Onkyo-ASV610PRO-avr-sm维修电路原理图.pdf

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Rectangular box shows DVM This typical circuit often seen in amplifier and power supply is a common approach to general application circuit design. This circuit is a normal configuration often used in amplifiers having an inverted output. The output of Q1 at its emitter shall have a loss up to 650mv depending on the transistor gain. The circuit shall have an output proportional of input, less switching loss. The bias voltage is dependant on R3 value, which also defines Q1 emitter output DC voltage. Other condition may exist depending on the value of R4 and R5. Fig2 Fig3 Fig4 Unlike Fig 1, 2, and 3 fig 4 shows non- inverting output whose collector voltage can be switching opposite of the vb for Q1. The higher the vb at Q1 the lower the collector voltage will be. That is because more biasing will cause Q1 to conduct more as the current flow through R4 is nominal compared the current to be drawn through R5. RadioFans.CN 收音机爱 好者资料库 PNP transistor used with Positive Power supply to Emitter and +ve biased. Rectangular box shows DVM In this kind of configuration the transistor is biased by Positive voltage. Do to the characteristic of the PNP transistor reaction to a Positive supply at the emitter, the collector voltage will retain above the 600mv minimum switching voltage. Even when the vb (base bias voltage) reaches near 0vdc, the lowest the collector voltage will get is 650mv. Such configuration of a transistor is good where a circuit is expected to operate at high frequency and need not idle below the switching voltage. It also provides none inverting output. The transistor output is dependant of vb value, which can be trimmed by the resistor R3. Such circuit is often used in video and like high frequency buffer circuit. It can also be used as sensory circuit or low-level amplifier. 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Solution: PCB means Printed Circuit Board In early 1960, most (if not all) electronic assemblies were assembled in a point-to-point fashion. All of the components were strung through the air, literally supported by their wire leads. Big parts were bolted or soldered to a heavy steel chassis and the smaller parts were strung between them. These assemblies proved to be nightmarish to assemble Q1 is biased by the supply voltage -ve, variable depending on the value of R3. In such configuration Q1 can be turned off completely. The output of Q1 collector is equal to the vb less the 600mv loss within the transistor. Output should be expected to invert. Such configuration may be used as Voltage dependant switching and control such as amplifier bias stage, ALC, and sensory circuits. The ability to vary the output of Q1 collector form zero to its maximum given supply voltage less the component switching loss, makes the circuit widely usable in the audio, video and general power supply manufacturing industry. The configuration is normal for PNP transistor with a negative voltage supply at its Emitter. RadioFans.CN 收音机爱 好者资料库