For my own quirky reasons, I wanted to make an honest condenser mic like they did in the 1930s (just not as good, I'm sure). My basic idea is to use a sheet of aluminum foil or aluminized mylar hanging about 1mm* from the large pad on the PCB. Foil is fine because I know it's conductive, but I can imagine the problems I'd run into trying to stretch it to the frame as it's fragile. The...

6023 polyester film is a biaxially oriented film made by melting, casting and stretching. The film adopts environmentally friendly flame retardant, which has excellent flame retardant performance and low toxicity when burning. 6023 has been certified by UL laboratory and has a flame retardancy of 94VTM-2. It has obtained the SGS certificate in compliance with the RoHS directive.6023 has good...

BOPET film, or biaxially oriented polyethylene terephthalate (BOPET) film, was developed by the British ICI company in the 1950s. After decades of development, the products have developed from the initial single insulating film to the current capacitor film, packaging film, photosensitive insulating film, etc.; according to the thickness, there are dozens of specifications from 0.5 to 250...