Elektor Team (9536)

1-07-1986 | The converter proposed here (also called voltage-controlled current source) is based on just one opamp, and provides to, or draws from, grou...

1-07-1986 | EE July/August 1986 36 by R Shankar 1 111 tuneable FM booster 01 BB106 C1 II Op 75 n BF961 BF981 This FM band (88-108 MHz) preampli- fier ha...

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...