This project is related to the other tube amplifier projects I have posted. It has more than a casual similarity to the first Push-Pull EL84 (6BQ5) Oddwatt project from nearly two years ago. Both tube amplifier projects use EL84 / 6BQ5 tubes and the earlier one used a ECC802S driver while this one uses 5751 driver tubes. The basic circuits are rat
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her similar, but the new project has a number of differences. Most notably it is easier and less costly to build. The rather large output transformers used in the original project have been replaced by ones that are considerably less weighty and less costly. This alone makes for a $40 to $50 savings. A number of circuit refinements have been included as well. One area of particular note is the higher gain of this new tube amp. This was done to allow the direct connection (via headphone jack) of MP3 players to the tube amp. The earlier project with the ECC802S driver tube did not have sufficient gain for this. The end result is a great DIY project for those of you who need 5 to 7 watts of high quality sound. The amplifier is quite clean from 25 Hz to past 20kHz (see the measurements in Tables 1 and 2 below). There is plenty of bottom end, just not as much as the bigger amplifiers like the KT88 Odd Blocks which use much larger audio output transformers. I was very surprised how well this amplifier sounds. If you don`t exceed the power limits it will provide sound quality that is easy to listen to with great detail and clarity. Warning: This project uses high voltages. Contact with such voltages can cause injury or death. If you are not familiar with high voltages and how to safely build high voltage equipment, then please do not attempt this project. I want everyone to enjoy music and not have anyone harmed in the process....
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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