This Hi-Fi amplifier circuit is suitable for a lot applications like general purpose amplifier, guitar amplifier, keyboard amplifier. The amplifier can be also used as a sub woofer amplifier but a subwoofer filter stage has to be added before the input stage. The amplifier has a low distortion of 0. Circuit diagram.
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The amplifier has a very pleasant sound in the mid-eighties was patented. Since then, the element base has Since then, the element base has changed quite a lot and it has been possible to simplify the circuit, preserving the idea itself and getting the best characteristics without compromising reliability.
The circuit has a preliminary buffer voltage amplifier made on the TL op amp and a two-stage push-pull power amplifier. Both amplifiers are covered by their local negative feedbacks: RR9 and RR The gain depends on the ratio of the ratings of these resistors, and in this case it is chosen in such a way as to obtain minimal distortion in this cascade.
Changing the ratings is not recommended R9 and R10 can be from 27 to 43 Ohms, optimally — 33 or 39 Ohms. Since the last stage operates in the amplifier mode, entering the saturation mode, the resistance between the output of the amplifier and the power source becomes the minimum possible 0.
It is this factor that allows MOSFIT to have a much higher efficiency at the output compared to traditional amplifiers with emitter followers, since the amplitude of the output signal is only a few volts less than the supply voltage.
Within small limits, you can change R2 to obtain the required gain, but do not exceed 37 dB R2 should not be less than Ohms The list of elements necessary for self-assembly of the amplifier is summarized in the table below.
Terminal transistors are installed on the radiator through electrically insulating heat-conducting gaskets, having previously lubricated the flanges with heat-conducting paste.
However, you can do without gaskets, but it should be borne in mind that the output signal of the amplifier will be present on the radiator, which can cause the excitation of the amplifier, the radiator must be isolated from the case.
In fig. Of the features of the amplifier, it should also be noted that the flanges of the terminal transistors are electrically connected between themselves and the output of the amplifier, so when using small heat sinks with forced cooling, you can not use dielectric gaskets, but rather isolate the radiator from the case. When using heat sinks with natural air convection, the dimensions of the latter already become large and it is not recommended to supply an amplifier output to it — too much interference will be created, which, if the boards are installed incorrectly in the case, can cause the amplifier to excite, even despite its rigid stability.
Both variants are loaded on the speaker equivalent yellow rectangle and do not use ideal power supplies with their own resistance. Nevertheless, the IRFIRF in the simulator completely coped with the tasks assigned to them, and can also be used in the amplifier as terminal transistors. However, when using TO cases, one should not forget that the power of one TO case should not exceed 60 W, unlike the TO case, up to … W.
In other words, when using an IRFIRF as a terminal transistor, it is not recommended to shoot more than watts from an amplifier with four pairs. Figures 5 and 6 show maps of currents flowing through each element of the amplifier in standby mode no input signal. This is worth mentioning separately: this amplifier does not have any current-stabilizing chains, therefore, when the supply voltage changes, the operating modes of the terminal stage will also change — with an increase in the supply, the quiescent current will increase, with a decrease, it will decrease.
For this reason, it is recommended to use the amplifier as a broadband with a high-quality supply voltage, or as an amplifier for a subwoofer and setting the quiescent current within 15 — 20 mA. As thermostabilizing elements, VD3-VD4 diodes are used, which can be installed both on the radiator and remain on the printed circuit board — instant heating does not occur anyway, therefore the heating speed of the board installed above the radiator is quite enough.
Mosfet IRFP 9240 hàng tháo máy zin
Any suggestions on where the error could be located? F1 and F2 are safety fuses. Technical Details Instead I would like you to use separate filters and rectifier for each amplifier, you mount bridge rectifier and filter capacitors of the value shown in each circuit board. Hi Harry can be used. Get fast, free shipping with Amazon Prime. This amp will work, but you have to add a filter circuit at the input.
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