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Driving Relay with 555 IC

2015-02-03 14:41  
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This is a Driving Relay circuit using 555 IC. The circuit is used to drive a relay to avoid 555 hangs up, it uses an inductive feedback. The coil is prevented to drive Pin 3 below a negative 0.6V by a clamp diode that across the coil. However, in some case, this negative voltage maybe cause the timer to malfunction. We can solve this problem by driving the relay through a dioda. So, pin 3 will never receives a negative voltage. Here is the circuit :

Driving Relay with 555IC circuit schematic diagram

[Source: Philips Semiconductors Application Note]

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