Posts Tagged ‘LM556 Timer’

RS – Flip-Flop Made With A LM556 Timer

The circuit on this page is for a hybrid – SET / RESET type of logic Flip-Flop that is constructed from an LM556 – Dual Timer integrated circuit.
The design is crude but effective for very low speed applications. Its greatest asset is that the outputs of the LM556 are capable of driving current loads of up to 200 milliamps with a minimal voltage loss.
This circuit was originally developed to drive “Stall Motor” type switch machines that are used on model railroads. These motors use low voltage DC and pass approximately 15 milliamps when they are in a stalled condition.
Due to the design of the LM556 timer chip there are multiple output options available in this design. These include the normal timer outputs which are bipolar and the ‘DISCHARGE’ terminals, (PINS 1 and 13), that are open collector circuits.

Read More Source: http://home.cogeco.ca/~rpaisley4/LM555.html#12

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D – Flip-Flop Made With A LM556 Timer

This circuit is a hybrid – D type Flip-Flop that is constructed from an LM556 – Dual Timer integrated circuit. The circuit is essentially a High-Tech and overly expensive version of the classic transistor flip-flop.
Each time the push button switch (S1) is closed the outputs of the timers will reverse so that one is HIGH and the other is LOW and vice versa. As with the D flip-flop the circuit acts as a binary divider.
D – Flip-Flop
The circuit has some output switching time lag due to the RC time constants at the inputs and the different Trigger and Threshold voltage levels of the timers themselves.
This circuit is not very useful but would make a good Push On / Push Off switch circuit and has a reasonably high sink or source output current level.
Source: http://home.cogeco.ca/~rpaisley4/LM555.html#19

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555 Timer – Frequency and Time Interval Calculator

555 Timer – Frequency and Time Interval Calculator – Calculates positive and negative time intervals for the 555 timer based on R and C values. Also contains descriptions and operation of each input and output of the timer and schematics for the two basic modes of operation (monostable or “one-shot” and astable or “rectangular wave oscillator”). Also contains a pictorial diagram of the timer connected as a LED flasher and a table of connections for the 556 timer (dual 555 timer).

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