Elektor Team (9534)

1.07.1986 | one-chip DC converter I 121 R =(Vour-1.2) Finally, the output current may, of course, be boosted by means of a medium power transistor in a...

1.07.1986 | EE July/August 1986 13rms-to-DC converter For some obscure reason, estab- lishing the root-mean-square (rms) value of an alternating voltage...

1.07.1986 | There are a number of well-founded arguments against the use of poison to get rid of mice, rats and other rodents in and around the home. Fr...

1.07.1986 | EE 40 July/August 1986 151thermostat-controlled soil heating Many people with a keen interest in growing plants insist on the fact that many...

1.07.1986 | This circuit provides motor-cycle riders with a gear indication to the foot-operated lever at one side of the engine block. The proposed ind...

1.07.1986 | industrial-clock controller 171 At the same time, bistable IC5 toggles and causes the bridge circuit composed of T2. . .T8 to reverse the mo...

1.07.1986 | Alan G Hobbs 18telephone-bell simulator This circuit is intended for use in a small private telephone installation. The ringing tone sequenc...

1.07.1986 | +12V p" 0 10n 12V 8OrnA max This timer automatically switches off equipment left operating unattended for more than about thirty minutes. Th...

1.07.1986 | EE 44 July/August 1986 AN OPTICAL-FIBRE NETWORK FOR OFFICES, FACTORIES AND HOSPITALS A very versatile experimental local telecommuni- cation...

1.07.1986 | EE July/August 1986 20four-tone siren This interesting little circuit is par- ticularly aimed at modellers. Based on just one IC, it is easy...