Metal detector circuit using 555

Introduction

A simple and short summary of metal detector circuits and the parts used in those.

Circuits

Speaker, battery and wires are not included in these lists.

https://www.electronics360.org/how-to-make-a-powerful-metal-detector-circuit-using-555-timer-ic/

• NE555
• 100mH/ 24AWG
• 10 muF, 2.2uF
• 47kohm

https://theorycircuit.com/ic-555-ic-741/simple-metal-detector-circuit-using-ic-555/

• NE555P
• 100 turns, 6 cm diameter
• 1uF, 0.01uF
• 100kohm

https://www.circuits-diy.com/simple-metal-detector-circuit/

• NE555
• 170 turns, 10 cm diameter
• 2.2uF x 2
• 47k

https://www.instructables.com/Make-a-Metal-Detector/

• 555
• 28 AWG wire, 220-250 turns, diameter 1 inch
• 2 x 1 uF, 3 x 10 uF
• 47 kOhm

https://www.hackster.io/mircemk/diy-simple-sensitive-ib-metal-detector-with-2xne555-ic-14a3bb

• NE555
• potentiometer 10kohm, 100 kohm
• npn

https://www.instructables.com/DIY-Pirate-Metal-Detector-Using-NE555-TL072/

• NE555
• diameter 20 cm, 25+ turns
• 100 nF, 10 myF, 1 nF, 1 myF, 1 mF
• 5k, 10k, 100k potentiometer plus 50, 100, 150, 220, 380, 10k, 47k, 68k, 70k, 120k, 2M (R11)
• TL072 opamp
• irf740
• c1815
• s8550
• 1n4148

https://www.instructables.com/Metal-Detector-Variable-Frequency-Using-555/