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Others: A 25 volt (+/- Dual Rail), 5 Ampere, toroidal transformer was used to supply electricity for the … Above you can see the interior of the amplifier which has copper bus bars as per the original design. My project cost me P870.00 ($21.75) all in all.Parts: on Introduction. After some simulation work with Simetrix, I discovered that this is achievable with air core inductors. I don't totally trust my ears/mind (I know how easy it is to form a mental bias regarding circuit alterations), but besides being less shrill when played loud, it also seems to offer deeper bass with more punch.9-19-2010: I increased the zener value from 9.1v to 12v. It's the improved version. Also, parts are available here almost everywhere. You might say it runs cool but if that is the case then I know you are not cranking up the volume. I discovered, with simulations, that I can boost the output power significantly by replacing power jfets LU1014D Q5/Q9 with IRFP240 mosfets Q5/Q6. one question. As I said a while ago, there are some flaws in the part labeling. Then again, it's only a simulation. Thanks, Reply Various measurements of the amplifier on an oscilloscope are shown in the photographs below. I biased up the new mosfet pair with resistor R6 and VR1 (variable resistor VR1 allows me to adjust output offset voltage). That was simple. avg. The heat marks at the end of the legs of the resistors next to the Sprague Orange drop capacitor are from 0.6W metal film resistors which were operating at their thermal limit and were subsequently replaced with 2W metal film types. That's the beauty of living here when you have a hobby of electronics. As a general rule, 2200uF stabilization capacitor is used per ampere but we are used to use 4700uF per ampere. 2 years ago, I saw in your description of the project that a preamp was coming. - 2x3 PCB board (2pcs.) © Dan W and diyAudioProjects.com -, Jean Hiraga's "Le Monstre", a 8W Class-A Amplifier, Jean Hiraga's Super Class-A Amplifier questions, Jean Hiraga's - Le Monstre 8W class-A Amplifier. Last update 5 September 2014. Try to conserve space as much as possible. i might be missing something. Doing this required that I increase the bias voltage resistor value (from the zener) to 100k. Since the transformer doesn't heat up that much and the enclosure is tightly occupied, I just hot glued it to the enclosure. I've read from fellow DIYers that the LU1014D power jfet doesn't appreciate/cooperate with parallel units. 8 years ago I also added a bright blue LED inside to create a cool professional glowing effect in the amp.Heatsink With Fan: )- 2.2uF 25v Electrolytic (2pcs. However, due to the unavailability of the original power transistors, I opted for a more robust output stage using Toshiba 2SA1943 and 2SC5200 complimentary transistor pairs. on Introduction. Share it with us! The addition of these resistors allow negative feedback in addition to bias voltage. since only 2 Ics are required for 62 WPC sterio, i am bit confused here. If your not framiliar with it, you can just Google it, it is extremely common and easy to construct. The LM3886T requires a smaller heatsink, it's plate is conductive, a negative current flows through it, two LM3886T chips cannot be mounted on a single heatink without using a mica insulator, nylon rings and other insulation devices. In this way, about 7dB is gained at 30Hz-70Hz band, and reached about 34db at peak point at 30Hz. This transistor change also allowed me to increase the rail voltage which allows the amplifier to deliver more power. please upload i cant seem to work this project. I can cobble together a euphemism such as "Liquid Gold", but that sounds corny. It's one of the best compact HiFi amplifiers. I always wished to build my own amplifier. Tip After building and listening to Jean Hiraga's "Le Monstre", a 8W Class-A Amplifier, I wanted to build "Le Monstre's" bigger brother "The 20W Class A" amplifier. Instead of 220uF, I inserted my favorite sounding Panasonic capacitor rated at 10uF. I think that's his way of saying the amp has a romantic sound. Also, every other components remains unchanged right? I am a college student taking my engineering majors in BS-EE/ BS-ECE at the DLSU. Above you can see the PCB with all components, note the bias resistors which are 1W carbon types I found they had better thermal stability in this application. The sim looked good, so I drew up a pcb schematic, shown in the black background schematic, above, and then drafted pcb art as depicted two pictures down. I've been posting projects here e…, PCB Layout (fixed width & height).pdf. As you can see, I've bent the heatsink in a "Y" shape for the screws to fit and to be mounted with the LM3886 chips.Binding Posts And RCA Plugs: A light bulb in my head literally exploded and I found myself simming the idea of increasing the gate/source voltage in my amplifier. You can add a potentiometer at the input. Transformer/ Power Supply: I believe this is the time to do it.