One thing your not suppose to do to an old radio or TV that hasn`t been run for many years is just go and plug the thing in and flip the power switch on. The best thing to do is use a device called a Variac which allows you to slowly bring up the power to a full 120 volts over the course of many hours, sometimes days. You start it out about 20 volts and every few hours up the control dial another 10 volts or so and watch
Click here to download the full size of the above Circuit.
for any adverse reactions (you know, adverse like smoke, fire, explosions, etc) until you reach a full 120 volts, just like normal house voltage. But I noticed that this TV was already plugged in, so I assumed that someone else has already tried it out at the sale today, I decided to just let it rip. After warming up a minute the TV came alive with near perfect sound and a very blurry, rolling, out of sync picture. Well that`s a good sign, at least the picture tube worked. I figured it would be a fun new learning experience; I always wanted to know how a TV set worked and now was my chance. I bought the set for $30 and schlepped it home. I have restored over fifty vintage washing machines, but TV`s were a completely different animal with more hazards involved like extremely high voltage and dangerously high vacuums inside the glass picture tubes, so I needed to be sure about what I was doing. I searched for a modern book on how to restore old television sets, but like appliances, found nothing that been written on the subject, so I spent the next few weeks reading all the old 1950`s TV repair books I could find. At first, I only understood about one out of every ten words in these highly technical books, but as I read the same thing written by different authors, who told the same story a slightly different way, it all started to make a little more sense. I also went downtown to the main library to get a copy of the...
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.....
characters left: