Elektor Team (9517)

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...

1-07-1989 | P 1 R9 12V R4 039 ENERGY CONTROL FOR BATTERY CHARGERS R3 85 11 01C2 D2 D3IRef 1C1 rr= P2 T2 50k R6 R2 00 50k BC517 T1 2 ROR7 1% 9. 10* BC517...

1-07-1989 | 040 TEST & MEASUREMENT The Type LTC1042 lc from Linear Technology is a window comparator that can function with very small currents. This is...

1-07-1989 | 041 CAR ELECTRONICS The car alarm accepts signals from a variety of sources, includ- ing special sensors and the standard switches in a car,...

1-07-1989 | 042 This inexpensive unit switches the light on at dusk and off again at dawn. The circuit has separate time bases for the on and off delays...

1-07-1989 | Common 789 456 123 N1...N4=IC1 = 4070 N5...N8 = IC2 = 4070 KO 9 K8 8 :75 21 D 44 1C2 0 0 r m02 D3 D4 .114 "14 Rs111 R70 98 ei R9 12V BC557 B...

1-07-1989 | DI di, 1 D2 • clk 2 D3 air 2 D9 • relay 1:15 • XI • 0000 0 0 BC 547 044 X Y PLOTTER INTERFACE N1.-N4 =ICI = 7400 N5...N8= IC2 = 7086...

1-07-1989 | *see text R1 045 TIMER WITH AUDIBLE WARNING RESET VI EMI ZIT) id 1 2 P1 * R2 5008 CAI9 220n 9V R3 c2 O Applications of this little circuit i...