Quasi Complementary means the final output transistors are on the same configuration. On the Elliott Sound Products site there are several articles about basic Quasi Complementary amplifiers. The do work well as audio amplifiers, provided the circuit can provide them with enough drive current and the feedback loop is good. By the late 70's they had been replaced by higher beta transistors in nearly every audio application. Not the most efficient, yes, but it won't be much hassle xDĢN3055's were used in audio because they were stable and cheap. As of the power supply, I can easily find an old stereo system and salvage its power supply transformer, from which I can design my own linear supply. That may make it suitable for other uses, eventually. It's almost a full-range amplifier with bass-boost, come to think of it LOL. My project can take the form of multiple circuits (say one circuit per driver, thus 4 circuits), this way I can give both the bass and full-range their own on/off and volume control if necessary. So, to summarize this, I'm not sure which amplifier circuit(s) I should choose among all the schematics I can find on the net. For the bass driver(s) however, I'm pretty much stuck to the four 2N3055s I got, if I don't buy anything that is.
#More powerful 2n3055 transistor drivers
I assume the amplifier for the full-range drivers can be built using parts that are fairly easy to find. As for the drivers themselves, I already have a pair of 80s Diatones that sound particularly good with higher frequencies. Since connecting anything on my piano's audio output automatically disables internal speakers, I'm going to need an amplifier circuit for another pair of speakers covering full-range. They sound just fine, but the bass sounds a little weak. They're not exactly big in terms of physical size, but I'm fairly sure they could provide more powerful bass for my Yamaha NP-31 electronic piano, which has a pair of 6W speakers.
#More powerful 2n3055 transistor tv
Then while searching information about them I saw they apparently used to be among the top-notch transistors for audio amplifiers in the 60s! A few days later I was examining the frame of an old Toshiba projection TV to see if the boards were worth salvaging, then I noticed the 15W speakers. The circuit boards didn't have much interesting stuff, but I did grab the transistors. This is an adjustable high current regulator circuit that the output voltage can be adjusted using a 5K potentiometer.Here's the thing: This week I found a nice big power supply using four 2N3055s. Current Boosting Using a PNP Power Transistor (MJ2955)įigure-1 shows the schematic diagram of the circuit. This problem can be solved using a pass power transistor. Overload protection remains functional even if the ADJUST terminal is disconnected.” This information proves to us that this cheap 3-terminal device is suitable for many applications but it comes with a drawback for power applications and that is the limitation of the regulator’s output current handling (1.5A in the best conditions). It includes current limiting, thermal overload protection, and safe operating area protection. The device features a typical line regulation of 0.01% and a typical load regulation of 0.1%. It requires only two external resistors to set the output voltage. In this article, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.Īccording to the LM317 datasheet: “The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. The output voltage of the regulator can be adjusted from 1.25V to 35V. LM317 is one of the most popular adjustable regulator chips.