| A part from use as a standard charger, the present unit may also be used for continuous trickle charging to keep a 12 V lead-acid battery...
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| Soldering is an unhealthy activity: when the tin melts it releases harmful vapours. lt is, therefore, advisable, to install a small 12 V...
| When a three-phase mo-tor is being installed, it is essential to know the sequence of phases R, Y and B, since an error may have disastro...
| Reversal of the supply lines to a circuit normally has disastrous consequences. The protection described here can prevent such a disaste...
| Electric points of a model railway system contain two small magnets. To set the potnts ina gtven position, one ofthese magnets must be e...
| 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...