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LM555 Timer IC Introduction

LM555 is a highly stable integrated chip, which is usually used for flashing LED, generating different frequency waveforms and driving buzzer.

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ULN2003 Relay Driver IC

Today, I will introduce you to ULN2003. It is basically a relay driver IC and a Darlington array with high voltage and high current. It consists of seven open collector Darlington pairs with common emitters, indicating that ULN2003 has the ability to process seven different relays at a time.

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