8253 1 is used to generate proper usable clock signal and to trigger uP after 1 hr. 8253 2 is used to run alarm for 30 sec. CTR0 and CTR1 of 8253-1 IC are setup in mode3 and CTR2 in mode 2 CTR0 of ...

If you are an electronics hobbyist then you must have heard about the 555 timer IC and its 3 popular circuits viz. astable multivibrator, bistable multivibrator, and monostable multivibrator. Apart ...

When it comes to designing timer circuits, the very first thing which comes to mind is the 555 timer IC. It’s the oldest piece of tech and thus you can rely on it blindly and best of all, it’s ...

This circuit generates a tone that sounds very similar to a siren. The generator part of the circuit is made of the combination of PNP and NPN transistors. Toghether, the two transistors build up a ...

Join us for Elektor Lab Talk on August 18, 2022, at 18:00 CEST on YouTube. Mathias Claussen (Senior Engineer, Elektor) and Jens Nickel (Editor in Chief, Elektor) will talk about Elektor Summer ...

Zetex Semiconductors have a siren driver IC Type ZSD100 available that is suitable for use in alarm systems for cars and model craft. With the addition of only a few components as shown in the diagram ...