Open555

Ever wondered how a 555 timer IC worked? Here you have it! A 555 IC, made entirely with THT transistors.

Schematic

PCB

Feeatures

• Low power design! 3V operating voltage
• On board square wave generator
• Selectable features through solder brides
• A Schematic on the back side!
• Super cute cats on the front side - Kudos to @acornitum

BOM

• 1 Battery holder
• 1 10uF Capacitor
• 11 PNP Transistor
• 11 NPN Transistor
• 1 100k Resistor
• 1 10k Resistor
• 10 4.7k Resistor
• 3 220 Resistor
• 2 Potentiometer
• 1 Push Button

Design your own PCB at http://solder.hackclub.com/!