Title

1.

99.99-Second Stop-Clock:
This circuit helps to measure accurately the flow-rate of liquid, or the motion of a mechanical part. It can also be used by sports enthusiasts to time a race.

2.

A Bidirectional Visitors Counter:
This counter can be used to know the number of visitors present in a room at any given time. It is useful for places such as movie halls, buildings and offices. To keep the cost low, it uses a simple calculator instead of a counterand-display circuit. The calculator can be used as a normal calculator any time by plugging it off from the circuit. All the components are readily available in the market and the circuit is easy to build.

3.

A Digital Clock Using Ordinary Components:
This digital display clock is a major attraction in offices, industries etc., which is less susceptible to shock, requires hardly any maintenance, operation is independent of position of placement with stable timings.

4.

A Ladder Crystal Filter Receiver for the Beginner:
This circuit has a filter utilising the ladder network technique, thus acting as a good communication receiver to isolate a particular signal from the numerous radio stations.

5.

A Simple Directional Detector/Counter:
A simple circuit that counts the number of persons entering the premises ignoring those exiting or leaving it

6.

A Single-Chip Timer with Digital Clock and Calendar:
This circuit depends entirely on the chip on which other functions rest, viz. A multi-function digital clock that gives you real time display of time/day/week etc. with a versatile programmable timer.

7.

A Snooze Switch for Mechanical Alarm Clocks:
This circuit is a solution for you to get up at the right time in the morning and lets you sleep for a few minutes more in case you don't care about it and will ring again after a predetermined period.