ChatDiagram
METAL DETECTOR

BFO Metal Detector with LM339, 7805, BF422

A worked metal detector example, rendered live. Open it in the AI editor and adapt it to your own case.

UPDATED 2026-09-12
TYPECircuit
USE-CASEBfo Metal Detector
EXAMPLEBFO Metal Detector with LM339, 7805, BF422
Make this diagram your own.

Open it in the AI editor with a prompt pre-filled — keep what works, change what doesn't.

CASE ANALYSIS

Scenario

A hobbyist needs a readable BFO metal detector schematic that clearly separates power, oscillator, mixer, comparator, and indicator stages.

Key decisions

  • Use two BF422 Colpitts-style oscillators (search and reference) to produce a beat note.
  • Use a 7805 regulator to derive a stable 5 V rail from a 12 V battery.
  • Use an LM339 comparator to square up the detected envelope.

When to reuse this

Reuse when building or documenting a classic BFO metal detector and you need a clean, auto-routed netlist rather than a positional wiring diagram.

← See more bfo metal detector examples
Open this example in the editor →

Tweak it with chat, export PNG/SVG, or fork it for your own use case.