# qrp 40 meter transceiver (Component) ## Description Welcome to your new project. Imagine what you can build here. ## Component Details - **Owner:** knottedrush - **Created:** 2/12/2026 - **Last Updated:** 2/12/2026 - **Visibility:** Public - **Project Type:** 40 m CW transceiver - **Band:** 40 m (7.0-7.1 MHz) - **System Architecture:** flowchart TD ANT["Antenna 50 ohm"] --> TRSW["T/R Switch"] subgraph TX["TX Chain"] KEY["Key input + shaping"] --> OSC["RF Oscillator"] OSC --> BUF["LO Buffer"] BUF --> MIXTX["NE602 Mixer/Driver"] MIXTX --> PA["2N2222 PA"] PA --> LPF["7 MHz Low Pass Filter"] end subgraph RX["RX Chain"] TRSW --> RFIN["RF input"] OSC --> MIXRX["NE602 Mixer"] RFIN --> MIXRX MIXRX --> AFLPF["Audio LPF"] AFLPF --> AFA["AF amplifier"] AFA --> HP["Headphones/speaker"] end TRSW --> LPF LPF --> BNC["BNC Antenna Connector"] subgraph PWR["Power"] VIN["12 V DC input"] --> REG5["5 V Regulator"] REG5 --> VCC5["5 V rail"] end subgraph CTRL["Control"] KEY --> TRCTL["T/R control"] TRCTL --> TRSW KEY --> SID["Sidetone oscillator"] SID --> AFA end - **RF Output Power Target:** 1 W - **Modulation:** CW - **Aux Rail:** 5 V - **Input Supply:** 12 V DC - **Architecture:** TX oscillator + buffer/PA + 7 MHz LPF; direct-conversion RX with audio chain; T/R switching; sidetone; on-board regulation + decoupling - **Stars:** 1 - **Package / Case Code:** TO --- *Generated from [https://www.flux.ai/knottedrush/qrp-40-meter-transceiver](https://www.flux.ai/knottedrush/qrp-40-meter-transceiver)*