Page 1 of 6

QRP-02 - The first SMD Gainclone amplifier in the world(?)

Click on the picture to get a larger view.

The world's first DIY SMD Gainclone

Specifications for the new advanced Gainclone.

  1. 50 um pcb with groundplane
  2. Fast recovery rectifier diodes, TO247 and option for TO220
  3. High performance 4700 uF/50V max, 10 mm snap-in and regular ones too.
  4. LM3886, inverting, 1k+18k, properly decoupled
  5. Mute
  6. Output filter, 14 turns, diam 8 mm, 1.5 mm wire, 5 mohms, 0.7 uH (I can get those inductors free of charge)
  7. Zobel network
  8. DC-servo, AD8620, properly decoupled (possible not to use it)
  9. Input buffer, non-inverting, 220 kohms input impedance, AD8620, properly decoupled.
  10. LM317/337 in SOT223
  11. All elctrolytic caps hole mounted
  12. SMD caps PPS, X7R, NPO types, 0805, 1206, 2220 size
  13. SMD resistors, 0805
  14. Lug connectors with option for 2.5 mm2 wires
  15. Fuses 5 x 20 mm