The amplifier shown in the schematic is a complete working audio amplifier descr

Question

The amplifier shown in the schematic is a complete working audio amplifier described here:

http://diyaudioprojects.com/Solid/Jean-Hiraga-Le-Monstre/

Your job is to identify which of the 8 transistors in the amplifier are being used in CS or CE configurations.

Note that Q1 and Q2 are JFETs which is why they have a funny symbol. For the purposes of this questions you can think of Q1 as an NFET and Q2 as a PFET.

+12V 12 V 10 5W 1 kg 2 ko 2SB 716 2 SC 1775(E) Q5 2 SK 170 Q7 2SD844 Q1 Q3 2 kg Entrée 1,2 kg 2200 100 10 2 ka Q8 47 kg 2 SJ 74 Y) 2SB 754 Q6 2SA 8720E 2 SD 756 1 ka 2SD844 258 754 2 V 2 SB 716 2 SD 756 2SC1775(E) 12 v 2SA 872(E) 2SK 170 (Y) BCE EC B ECB DGS

Explanation / Answer

Explanation:

Q1 is used in CS configuration because at the input stage we need high impedance.

Q3, Q7, Q8 are in CE configuration.The reason is when we carry small signal analysis of this circuit we get

output at the collectors of these transistors with base driving.

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