| The direct conversion or synchrodyne receiver was invented several decades ago, but only with the advent of modern semiconductor technology...
More about technology (448)
| The term GSM stood originally for Graupe Special Mobile. The meaning Global System for Mobile communications has been adopted recently as...
| Pulse width modulation (PWM) is Ideal for controlling small electric PCB drills that draw currents of up to 2 A. Larger currents are poss...
| The circuit presented here ensures that bicycle lights remain on for a little while after the bicycle (and thus the dynamo) has corne to...
| Integrated circuits ISDI012, ISDI016, and ISD I020 from chip maker ISD enable sounds to be recorded and played back. The final two digits...
| Undesired listening-in to telephone conversations may be prevented by the present circuit, which requires only two components to protect...
| The transmitter is intended primarilyy for use with the receiver in the preceding article. lt works from two small 1.5 V dry batteries or...
| To keep the converter simple, it contains no preset controls, which means that the level of the output voltage is dependent to some degree...
| The indicator shows eight wind directions by means of LEDs. The sensors are reed contacts powered by a permanent magnet. The mechanical co...
| The monttor is intended for use in relatively small spaces (like living rooms). The sensor is a readily available LM335 from National Semi...