Because of the power restrictions, our design options for the flippers were limited. Normally, pinball machines use linear solenoids, which at 12 V and 3 A are pathetic. On the other hand, DC, servo or stepper motors would be challenging to use. In order to achieve adequate speed, power and mechanical robustness, we opted to use linear door-lock m
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otors to push and pull off-axis from the flipper pivot. The flipper design is just fast and strong enough for a well-timed swing, so rather than testing our luck using return springs, we chose to operate each flipper motor in a push-pull configuration, utilizing a bidirectional H-bridge. We operate the motor at full voltage for a predetermined time in each direction, which was based on the minimum complete travel time. In order to prevent blocking code, we utilize timers in the TMRS12 module. Each flipper is constructed from a piece of ½"foam core sandwiched between two identical laser-cut " acrylic pieces, and bound together with glorious hot glue. The main pivot is constructed from a bolt with a smooth shaft section, locked to the playing surface between nuts and metal washers. Nylon washers prevent the acrylic from binding to the components on the bolt. With more time and better resources, we would have preferred to use a true shoulder screw to better control the tolerance stack, however for our purposes this design was more than adequate. In order to make the playing surface removable for easier construction, debugging, etc. , and to control the tolerances of the flipper-motor assembly, we mounted the motors directly to the underside of the playing surface and cut the features for the motors in the same pass/process as for the flippers. The layout of the playing surface and the flipper mounting holes can be seen here....
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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