Elektor Team (9534)

1-07-1983 | I~ low colt CMOS lock A decimal keyboard, a CMOS IC, three transistors and an opto-coup- Ier ... that is about all that is needed to make th...

1-07-1983 | elektorjuly/august 1983 glitch suppressor in position 2), glitches will not be detected. A signal at the input of Nl is inverted and applied...

1-07-1983 | 69 R. de Boer UBLI Iyu >Bá UL UH —Ui window comparator This window comparator uses only three CMOS inverters, two resistors, two preset...

1-07-1983 | 70 sea murmur simulator 2V The heart of the circuit is the "mur- mur source" consisting of Ti and R 10. This produces a signal which is o am...

1-07-1983 | 71 W. Schaaij RS 232 P86 o„ VIA 1 T1,T2= BC547B RS 232 printer interface and a few minor changes to the Printer Monitor software. As can b...

1-07-1983 | elektorjuly/august 1983 72 simple stabiliser This is a very simple but nonethe- less reliable stabiliser circuit which can be used in place...

1-07-1983 | 73 electronic switch for audio signals The complexity of the problems as- sociated with switching audio signals is proportional to the sophi...

1-07-1983 | 74 vector control for the Junior ENA d 2 E RAM 0 LE ROM 0 Nigel Humphreys Computer 1LS30 iet - ivo = wc - ,4LS00 N6 ... N8 = IC3 = 74LS86 Th...

1-07-1983 | 75 four quadrant multiplier This four quadrant multiplier can be built using just one op-amp and the amplification factor can be preset with...

1-07-1983 | 76 microprocessor aid Faultfinding in microprocessor sys- tems is an arduous and time- consuming task. It would be a great help if it were p...