it for the last half hour or so was not sufficient to get the motor spinning and the motor is still working to try to spin. The energy expended has been converted to heat. Wasted energy.

Pulse width modulation throttles overcome friction and inertia by "kicking" the motor with full throttle voltage for a short period of time. The voltage rises to full amplitude very rapidly and shuts down to nothing equally as fast. No slow rise and decay times mean less motor heating. But even better, the motor starts to spin immediately and PREDICTABLY. PWM throttle settings produce repeatable and predictable speed changes without jump starts and motor stall at low speeds. This means no more overcompensating on the throttle control knob in the yard when you're trying to couple to a cut gently or when you're trying to take up coupler slack.

See what else is available in model railroad electronics. Cut and paste this URL into your browser http://www3.sympatico.ca/kstapleton3/Index.html to get a look at some of the finest model railroad electronics available anywhere. The schematic diagram and DIY information can be found at http://www3.sympatico.ca/kstapleton3/851.HTM 

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