250w Power Audio Amplifier Circuit Diagram V3

Konusu 'Amplifikatör Devreleri' forumundadır ve guclusat tarafından 30 Eylül 2019 başlatılmıştır.

  1. guclusat
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    guclusat Tanınmış Üye Süper Moderatör

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    The amplifier is adapted to mount the transistors on the PCB, which only improves the strength and stability of the amplifier, as the conductors that lead to transistors are often not the shortest and have their own inductance and parasitic capacity. In this case, this problem is not necessary, and it is also possible to slightly modify the amplifier´s own compensation. Since the temperature sensing of the diodes is more problematic, here it is comfortably resolved by one transistor attached to the common end transistor cooler. The loss of heat is transferred to the Al angle, which is screwed onto the main cooler. Along with the end transistors, there is also a bimetallic thermostat on the coil, which opens when the temperature is exceeded, and the relay disconnects the speakers to avoid further loading of the transistors. The change from the original design is in the installation of some semiconductors, namely KF469 / 470 resp. MJE340 / 350 instead of 2N3440 / 5416 due to poor cooling and the ability to buy originals. However, I found out when measuring. that the use of MJE 340/350 transistors is just as good, but they have a slightly different sound compared to the KF469 / 470 transistors. Another change is the replacement of the transistor MJ15003 / 4 transistors in a plastic housing type 2SA1943 / 2SC5200. Although these transistors are weaker, but the price is lower than the original, and the parameters of the amplifier remain as good as the original ones. however, they have a slightly different sound compared to the KF469 / 470 transistors. Another change is the replacement of the transistor MJ15003 / 4 transistors in a plastic housing type 2SA1943 / 2SC5200. Although these transistors are weaker, but the price is lower than the original, and the parameters of the amplifier remain as good as the original ones. however, they have a slightly different sound compared to the KF469 / 470 transistors. Another change is the replacement of the transistor MJ15003 / 4 transistors in a plastic housing type 2SA1943 / 2SC5200. Although these transistors are weaker, but the price is lower than the original, and the parameters of the amplifier remain as good as the original ones.

    The mechanical construction is quite simple, the whole amplifier is attached to the Al coal with dimensions of 40x40 mm thickness 4,5mm. then the amplifier no longer needs to be attached in any other way.

    Technical parameters:

    Supply voltage: max. +/50V for 4R load; max. +/65V for 8R load

    Circuit breaker : 2x6,3A fast fuses

    Output power: max. 180/4 R, 8 R

    Frequency response: 15 120,000Hz / -3dB

    Input impedance: approx

    Load Impedance: min. 4R, 8R (depending on supply voltage)

    Protection sensitivity: +/2V

    Delayed speaker connection: approx. 1.5s

    Thermal protection activation temperature: 80 ° C +/5 ° C

    Input sensitivity: approx. 1.4V for full excitation

    Wiring Diagram:

    [​IMG]

    PCB mounting:

    [​IMG]
    PCB Image:

    [​IMG]
    Amplifier implemented:

    [​IMG]
     

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