Elektor Team (9534)

1-07-1989 | 20 029 The resolution of moving-coil meters is general- ly no better than 1%, because the scale normally is given no more than 100 marker li...

1-07-1989 | 030 AUDIO & HI-FI SOUND LEVEL ATTENUATOR When the radio or record player is on at a fairly high volume, it is often impossible to hear the t...

1-07-1989 | 031 COMPONENTS FAST UNITY GAIN OPAMP A number of operational amplifiers can be used only in circuits that have a certain mini- mum amplifica...

1-07-1989 | 22 032 COMPUTERS When during a computer print-out something goes wrong with the printer, such as the paper getting snarled up, the only way...

1-07-1989 | 033 VARIABLE LOW-PASS FILTER The Type SSM2045 lc from Pmi is an active low- pass filter whose order, Q-factor, cut-off frequency and amplifi...

1-07-1989 | 034 GENERAL INTEREST AUTOMATIC SWITCH Many battery-operated instruments, such as digital voltmeters, have a change-over on-off switch. The a...

1-07-1989 | 30V 1>5pA D1 le 3mm red Cl Tant. T 2p 16 O *see text ELEKTOR ELECTRONICS JULY 1989 SUPPLEMENT LOW DISSIPATION REGULATOR With the advent of t...

1-07-1989 | 24 036 TELECOMMUNICATIONS DUPLEX AUDIO LINK Duplex communication is, of course, not a new technique: it has been used, for instance, in tele...

1-07-1989 | 037 HEAD / TAIL LIGHTS FOR MODEL RAILWAY a DI D5 (•o The price of a model railway locomotive is directly proportion- al to its facilities...

1-07-1989 | 038 1/0-FRIENDLY KEYBOARD COMPUTERS Not all computers have a keyboard, yet it is often essential to have the use of one. Two circuits are pr...