This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with a microprocessor controller. This amp generates around 1000 volts, and the power supply d
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escribed below can deliver a lot of current. The result is that there is a real hazard from the voltage and energy available. DO NOT TRY AND BUILD ANYTHING LIKE THIS UNLESS YOU ARE COMFORTABLE WITH HIGH VOLTAGES, AND ARE FAMILIAR WITH THE RISKS! Don`t come looking for me if you start a fire or electrocute the cat! When working on high voltages, keep one hand in your pocket, and NEVER LEAVE ANYTHING TURNED ON UNATTENDED! You`ve been warned. The main peculiarity of the amp circuit, I guess, is the single-tube pentode driver. I experimented quite a bit with the 12HG7 and 12GN7A tubes, both of which are high Gm pentodes designed as video output amplifiers for color TV`s. They are amazing devices, capable of providing very low distortion, high gain, and low output impedance all at the same time. much better than you can get with any single triode I`ve seen. The driver has a very nice harmonic profile, with the 3rd harmonic always below the 2nd. At lower levels, the 2nd is about the only harmonic that`s measurable. For some reason pentodes seem to have the reputation for creating more high-order harmonics, but it`s simply not true in a single-ended design. This driver tests, and sounds, better than any of the possible two-triode drivers I tried, like 6SN7 direct-coupled, or 6SL7 SRPP. It also does much better than a 6C45pi-E. I also tried these tubes triode connected with a CCS, and they did well that way - about the same as 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....
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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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