This is a lovely nostalgic kit that wouldnt look out of place in an ‘elektor’ from the 1980s. However, it is an ideal project to teach people how to solder and introduce them to digital electronics. The proper functioning of such a clock obviously hinges on the accuracy of the one-second clock pulse. We measured the pulse period with our frequency/period meter PM6669 from Fluke. Over a period of one day, the pulse duration varied between the two values below: - 0.999,762,6 second - 1.000,047,2 seconds The positive and negative deviations are probably caused by variations in room temperature. That, over one day, there is both positive and negative deviation from the exact value of 1,000,000.0 seconds is favourable. The lagging of the clock at 0.999,762,6 seconds is then partially offset by the leading at 1.000,047,2 seconds.

This is a lovely nostalgic kit that wouldn't look out of place in an ‘elektor’ from the 1980s. However, it is an ideal project to teach people how to solder and introduce them to digital electronics. The proper functioning of such a clock obviously hinges on the accuracy of the one-second clock pulse. We measured the pulse period with our frequency/period meter PM6669 from Fluke. Over a period of one day, the pulse duration varied between the two values below: - 0.999,762,6 second - 1.000,047,2 seconds The positive and negative deviations are probably caused by variations in room temperature. That, over one day, there is both positive and negative deviation from the exact value of 1,000,000.0 seconds is favourable. The lagging of the clock at 0.999,762,6 seconds is then partially offset by the leading at 1.000,047,2 seconds.

This is a lovely nostalgic kit that wouldnt look out of place in an ‘elektor’ from the 1980s. However, it is an ideal project to teach people how to solder and introduce them to digital electronics. The proper functioning of such a clock obviously hinges on the accuracy of the one-second clock pulse. We measured the pulse period with our frequency/period meter PM6669 from Fluke. Over a period of one day, the pulse duration varied between the two values below: - 0.999,762,6 second - 1.000,047,2 seconds The positive and negative deviations are probably caused by variations in room temperature. That, over one day, there is both positive and negative deviation from the exact value of 1,000,000.0 seconds is favourable. The lagging of the clock at 0.999,762,6 seconds is then partially offset by the leading at 1.000,047,2 seconds.

A classic LED digital clock circuit, implemented with straight logic - no microprocessor or multiplexing. Just like we made in the 1970s, when the availability of red LEDs and TTL logic made this possible for the first time. The lack of multiplexing keeps down the radio-frequency noise, and also makes this a great driver board for a much bigger display, e.g. using photocoupler relays to drive fluorescent tubes._Great value, high quality kit. Includes sockets for the ICs, which are probably best skipped for long-term reliability, unless you are scared of damaging the chips.

A classic LED digital clock circuit, implemented with straight logic - no microprocessor or multiplexing. Just like we made in the 1970's, when the availability of red LED's and TTL logic made this possible for the first time. The lack of multiplexing keeps down the radio-frequency noise, and also makes this a great driver board for a much bigger display, e.g. using photocoupler relays to drive fluorescent tubes. Great value, high quality kit. Includes sockets for the IC's, which are probably best skipped for long-term reliability, unless you are scared of damaging the chips.

A classic LED digital clock circuit, implemented with straight logic - no microprocessor or multiplexing. Just like we made in the 1970s, when the availability of red LEDs and TTL logic made this possible for the first time. The lack of multiplexing keeps down the radio-frequency noise, and also makes this a great driver board for a much bigger display, e.g. using photocoupler relays to drive fluorescent tubes._Great value, high quality kit. Includes sockets for the ICs, which are probably best skipped for long-term reliability, unless you are scared of damaging the chips.