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Bipolar timer

NE555 Basic Circuit

Build a basic NE555 circuit with labeled pins, component values and connection guidance.

Package view

NE555 in a circuit

A complete wiring example with numbered pins, component values and local ground symbols.

NE555P physical PDIP-8 circuit with numbered pins, 10 kiloohm and 68 kiloohm timing resistors, golden capacitor symbols and a red LED with a 1 kiloohm series resistor.
Physical package orientation and lead numbers are explicit. All matching supply labels and ground symbols refer to the same nets; readings are illustrative.

Connect it, step by step

Follow the component values and pin connections

Power and control

Connect pins 8 and 4 to +5 V, pin 1 to ground. Use a 100 nF supply bypass and a 10 nF capacitor from CONT to ground.

Build the timing network

RA = 10 kΩ, RB = 68 kΩ and C1 = 10 µF. Join pins 2 and 6 to the capacitor node; pin 7 connects to the resistor junction. The capacitor’s positive plate faces the timing node.

Read the cycle

Nominal high time is 0.693 × (RA + RB) × C1 = 0.541 s. Low time is 0.693 × RB × C1 = 0.471 s. The LED flashes about once per second; tolerance changes the exact result.

Component view