Single-ended amplifier for no magnetic output transformer ----- Special Class A Amplifier

Keywords: circuit diagram of a single-ended amplifier Author: Jiang Jianbin Circuit shown in FIG. LED × 3 for biasing the power transistor (turned on only high voltage VGS of the field effect power transistor concerned, such as MLE20, R413, etc. .VG3 smaller power tube slightly modified according to actual conditions). Power tube quiescent current taken between 500mA ~ 2A (note heat), the same current and the quiescent current of the constant current power tube pipe. Since the current direction of the two tubes (in the two sets of coils), the resulting magnetic field is canceled to each other, thereby eliminating DC magnetization. Another variation of the circuit as follows: the amplification of a common set of bias constant current transistor (in this case two power transistors to be strictly paired) easier to debug the circuit. You can try to disconnect the power supply point A, point B is connected. To see if the sound quality has changed. Two circuits do not use a single-ended amplifier circuit filter inductance necessary. Actual audition signal to noise ratio is high. Has been finished in January, the circuit is very stable work. Sound sweet. Very low balance. High SNR and high-quality push-pull machine having a single machine side machine, while the output of children without bovine magnetic gap. Reduce the difficulty of making. Contributed to the effect of the constant current source (input terminal connected to the source or short. Speakers close to the ear to hear a slight little noise). The price paid is more than double the single-end machine static power consumption.

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