"Electronics News" since 1992, have introduced the group's internal circuits and chips used in this two chips cheap, easy to use, easy to buy the market. Installed in the process of discovery is not very satisfactory results, according to the press in front of the guidance improved several methods, such as "e" in 1997 the first six will be STK6153 emitter output, coupled with measures such as dynamic bias, In terms of sound quality is still on the plain. Later, do not have to be abandoned STK6153 that the general quality of the device, the adjustment can not be static, room for small hands to retain STK3048 incentive for audio amplification designed a simple circuit.
Actually listen to sound exciting, and the Hushan console compared to the intensity, flexibility, and other aspects of the subjective hearing on the difficult points Zhongbo, with so few years to expand the machine finally feel satisfied.
By Q1, Q2 (2SC2275, 2SA985) for voltage amplification, Q3, Q4 (2SC3280, 2SA1301) for the current amplification, Q5 (2N5551) for active bias. Checks are correct, electricity test machine, to measure the mid-point of potential output, the machine for 20 mV (50mV as an amateur indicators do not hurt Tagaytay), W1 for the last stage of the high-power quiescent current 100 mA around so that the left and right Similar to the radiator heat (due to bias dynamic, static, heat, the radiator to the machine).
The machine components are very common, ordinary transformer is the E-type core, at least 200 W, electrolytic capacitor 10000 μ F, the remaining components are common. Useless to start Q1, Q2, quality and results of almost 6153, or 3048 of the reasons for the load with limited capacity, lack of incentives. Q5 limited role. With Q1, Q2 after the dynamic bias on the merits of show, on the power to guarantee, Q1, Q2 can also be used in the power of the other, such as the C2073, A940, and so on.
The audition is used in the low-frequency Li Nan hegemony shelves me, this particular test amp box, is the main strength and flexibility. Canada began the tone network, attend an audition in the speaker's performance is not neat, despite the deep bass, but was feeling chest Zhende, nausea, it is not a good thing disposal to CD straight split amplifier, the sound quality is pure and transparent .
Because of this power, the need to install a speaker protection circuit.
The circuit I simply can no longer simple, can be said to be classic. By 3048 due to the former amateur level with discrete components under the conditions of very troublesome, 5532,1057, and some other operational amplifier output voltage is too low, did not expect to use cheap but STK 3048.
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