The LDM is a large-diaphragm, side-address condenser microphone. The creator offers instructions, schematics, and a bill of materials on his website.

Notable Features:

• Cardiod pickup pattern
• Based on the classic Schoeps microphone circuit

Price: $9.50 for instructions and bill of materials

Adjusted Cost: $99 (cost goes down as more mics are built)

HomeMadeMicrophones.com estimates $40 for the electronics, $42 for the tubing to make the body, and $17 for the grill mesh. There will be tubing and mesh left, however, over for more microphones.

More information at www.homemademicrophones.com.