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45 WATT AMPLIFIER CLASS B

45 WATT AMPLIFIER CLASS B

Power transistors Q8 and Q9 Can be Used satisfactorily: 2N3055/MJ2955, TIP3055/TIP2955, TIP35/TIP36, MJ802/MJ4502 amongst others.
Power transistors Q8 and Q9 Should be mounted on a black, finned heatsinks as usual.

Technical data:

Output power (1KHz sinewave): 45 Watt RMS into 8 Ohms - 69W RMS into 4 Ohms
Sensitivity: 0.81V RMS input for 45W output
Frequency response @ 1W RMS: 15Hz to 23KHz -0.2dB
Total harmonic distortion @ 1KHz: 1W 0.008% 20W 0.008% 45W 0.016%
Total harmonic distortion @10KHz: 1W 0.01% 20W 0.015% 45W 0.025%
Unconditionally stable on capacitive loads

List Component

  • R1: 18K
  • R2: 3K9
  • R3,R6: 1K
  • R4: 2K2
  • R5: 15K
  • R7: 22K
  • R8: 330R
  • R9,R10: 10R
  • R11,R12: 47R
  • R13: 10R/1 Watt
  • C1: 1µF/63V
  • C2: 470pF/63V
  • C3: 47µF/25V
  • C4: 15pF/63V
  • C6: 220nF/100V
  • C6: 100nF/63V
  • D1,D2,D3,D4: 1N4148
  • Q1,Q2: BC560C
  • Q3,Q4: BC556
  • Q5: BC546
  • Q6: BD139
  • Q7: BD140
  • Q8: 2N3055
  • Q9: MJ2955

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