Elektor Team (9519)

1-07-1988 | I ¬?I 1 I LOW-FREQUENCY LC OSCILLATOR It is not always appreciated that LC cir- cuits may be used for generating low frequencies. The propos...

1-07-1988 | 0 SINGLE-CHIP 150 W AF POWER AMPLIFIER The Type LM12 operational amplifier from National Semiconductor has at least one remarkable character...

1-07-1988 | EE JULY/AUGUST 1988 02 AUXILIARY NEGATIVE- VOLTAGE SOURCE Manycircuitsrequire,apartfrom the connectedgatesN2toNsincl.,functions usualpositiv...

1-07-1988 | 0 Light-duty (25 to 600 W ) solid-state relays 1 have recently been introduced on the marketby Sharp.These smalland com- pact devices switch...

1-07-1988 | This timer can be set to count a maxi- mum of 60 hours. It also allows an inter- val to be set. When this interval is reached, a buzzer soun...

1-07-1988 | EE JULY/AUGUST 1988 02 FLASHING LIGHT This is a rather unusual application of IC1 the Type 317 voltage regulator. With only a handful of ext...

1-07-1988 | A calibration generator is used for quickly checking receiver operation. The design shown here generates RF signals (markers) at 1 MHz inter...

1-07-1988 | This circuit shows that a preamplifier for magneto-dynamic cartridges can be relatively simple without seriously com- promising compliance t...

1-07-1988 | 0 1ALTERNATING CURRENT SOURCE One of the less known properties of field effect transistors is that some of these are electrically symmetrica...

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...