Quantity   Component name
2 × 9V PP3 Battery Clip
1 × 9V PP3 Battery
1 × LM7812 Voltage Regulator 12 Volt Regulator
1 × 0.22uF Capacitor Electrolytic
1 × 0.1uF Capacitor Electrolytic
1 × LM358 Dual Op Amp Low-power dual operational amplifier.
1 × Arduino Nano
6 × 1K OHM 0.25W Resistor
2 × 100nF Capacitor Ceramic
1 × 4.7 uF Capacitor Electrolytic
1 × 500 OHM Trimmer Potentiometer To Calibrate 4-20mA Signal
1 × 10K OHM Potentiometer To Set Signal Level
2 × 15 Way Female PCB Header Pins To attach Arduino Nano
1 × 8 PIN IC Socket For 8-Pin Op Amp
1 × 4-Way PCB Screw Terminals For Output Signals
1 × 3-Way PCB Screw Terminals For Input from 10K Potentiometer
1 × 8 x 12cm Prototyping Board
1 × 26 AWG Hook-Up Wire I used Red, Black, Yellow & Green
1 × Solder
1 × Blue LED with 220 OHM resistor soldered to it For Power on indicator
1 × On / Off Switch To turn the instrument on and off!
4 × Crocodile Clips on wire for Instrument Test Connection
1 × Siemens Logo PLC For Testing
1 × ABS Instrument Case, 134 x 129 x 38mm I used this - https://uk.rs-online.com/web/p/instrument-cases/0220989