This circuit was designed to not fry the 555 timer, this is because I noticed that having the ignition coil share a high voltage contact with a power connector made somewhat high voltages go back and into the 555 timer, thus frying it (I went through about 7 timers before I finally got this to work). So after desoldering a few unused boards, I fou
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nd out that most of the IC`s I removed were photocouplers and I thought that they could be used to isolate the frequency signal appart from the driver that connects to the ignition coil. In a way the photocoupler acted like a relay. For the photocoupler it does not have to be the cosmo 1010, I just used that one because that was the smallest photocoupler that I removed from the board. You can play around with the capacitor and resistor values to see what they do, but I found that this combination gives some of the largest arcs from the igntion coil. The ignition coil is not portrayed as connected to the driver circuit, but it is shown clearly where to connect in the schematic of the tesla coil itself. It is also essential that the 6 volt power source is separate from the 12 volt one, that is why there`s a photocoupler, to completely isolate it. You can see that there is an "audio in" port on pin 5 of the 555 timer, that is optional, but in order to use it, you will have to change the capacitor from a 0. 47uF electrolytic to a 0. 1uF ceramic capacitor (it`s the one with the number 104); all you have to do is connect the output of the audio device to this and connect the common wire to the negative on the 6 volt side, but try not to use anything expensive as I`ve been using a cheap CD player and it acts a bit weird now from being connected, so try not to use your $200 ipod touch or anything like that. The picture of a...
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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