The 555 Timer

Following Forrest Mims in laying out the 555 Timer IC as a block diagram allows one to focus on the functions of the circuit.

Very popular for its versatility, the 555 Timer IC can operate in either astable or monostable multivibrator mode, resulting in a variety of applications.

This IC contains 23 transistors, 2 diodes and 16 resistors.

Supply voltage: 4.5 to 15 Supply current: 3 to 6 mA @5V 10 to 15mA@15V Output current: 200mA max Power dissipation: 600mW 8-pin mini DIP 556 is 14 pin dual 555.

555 Astable Multivibrator

555 Monostable Multivibrator