NE555 Monostable

This is a monostable mode circuit of NE555 IC timer. Feature : timing period is 1.1msec, precision, Simple circuitry, independent output duration, 12V supply. Component : Resistor, capacitor, NE555 timer IC. [zen22142.zen.co.uk]

Basic 555 Squarewave Oscillator

The following circuit is a Basic 555 squarewave oscillator. Feature : 1 Khz tone, Simple circuitry, limit = 200 mA, inductive voltage reduced, 4.5-9 Supply voltage. Component : 555 timer IC, resistor, capacitor, Speaker, 2N3053 transistor, push button. [qsl.net]