Pin-Pointer Metal Detector â Oscilloscope Traces - Instructables
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Pin-Pointer Metal Detector â Oscilloscope Traces - Instructables
Blue Trace 2V per cm â Arduino TX Pulse (Trigger). 2. Yellow Trace 2V per cm â 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