DIY audio power amplifier

The 3886 power amplifier was produced, and the pre-level was set to 6N2. From the entire plan to the schematic selection and drawing, PCB, electronics, structure production, and debugging and installation of the whole machine, it was finally completed. The circuits used are familiar to everyone, so I wo n’t go into details here, so I will understand it by looking at the pictures.

Electronic part production

1. 6N2 pre-stage

The schematic diagram uses "no gall" drawings, as follows:

6N2 pre-stage

The PCB is drawn by itself, and the PCB board is produced by thermal transfer (the PCB production process will be described in detail in section 3886):

After the pre-stage production is completed, the capacitors and resistors are all very common materials, especially the coupling output capacitors, and the most common CBB is used first.

Metal oxide semiconductor field effect (MOS) transistors can be divided into N-channel and P-channel. P-channel silicon MOS field-effect transistors have two P+ regions on the N-type silicon substrate, which are called source and The drain is not conductive between the two poles, and when a sufficient positive voltage (gate ground) is applied to the source, the surface of the N-type silicon under the gate exhibits a P-type inversion layer, which becomes a channel connecting the source and the drain. . Changing the gate voltage changes the density of the holes in the channel, thereby changing the resistance of the channel. Such a MOS Field Effect Transistor is called a P-channel enhancement type field effect transistor. If the surface of the N-type silicon substrate is free of gate voltage, the P-type inversion layer channel already exists, and the appropriate bias voltage can increase or decrease the resistance of the channel. Such a MOS field effect transistor is referred to as a P-channel depletion field effect transistor. They are collectively referred to as PMOS transistors.

P Channel Mosfet

P Channel Mosfet,P Channel Power Mosfet,Field Effect Transistor,Field Effect Transistor Symbol

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