Creating parts queries.

Using agentic mode for queries.

Ensuring component linking.

Preparing component queries.

Using Knowledge Base Tool.

Searching for components.

Dispatching Library tool to find: "Find a 5 V active buzzer (self-driven, no external PWM required) for microcontroller projects. Through-hole (radial) package preferred, but SMD acceptable if needed. Rated for 5 V DC operation, continuous tone, typical current <= 30 mA. Suitable to be switched on/off via low-side NPN transistor from a 3.3 V ESP8266 GPIO."

Dispatching Library tool to find: "Find a small-signal NPN BJT suitable for low-side switching of a 5 V active buzzer from a 3.3 V ESP8266 GPIO. Requirements: Vceo >= 30 V, Ic >= 100 mA, available in TO-92 (through-hole) or SOT-23 (SMD). Common parts like 2N3904/PN2222A or equivalents acceptable. Prefer widely available parts."

Creating search plan for: "Find a 5 V active buzzer (self-driven, no external PWM required) for microcontroller projects. Through-hole (radial) package preferred, but SMD acceptable if needed. Rated for 5 V DC operation, continuous tone, typical current <= 30 mA. Suitable to be switched on/off via low-side NPN transistor from a 3.3 V ESP8266 GPIO. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 20"

Creating search plan for: "Find a small-signal NPN BJT suitable for low-side switching of a 5 V active buzzer from a 3.3 V ESP8266 GPIO. Requirements: Vceo >= 30 V, Ic >= 100 mA, available in TO-92 (through-hole) or SOT-23 (SMD). Common parts like 2N3904/PN2222A or equivalents acceptable. Prefer widely available parts. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 20"

Searching: "Small-signal NPN transistor, Vceo >= 30 V, Ic >= 100 mA, low-side switch for 5 V buzzer driven by 3.3 V GPIO, TO-92 or SOT-23 package preferred"

Searching: "General purpose NPN BJT 30 V 100 mA SOT-23 TO-92 through-hole or SMD"

Found 79 results.

Searching: "Find a small-signal NPN BJT suitable for low-side switching of a 5 V active buzzer from a 3.3 V ESP8266 GPIO. Requirements: Vceo >= 30 V, Ic >= 100 mA, available in TO-92 (through-hole) or SOT-23 (SMD). Common parts like 2N3904/PN2222A or equivalents acceptable. Prefer widely available parts. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 20"

Searching: "5 V self-driven active buzzer, continuous tone, through-hole radial preferred, typical current <= 30 mA, switchable by low-side NPN from 3.3 V MCU"

Searching: "5 V active buzzer self-driven continuous tone, typical current <= 30 mA, switchable by low-side transistor (include SMD and through-hole)"

Found 31 results.

Searching: "Find a 5 V active buzzer (self-driven, no external PWM required) for microcontroller projects. Through-hole (radial) package preferred, but SMD acceptable if needed. Rated for 5 V DC operation, continuous tone, typical current <= 30 mA. Suitable to be switched on/off via low-side NPN transistor from a 3.3 V ESP8266 GPIO. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 20"

Finished searching for components.

Focusing on user request.