CIRCUIT · BFO METAL DETECTOR
BFO Metal Detector Circuit Diagrams
Explore BFO (beat frequency oscillator) metal detector circuit diagrams—from simple two-oscillator designs to high-sensitivity builds with op-amps and audio amplifiers. These examples show how the search coil, reference oscillator, mixer, and audio stages connect to detect metal objects.
Make your own bfo metal detector diagram.
Describe it in plain English — the AI drafts it, you edit. No template wrangling.
ABOUT
About these examples.
Whether you're a hobbyist, electronics student, or builder, these schematics give you a working reference. Use the generator below to start from a template or build your own BFO metal detector circuit diagram from scratch.
HOW TO
Make one yourself.
Choose a BFO detector template
Start with a pre-built BFO metal detector circuit diagram or open a blank canvas.
Add oscillator and mixer stages
Drag components for the search coil oscillator, reference oscillator, and mixer onto the canvas.
Wire the signal path
Connect the oscillator outputs to the mixer, then route the difference signal through a low-pass filter and audio amplifier.
Set component values and labels
Adjust resistor, capacitor, and coil values, and label test points for troubleshooting.
Export or share
Download the circuit diagram as an image or PDF, or share a live link.
FAQ
Frequently asked questions
What is a BFO metal detector circuit?
A BFO metal detector uses two radio-frequency oscillators—a search coil oscillator and a fixed reference oscillator. When metal changes the search coil's inductance, the beat frequency between the two oscillators shifts, producing an audible tone change.
Can I build a BFO metal detector from these diagrams?
Yes. The examples show complete component-level schematics. You can copy a design or modify one in the generator to match your parts and coil specifications.
What components are commonly used in BFO metal detectors?
Typical designs include transistors or op-amps for the oscillators, a mixer stage, a low-pass filter, and an audio amplifier. Common ICs include 555 timers, LM386 audio amplifiers, and dual op-amps like LM358 or LM339.
How do I make my own BFO metal detector circuit diagram?
Use the generator on this page. Pick a template, add or replace components, wire the stages, and adjust values—all in your browser.
Are these circuit diagrams editable?
Yes. Every example in the gallery can be opened in the editor, modified, and saved as your own.
MORE CIRCUIT COLLECTIONS
4-Digit 7-Segment Display Circuit Diagrams
Adjustable DC Power Supply Circuit Examples
Aircraft Wiring Diagram Examples & Templates
Alarm System Circuit Diagrams
Amplifier Circuit Diagrams
Apple EIS Circuit Diagrams: Examples & Generator
Arduino Circuit Diagrams
Astable Multivibrator Circuit Diagrams
AT89S52 Relay Board Circuit Diagrams & Design Examples
Audio Clipper Circuit Diagrams
5-Band Audio Equalizer Circuit Diagrams
Automotive Circuit Diagram Examples & Maker
Battery Charger Circuit Diagrams
Battery Overcharge Protection Circuit Diagrams
Battery Series-Parallel Circuit Wiring Diagrams
Beauty Salon Cleaner Circuit Diagram Examples
Blind Contact Detector Circuit Diagrams & Examples
Second-Order Butterworth Low-Pass Filter Circuit Diagram Examples
CMOS Logic Gate Circuit Diagrams
Contactor Interlock Control Circuit Diagrams
DC-DC Converter Circuit Diagram Examples
DC Shunt Generator Circuit Diagrams
PT2258 Digital Volume Control Circuit Diagrams
Dual Door Linkage Circuit Diagram Examples
Electric Wheelchair Controller Circuit Diagrams
Electronics Design Circuit Diagram Examples
ESP32 Battery Management Circuit Examples & Generator
ESP32 Embedded System Circuit Diagrams
ESP32 IoT Weather Station PCB Circuit Diagrams
ESP32 Load Monitoring Circuit Examples & Generator
ESP8266 Home Automation Relay Circuit Diagrams
Galvanic PWM Isolation Circuit Diagrams: Examples & Generator
GNSS Module Circuit Diagrams
Guitar Wiring Diagram Examples
Hand Crank Dynamo Circuit Diagrams
Highway Speed Checker Circuit Diagrams
Hobbs Enable Circuit Diagrams
Hydraulic Circuit Diagrams for Heavy Machinery and Industrial Systems
Inverter Circuit Diagrams
K-Line Transceiver Circuit Diagrams
Latching Power Switch Circuit Examples
LED Constant Current Protection Circuit Examples
Lighting Circuit Diagrams
Low-Noise Binaural Microphone Preamp Circuits
Monostable Multivibrator Circuit Diagram Examples
Motor Control Circuit Diagrams
Computer Mouse Circuit Diagrams
Multiplexed LED Matrix Circuit Diagrams
Non-Contact AC Voltage Detector Circuit Diagrams
NTC Heating Thermostat Circuit Examples
Parallel Resistor Circuit Diagram Examples & Maker
Photodetector Circuit Diagrams
Piezo Preamp Circuit Diagrams — Examples & Generator
Piezoelectric Energy Harvesting Circuit Diagrams & Examples
PLC Industrial Control Circuit Diagrams
Power Supply Circuit Diagrams
Pressure-Sensitive LED Mat Circuit Diagrams & Examples
0–300 Hz Pulse Generator Circuits for Electromagnets
Pump Control Circuit Diagrams & Examples
Railgun Circuit Diagrams: Examples and Free Generator
Raspberry Pi GPIO LED Driver Circuit Diagrams
RC Car Circuit Diagrams
Rechargeable Table Fan Circuit Diagrams & Examples
Relay Interface PNP NPN Circuit Diagrams
Latching Relay Circuit Diagrams
Residential Wiring Diagram Examples
Satellite Dish Signal Detector Circuit Diagrams
Series LCR Circuit Diagram Examples
Smart Agriculture Circuit Diagrams
Solar Panel Circuit Diagrams
Solar Tracking System Circuit Diagram Examples
Solar Wind Battery Lighting with Zapper Circuit Diagrams
Spirit Pi Metal Detector Circuit Diagrams
Circuit Diagrams for Stereo Audio Splitters with Transformer Isolation
STM32 RS-232 to Ethernet Circuit Diagrams
Styrofoam Cutter Power Supply Circuit Diagrams
TEC Temperature Control Circuit Diagrams
Three-Phase DOL Motor Starter Circuit Diagram Examples
Three-Phase Star-Delta Connection Circuit Diagrams
Timer Switch Circuits: Examples & Design Templates
TTP223 Touch Switch Circuit Diagrams
Vacuum Tube Amplifier Circuit Diagrams
Water Level Controller Circuit Diagram Examples & Templates
Wind Turbine DC Charging Circuit Diagrams
Full-Bridge WPT Sender Circuit Diagrams
Start from a blank canvas →
Open the AI editor and describe what you need — export PNG/SVG when you're done.