ELECTRONICS
Simple BFO Metal Detector Using Two 555 Timers and LM386
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CASE ANALYSIS
Scenario
A hobbyist needs a readable BFO metal detector schematic that shows the two 555 oscillator stages, passive mixer/detector, and LM386 audio output with a clear ground return.
Key decisions
- Dedicated SEARCH_OUT and REF_OUT nets keep the two 555 oscillator blocks separated before mixing.
- A diode detector followed by R3/C6 low-pass filter extracts the beat note.
- Rload represents an 8 ohm speaker so the audio output is a valid two-pin load.
When to reuse this
Use this netlist when drawing BFO-style detector circuits where functional IC blocks and clear net names matter more than internal 555 pin-level detail.
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