30 LED Projects by Colin Mitchell

By Colin Mitchell

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They used a crystal earpiece. We have substituted it with a piezo diaphragm and used a quad opamp to produce two building blocks. The first is a high-gain amplifier to take the few millivolts output of the piezo and amplify it sufficiently to drive the input of a counter chip. This requires a waveform of at least 6v for a 9v supply and we need a gain of about 600. The other building block is simply a buffer that takes the highamplitude waveform and delivers the negative excursions to a reservoir capacitor (100u electrolytic).

The game consists of six LEDs and an indicator LED that flashes at a rate of about 2 cycles per second. A push button is the "Operations Control" and by carefully pushing the button in synchronisation with the flashing LED, the row of LEDs will gradually light up. But the slightest mistake will immediately extinguish one, two or three LEDs. The aim of the game is to illuminate the 6 LEDs with the least number of pushes. We have sold thousands of these kits. It's a great challenge. THE DOMINO EFFECT Here's a project with an interesting name.

The aim of the game is to illuminate the 6 LEDs with the least number of pushes. We have sold thousands of these kits. It's a great challenge. THE DOMINO EFFECT Here's a project with an interesting name. The original design was bought over 40yearsa ago, before the introduction of the electret microphone. They used a crystal earpiece. We have substituted it with a piezo diaphragm and used a quad opamp to produce two building blocks. The first is a high-gain amplifier to take the few millivolts output of the piezo and amplify it sufficiently to drive the input of a counter chip.

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