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File name n-channel amp.pdf

Construction Notes for the N-Channel Amplifier Module Introduction The N-Channel Amplifier is about the simplest design one could use and still have good performance and a push pull output stage. The n-channel is basically a two-stage amplifier, Consisting of differential error amplifier stage and Driver/Output stage. The other circuits are a 6ma current source for the first stage and a current source for the IRF610 phase splitter and temperature compensated bias voltage source for the o/p stage power MOSFETs. It is worth noting that just about any industrial Power mosfet can be used in this amplifier. The best ones to choose are the one's with voltage ratings of 200 volts and greater. The Gate Capacitance of these Vertical type MOSFETs doesn't appear to affect the performance of this amplifier. I have used MOSFETs with Gate C's as high as 4000pf per device without any affect on performance. Provided that you follow these instructions to the letter. You will have no trouble getting going the N-channel amplifier. The Objective performance or sound quality of this amplifier is quite frankly second to none. There just seems to be something about amplifiers that use N-channel MOSFETS in their O/P stage. With the new soon to be released 6 Channel MOSFET amplifier, it uses n-channel devices only in its O/P stage and the sound quality is something to be heard. The Error Amplifier Stage The first differential stage is made up of Q2, Q3, Q14, Q15, R4, R5, R9, and R10. Q2 and Q3 form a differential amplifier. Q14 and Q15 form a current mirror load which forces equal current sharing in this stage. The resistors R4, 5, 9, and 10 provide degenerative gain fold back for the differential pair and current mirror respectively... C3 provides i/p DC decoupling. R22 and C4 form a low pass filter, which sets the maximum i/p frequency at about 100khz. R25 sets the overall i/p impedance. R28 provides power ground decoupling from signal ground and helps to prevent ground loops. Q1, Q4, C5, E2, R1, R15, and R16 form the current source feeding this stage and the current is set at 6ma. The Phase Splitter Driver/Output Stage The next stage could be seen as a separate stage to the output stage but is actually part of the output stage. Q13 IRF610 forms a phase splitter, where the o/p of the Source pin is non-inverting and the o/p of the Drain pin is inverting. R17, R18 having equal values ensure the splitter has the same voltage swing coming out of each o/p. R20 ensures that at high frequencies that the o/p has better symmetry. The o/p stage when using only n-channel devices forms an asymmetrical push pull stage, in practise this doesn't cause any problem and o/p symmetry is excellent... The O/P Stage Biasing Circuit The biasing circuit consists of R2, R6, R26, R19, R21, R23, P1, Q11, Q12, IC1, ZD4, E5 and E6. Q11, R2, R6, R26 and ZD4 form a pre-voltage regulator, which drops the main supply rail voltage down to 9 volts. which then supplies the LM317T regulator. The adjust pi



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