| It is widely believed that electromagnetic fields can affect biological systems, including man, although the evidence remains equivocal. Qu...
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| The development and widespread use of data communications over recent years means that methods of error detection and correction have bec...
| Virtually all modern cars have a built-in alarm to warn if you have left the lights on when you are getting out of the car. There are, how...
| The charger makes cunning use of the properties of a Type 555 timer. The tnternal window comparator of the lC is set to 4.7 V by zener dio...
| One advantage bipolar opamps have over FET types is that their input noise level is appreciably lower. However, when abipolar opamp is us...
| Control elements in electronics often use a small current to control a large one. In fact, this is such a common situation that there is...
| Nowadays, with the advent of SMD (surface mountdesign), it is possible to construct tiny circuits. In the case of crystal oscillators th...
| The stepper presented here makes use of nine positions of a 12-position rotary swtch. It is, of course, possible to add the omitted steps...
| The simplest solar-cell supply system consists of three parts: a diode, a solar-cell panel, and a rechargeable battery. The diode prevent...
| Although there are a number of ICs available that convert frequency to voltage, this can also be done with discrete components as shown...