Tag Archives: Class-A
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.
The hybrid amplifier is a two stage, DC coupled, single-ended Class A amplifier, capable of delivering approximately 30W 8 ohms into a store or a load of 15W into 4 ohms. The output power can be increased by parallel connection of several MOSFET output devices and the associated power source. Devices in parallel to increase the damping factor and reduce the dependence of the load impedance. A stereo amplifier with two outputs per channel MOSFET devices more than 50 plus 50 W pure Class A power have used at 6-8 ohm loads. With its class to operate under these conditions the stereo amplifier dissipate over 300W, so that the heatsink correctly (at least with a thermal resistance of 0.2 ° C / W) and an appropriate forum, well-ventilated should be used.
The Audiphiles MOSFET Amplifier of course there are some active elements into an amplifier, to win the order as a “booster” are. I was always be impressed by the easy-ended tube amplifier, was single. Only one valve, one or two resistor and an output transformer. So I fashioned a FET amplifier in the same simplicity of design. A MOSFET audio quality, a few resistors and capacitors and a heavy supply of filtered well. The diagram of the amplifier.
I was a headphone amplifier in need of high quality for many reasons, and decided to build Amp SDS Labs phone. This is extremely useful project in a way that is fully documented and includes fixed PCB, BOM and buildings – it is so easy to build and it looks great.
The project began when a job has been to clone the famous Krell KSA-50 based on the diyaudio.com after a fruitful discussion and one thing led to another and from a first printing of the cards were Delta audio. I received a series of plates designed and placed components in the output stage, a soft start, temperature monitoring, and the rest of the amplifier.
The circuit is all about an amplifier that can deliver an output of 60 W during operation in Class A mode.
Class A terminology – refers to a stage where the bias current is greater than the maximum output current, so all the output transistors always conduct due to its linearity and low distortion MPSA56 power – with a PNP transistor as a rule in a TO-92 package sealed and used for amplification and switching performance with low power at 500 mA maximum, low voltage of 80 V maximumMJ802 – a transistor current silicon NPN TO-3 package and an excellent environment operating safely as an output device in complementary audio amplifiers to 100 watts music performance by channel2N6515 use – a high voltage NPN transistor in a package with a hole 150 ° C junction temperature.
After a century of research on the internet, I finally decided to build “Simple JLH Class A amplifier“. The amplifier circuit was designed by John Linsley Hood years 1969 and updated in 1996. Later it was by a group in one you can improve on diyaudio.
Before getting into the thick of it, we had to clarify that the described circuit is not really a circuit completely original. This is an improvement of a circuit dating back nearly two years, and sold as a kit under license in Japan. This amplifier has met with great success for its cost, ease of installation and its compact dimensions. For French readers, we have made ??some improvement to the original scheme. It is characterized by a symmetrical supply voltage slightly higher: + / -25 V and the use of complementary transistors different. In fact, the voltage value is not very critical since it may vary for this scheme, 19 to 26V, without modification. In terms of transistors, the original diagram (Fig. 1) uses the complementary pair 2SA539/2SC815 close to that used in our implementation, 2SA872A/2SC1775A (cover page). The latter, more recent, however, is more efficient on noise parameters, and Ft Cob In addition, the higher supply voltage has a slight power boost, from 20 to 21 W without distortion, while the improved circuit is limited to 18 W under these conditions, 20 W maximum at the edge of clipping, that because of the decrease in power + and – 18 V. This decrease has on many other criteria many advantages, that is why we have chosen.
J162 K1058 MOSFET amplifier circuit. Welcome to Free dot com circuit we want audio amplifier circuit, as amp is currently composed of two completely separate mono amplifiers for each channel has its own power supply, inter-channel crosstalk zero, a common phenomenon in amplifiers, the same the diet. 40VAC at 640VA to evaluate the performance of a transformer in order to obtain full 40VAC – 0 -.
This is a stereo class A amplifier. The design is reference to the legendary JLH amplifier original 1969 version. 1 board / channel, the price is for 2 boards
DIY kit only. You need to weld the components and board by yourself—schematic will be attached.
Components have great influence to the sound performance as its simple design. Component with deferent kind or quality makes a different sound performance. We test before and chose the much more suitable ones in capacitor, and test result for your reference.