200W AUDIO AMPLIFIER WHEN 2SA1943 AND 2SC5200 ARE USED.


200W AUDIO AMPLIFIER 

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Amplifier operating voltage max. 2X50V DC 6A (2X33VAC or 2X36VAC transformers can be used) supply filter capacitors For usable bridge diodes between 4700uf… 10.000uf, ready KBU10M or 4 P600J 6 ampere diodes can be used.

330PF capacitor protects the amplifier from high frequency oscillations. If you cannot find a 330PF, you can use a 270PF capacitor instead.

To understand that the transistors are original, it is necessary to measure BETA or hFE with a digital multimeter. The 2SA1015 should show 180 or slightly less in the hFE measurement. 2N5401 can be used instead of 2SA1015, but the leg connections are different, be careful with this, the basin and collector legs should be changed in the PCB assembly.

2SC5200 and 2SA1943 transistors need to use insulators in the cooler assembly. You can look at the article Heat conduction and insulators for details, the equalization resistors of output transistors 0.33-OHM….

The Cooler can be used for TIP41-TIP42 transistors, small cooler for all of them or you can look at the heat condition.

The 5uH coil must be wide enough to pass into a 10-OHM 1W resistor to be wound 11 rounds of 1mm wire.

When 2SC5200 and 2SA1943 are used for the writer output transistors (2SD1047 (NPN) 2SB817 (PNP)), the max. He says that it can be 2X62V DC, in this case the voltage of the capacitors used must be above 63V and instead of TIP41 TIP42 2SCC2073 (NPN) 2SA940 (PNP) or 2SA1837 (PNP) 2SC4793 (NPN) should be used. I think 2X50V is enough, even if you say I don’t want loud sound, it could be 2X30V

Amplifier Component List

Transistors
  • 2SC5200
  • 2SA1943
  • A1015
  • TIP41C
  • TIP42C

Resistors
  • 6.8-OHM resistor – 1W (blue, gray, gold)
  • 100-OHM- 1W (brown, black, brown)
  • 10-OHM – 1W (brown, black, black)
  • 270-OHM 1W (red, purple, brown)
  • 56-OHM 1W (Green, blue, black)
  • 27-OHM 1W (red, purple, black)
  • 0.47-OHM 5W or 0.33-OHM 5W stone resistor
  • 820-OHM 1 / 4W (gray, red, brown)
  • 10K – 1 / 4W resistor (brown, black, orange)
  • 330-OHM 1 / 4W (orange, orange, brown)
  • 18K – 1 / 4W (brown, gray, orange)
  • 1K – 1 / 4W (brown, black, red)

Capacitors
  • 100NF (104) 100v
  • 47uF 63v
  • 2.2uF 63V
  • 330pF (331) (ceramic or multilayer)

Diodes
  • 1N4004


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