Chef_Tom Merch › 555 Drop In Timer 555 Drop In Timer from $6.00 A small PCB which allows you to place a variable 555 timer into the socket for a full can oscillator. A small PCB which allows you to place a variable 555 timer into the socket for a full can oscillator. Kit Style: Select Kit Style Blank PCB PCB With Components Fully Assembled Quantity: Add To Cart Added! AssemblyYouTube