Pin-Pointer Metal Detector – Oscilloscope Traces - Instructables

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Blue Trace 2V per cm – Arduino TX Pulse (Trigger). 2. Yellow Trace 2V per cm – RX transistor input on Base. RX Circu
Pin-Pointer Metal Detector – Oscilloscope Traces By TechKiwi Jan 2018

RX Circuit Input: 1. Blue Trace 2V per cm – Arduino TX Pulse (Trigger) 2. Yellow Trace 2V per cm – RX transistor input on Base

RX Circuit Output: 1. Blue Trace 2V per cm – Arduino TX Pulse (Trigger) 2. Yellow Trace 2V per cm – RX transistor output on RX Collector

TX Circuit: 1. Blue Trace 2V per cm – Arduino TX Pulse (Trigger) 2. Yellow Trace 5V per cm – TX transistor output on Collector

+Vin

Channel 1 Tx1

+5v

20 Turns Copper wire

10K 1M

5

0.047uf

D8

2.2K

LM339a 4

1N4148

1K 2

D9

12 BC548

Rx1 47R

Note: 1. Two Traces used with Zero Baseline as below 2. Unless shown scale is 2V per cm

3

20 Turns Copper wire

BC548

Schmitt Trigger effect to clean up pulse: 1. Blue Trace 2V per cm – LM399 Output to Arduino (Trigger) 2. Yellow Trace 2V per cm – RX transistor output on RX Collector