Nokia Headset for 2.5mm Plug

                        Headset

Nokia Headset for 2.5mm plug

Requirements:

• Speaker 30Ohms (e.g. from old walkman headset)
• Microphone (e.g. from old mobile phone or cassete recorder)
• Button (optional)
• Capacitor 10nF
• Plug 2,5mm
• Wires