Tsukure Mad Labs 1 Second Audible Clock

This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful in many applications in which some sort of time-delay counting in seconds is desirable. The circuit is formed by a CMos 4024 counter/divider chip and 3 diodes, arranged to divide the frequency of the input signal at pin #1 by 50 (or 60, see Notes).

The input impedance at pin #1 is very hight, so simply touching the pin (or a short track or piece of wire connected to it) is usually enough to provide the necessary input signal. Another way to provide an input signal consists in a piece of wire wrapped several times around any convenient mains cable or transformer. No other connection is necessary.
 

Let's Get Started!

Below you will find a list of bits to gather before hand, followed by a detailed schematic. Using a breadboard lay out the components and connect them together as shown. Alternatively you can purchase this module from our shop and simply solder the components in the places indicated on the quality assured printed circuit boards provided.


What You Need...


1 9V Black Battery Holder Clip Snap On Connector Cable Battery / Battery Holder
1 102 (1000pF / 1nF / 0.001uF) Capacitor (Ceramic)
1 104 (100nF / 0.1uF) Capacitor (Ceramic)
1 10uF Capacitor (Polarized)
4 1N4148 Diode
1 CD4024 7-Stage Ripple Counter Integrated Circuit (IC)
1 5mm Yellow (Diffused) LED
1 1 Watt / 8 Ohm Full Range (2.8 cm) Loudspeaker
1 100R
[ Brown, Black, Black, Black ]
Resistor (0.25 Watt)
1 10K
[ Brown, Black, Black, Red ]
Resistor (0.25 Watt)
1 47K
[ Yellow, Violet, Black, Red ]
Resistor (0.25 Watt)
1 On/Off Rocker Switch (3A/250V) - Small Rectangle Switch
2 BC337 Transistor (NPN)

NB: Any resistor colour codes specified relate to 5 band resistor codes, the 5th band has not been shown intentionally. The 5th band indicates the resistor tolerence, we use only the highest tolerence resistors in our products.


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