Elektor Team (9510)

1-07-1988 | I oI This oscillator supplies an output level between -10 dBm and +3 dBm, and can be tuned between 1250 MHz and 1800 MHz simply by varying t...

1-07-1988 | This circuit enables a computer to con- trol the power supplied to a mains oper- ated device (lamp, heater, drill, etc.) in 255 steps. Varia...

1-07-1988 | FIVE-BAND STEREO GRAPHIC EQUALIZER This design of a stereo equalizer is fairly unusual because it is based on induc- tive feedback. In theor...

1-07-1988 | EE JULY/AUGUST 1988 Here is a simple "who"s the first" circuit that can be used in quiz games with up to eight participants or groups of par...

1-07-1988 | It is never advisable to leave a car"s headlights on for long periods when the engine is not running. Yet, especially during the winter mont...

1-07-1988 | This simple multivibrator circuit is remarkable for its high efficiency and ability to drive relatively heavy loads. The circuit supplies a...

1-07-1988 | This low-cost circuit enables turning room lights on and off simply by touching a round metal sensor. The light is turned on by briefly touc...

1-07-1988 | 03 PRINTER SHARING BOX This simple circuit makes it possible to connect two computers to a single printer. Toggle switch Sz selects the rel-...

1-07-1988 | OMA-2500 is a 1 kW time standard trans- mitter on 2500 kHz. The station is located in Liblice, Czechoslovakia, and is operated by the Astron...

1-07-1988 | PROGRAMMABLE SWITCHING SEQUENCE The proposed control circuit is shown in the diagram as containing two relays, but this number may be increa...