The prototype for this model is one of a `DSG` class of 24 locomotives built in 1981 by Toshiba for the New Zealand Railways. These locomotives weigh 56 tonnes and have two diesel engines, providing a total of 750kW. In more recent years they have been modified for shunting with a crew of one or two, by the provision of `refuges` behind the headbo
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ards for the safe riding of staff, and a radio-controlled remote system which allows the operator to leave the cab to couple wagons and still be able to drive the locomotive from a distance. The Meccano model is built to a scale of 1:17 and runs on 2. 5" gauge track. Two Richards motors with six speed gearboxes provide the motive power (one per bogie, with only one axle driven on each bogie). The gearing used provides a scale top speed of about 20km/h, while developing enough torque to move six bogie container wagons through four-metre radius reverse curves in a shunting yard. I wanted to add electronics to be able to drive the locomotive in prototypical fashion, `by remote`. The model had to be self-powered, as the pointwork in the shunting yard made any idea of insulated rails for power feeding a bit of a nightmare. The solution came in the form of an infra-red (IR) remote control system from Oatley Electronics. This kit was originally designed for the remote control operation of stereo equipment, and is comprised of a nice handheld remote transmitter unit and an 8-channel IR Receiver Module. The IR Receiver Module is interfaced to a Pulse Width Modulation (PWM) drive unit, a kit from Dick Smith Electronics designed originally as a light dimmer or motor speed controller for use in cars. With a switching capacity of 10A it easily runs the two Richards motors wired in parallel. Power is supplied by two lead-acid gel cells...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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