BZV55C12 12V Zener Diode 500mW 5% Tolerance SOD80 Package (Pack of 2500) DIP-8 Modern electret microphones use PTFE

Modern electret microphones use PTFE plastic

It's a box Type general-purpose Relay 24V DC 30A

the TP4056 is compatible with USB and wall adapters

7V lithium battery

The 100k Vertical PCB Preset Variable Resistor Trimmer Potentiometer is a three-terminal variable resistor that is used to vary or change the resistance

BZV55C12 12V Zener Diode 500mW 5% Tolerance SOD80 Package (Pack of 2500) DIP-8 Modern electret microphones use PTFEThis is the BZV55C12 Zener diode. A Zener Diode is a semiconductor device that is used to conduct current either in the forward or reverse direction. The diode consists of a special, heavily doped p n junction, designed to conduct in the reverse direction when a certain specified voltage (Zener voltage) is reached. Every Zener diode has a well defined reverse breakdown voltage after which it starts conducting current in reverse bias mode without