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MULTI-SWITCH DOORBELL WITH INDICATORS

T.K. Hareendran, Electronic Design Freelancer, AspenCore

Here’s the circuit of a multi-switch input musical doorbell (shown in Fig.1). The circuit is built around the popular and less expensive quad D-latch...

Traffic Baton

EFY Bureau

In small towns, there are no traffic lights and the police regulate the traffic with hand signals. Since their hand signals may not be...

Traffic Controller

EFY Bureau

This simple traffic controller can be used to teach children rudiments of traffic rules. The circuit (shown in Fig. 1) uses readily available components. It...

Build an Automatic Fan Speed Controller with 555

Suresh Dwivedi

During summer nights, the temperature is initially quite high. As time passes, the temperature starts dropping. Also, after a person falls asleep, the metabolic...

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