Linear Amplifier Design for Ham Radio

flux

0:00

Work completed
  • Project description updated with LPF bank and fan control details.
  • Mermaid system architecture diagram added under the “System Architecture” property.
  • Major ICs placed:

    Table

    ComponentDesignatorPurpose
    K2K2Signal relay for LPF selection
    U11U11Relay coil driver
    U12U12Fan driver IC
  • Other active components reviewed (no discrete transistor needed with dedicated fan driver).
Remaining tasks 5. Fetch ULN2003A quiescent supply current and set project property. 6. Fetch FAN3122CMX-F085 VCC current and set project property. 7. Add supporting passives: decoupling caps, flyback diodes, resistors. 8. Place 2-pin fan header. 9. Wire nets:
  • LPF_CTRL → relay driver inputs/coils + flyback diodes.
  • PROT_CTRL → fan driver input + flyback diode.
  • Fan header power & control.
  1. Run ERC and label nets/components.
Success criteria status
  • LPF pi filters not yet implemented → segmentation and 50 Ω matching pending.
  • Fan header and overtemp control circuitry not yet placed or net-tied.
  • ERC not run; no errors checked.
Next step Pick and add the 5th-order Chebyshev pi filter components for each sub-band, then connect the relay coils and driver inputs to the LPF_CTRL net.
133 days
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  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
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  • Generic Resistor
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6m-40m Linear Amplifier thumbnail
100 W, 7–55 MHz Broadband Class‑AB RF Power Amplifier for Yaesu FT‑818 with 50 Ω I/O, 13.8 V/15 A Supply, Relay T/R Switching, PTT/ALC Interface, Selectable 5th‑Order Chebyshev LPF Bank, and Overtemperature‑Controlled Fan Support

Properties

mm
mm
dB
dB

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