Category Archives: diy
The review is a double review between the Indeed 6N11 Tube Class A Headphone Amplifier Versus the Qinpu Q1 + Indeed L-top 6N3 Buffer Amplifier combo. First off the Indeed Hi Fi Labs 6N11 Headphone amplifier is a Hybrid amplifier using a Chinese military grade class tube, if you see a J on any Chinese tube it means that this is military grade. The indeed amplifier is a combo of the 6N11 tube and the IRF63o Mosfet.
Amplifier circuit these days,We would like to musical you pro the MOSFET 500 watt amplifier is amplifier on my kW shares the same circuit and main PCB design. The barely real difference is the figure of output procedure to the device. We encompass using The IRFP448 design while the MOSFET amplifier 14 O / P procedure. These amplifiers can live used used for almost a few effort with the aim of requires in high performance, low apply din, distortion and brilliant sound quality.
A stereo power amplifier is limited in its output power by two main factors – the impedance of the load and the internal power supply voltage. To obtain more power, one has very limited choices – other than the purchase of a more powerful amp.
The load impedance can be lowered, but if the load happens to be a pair of standard loudspeakers this is not viable, since the impedance is set by the drivers themselves. Increasing the power supply voltage is generally a bad idea, since most commercial amps do not have a wide safety margin with component ratings, and will probably be destroyed if the voltage were to be raised sufficiently to obtain even 50% more power.
In my quest to minimise enclosure size, I stumbled upon a strange concept that allows to effectively halve the equivalent volume (Vas) for a given loudspeaker. In practice this means that the volume of the enclosure can also be roughly halved. The catch is that two identical loudspeakers must be placed ‘in series’, such that the air in between them stays at the same pressure. This configuration is therefore often called ‘isobaric’, ‘isobarik’, or ‘push-pull’. In a certain sense, it turns the two loudspeakers into a single equivalent speaker that has twice the driving force. The most compact way to implement it is to mount the two speakers against each other as shown in the bottom part of the image. It is not often used, for the simple fact that it doubles the costs and power requirements for the amplifier. But in my case, those were subordinate to the strict requirement of minimal size.
My friend Gianfranco was looking for a project amplifier powerful sound and warm. Fixed point had to be HEXFET. I did see some of the proposals with both bipolar and with HEXFET, with some front-end valve but the realization challenging and the relatively high cost of running without anything negative feedback or low feedback had focused on something more affordable. I did not agree. But the end had to have it and then he was master of his choice.
This is single TL072 low noise op-amp tone control circuit. This circuit is a hybrid low-pass, high pass and one-pole circuits with attenuation and gain. This circuit is the solution for limits cost because it requires a minimum component. Here is the low noise Op-Amp tone control circuit. At my schematics TL072 using single supply.
I started gluing up the cabinet pieces beginning with the speaker frame and the top of the cabinet being glued to the side first. Since there are not really clamps to hold these pieces in place, lay the cabinet side on the floor or a sturdy table, glue both pieces and fit together. Set another board on top of the glued pieces and weigh it down with books or something similarly heavy I used cans of paint, lots of them! Do both cabinets at the same time. Be absolutely certain each board you glue is perpendicular to the side panel ? check it twice. Errors here will ruin your project. Remember that you cannot have any gaps between boards in your enclosures. I did not use any screw or nails in my construction, so it limited me to how many pieces I could glue together at a time. Usually I glued one piece per cabinet side, waited 8-12 hours and glued another. You?d be surprised how fast they went together.
The low noise preamp featured is very straightforward to make on the PCB, and has an innovative tone defeat function. Rather than completely disable the tone controls, they are massively de-sensitised, and when “defeated” have a maximum range as shown in below. This can be increased if desired, so you can have two tone control settings, one with the normal 10dB boost and cut, and the other with a very subtle 3dB boost and cut – this will be enough (surprisingly) for very minor adjustments such as you might need for day-to-day listening.
75Watts amplifier does not claim “state of the art”, and in fact, the basic design is now more than 20 years. It is a simple amp to build, uses standard parts and is stable and reliable. The recommended design is a slight adaptation amp I originally designed many years ago, the red dog were built., most of them were small PA or instrument amplifier power, but words have found their way into home hi-fi. amplifier is capable of driving 4 ohms, but it begins, however, the limits of the transistor, even when used at 4 Ohms found very few errors.