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PA amplifier with full security

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Vermes

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  • The measured power of the tip: 2x350W with 8 ohms resistance
  • Transformers: 1.5kW with 2x60VAC
  • Main filtration: 12x6800uF on 100V
  • Tips: 5 pairs of irfp240/9240
  • Cooling: tunneling on each channel
  • Wires to fund the tips: 6mm shielded.

The device has active lowpass filters built on TL072 on each channel and subsonic 37Hz-3dB, also built on TL072.
Protection:
  • short-circuit protection
  • overload protection
  • DC on output protection realized on 2 transistors and optotriacs
  • silent start made on time relays
  • soft start
  • thermal protection with smooth rpm adjustment build on two sensors, one bimetallic isolating the outputs above 95 degrees, and one thermistor to adjust rpm's
The housing was made from 2mm cut and a bend plate.
The amplifier weights 25kg.



Link to original thread – Wzmacniacz estradowy z pełnymi zabezpieczeniami
 

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