This is a great old periscope game. Ships pass by in the dark and your job is to hunt them down. When I plugged it in I heard a loud 60hz hum from the audio circuit. The game started but couldn`t aim properly and ships would not explode when hit. Also it looks like someone painted black trim around the edges. I looked at the aiming mechanism. A sm
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all relay attached to the periscope pushes on levers that let the machine know where the periscope was when you pressed the fire button. It`s like a drop target bank on a pinball machine. Non of the levers would operate smoothly and the entire assembly required cleaning and degreasing. The ship unit was dirty and had some broken contacts which explains why no ships were getting hit. I soldered new contacts to the old assemblies as getting parts would not be easy. Removing the main playfield for cleaning is quite the project. I laid the cabinet on it`s face and was able to pull the entire playfield out easily through the bottom of the cabinet. The playfield appears very faded from age. Either that or it`s coated with something. I clean a ton of dirt from it with Windex. The playfield is very brittle and cracks easily. The staples used to attach it all were loose so I carefully drilled tiny holes and tacked it back down. * Updated: It has been confirmed by another Sea Raider owner that the periscope mirror is supposed to have some black paint on it. It`s assumed the reason has to to with some effect. This explains why the periscope assembly is slightly offset. Unfortunately the siting indicator will be off with the paint removed although you will get greater visibility. I opted to not re-install the site indicator. The periscope is also a project to remove. Removing the fire button and take out the front top glass and remove...
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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