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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