DATASHEET and Circuit Diagram

The following LM555 Datasheet consist of informations about a highly stable device for generating accurate time delays or oscillation. As stated in the datasheet, this LM555 is direct replacement for SE555/NE555 since the LM555 has an additional terminals for desireable triggering or resetting.

The illustration beside shows the top view of LM555 Connection Diagram which has 8 pinouts (ground, trigger, output, reset, +Vcc, discharge, threshold, control voltage). In the depth read of the datasheet, you will find explanations about LM555 monostable operation, multivibrator running mode, frequency divider, some waveform examples of pulse width modulator (PWM), pulse position modulator, linear ramp, and 50% duty cycle oscillator.

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After previously article discuss about 555 IC, the following article will provide you with an application kit – a two LED flasher which uses 555 IC Timer to be wired as a Square Wave Oscillator (astable operation mode). This application kit has a double ended output connection in which the LEDs will start to flash simultaneously ON and OFF when connected to a battery or 5V to 15V power supply.

The circuit diagram shown above perform how to assembly of the two LED flasher application kit. And these are the following component to be applied: 2 pcs 820R grey red brown for R3 R4, 2 pcs 1K brown black red for R1 R2, 1 pc Koa trimpot 100K 104, 1 pc ceramic capacitor 10n 103 (C1), 1 pc electrolytic capacitor 10uF (C2), 2 pcs 5mm re LED for L1 L2, an LM/NE555 IC, a 8 pin IC socket, and a 3138 PCB.

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Below we will provide you with useful article information to produce your own specific oscillator or pulse generator from integrated circuits (ICs), resistors, and capacitors using no matter the version of 555 IC.

What you will find in this article are sections such principle of the 555’s operation when wires as an oscillator, experience the basic modes of 555’s operation (monostable and astable), and circuit diagrams of 555 timer as monostable, when wired to demonstrate control voltage function, audio oscillator (figure beside), or adjusting the duty cycle of the 555 timer IC.

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