Elektor Team (9512)

1-07-1981 | P. De Bra low-noise microphone pre-amplifier -amp recording the roar of a lion. No single pre can guarantee a linear amplification of that k...

1-07-1981 | 58 extended range milli-voltmeter A multimeter, as the name implies, is a multi- purpose measuring tool, although it has its limits. For exa...

1-07-1981 |

1-07-1981 | temperature alarm This design allows a simultaneous check of a maxi- mum of four temperatures. The individual detectors are connected to the...

1-07-1981 | voltage regulators in parallel The well known 78xx series of voltage regulators are designed to produce currents up to 1 amp. In many instan...

1-07-1981 | 62 EPROM light sequencer 12 V The circuit described here is an eight channel light sequencer. The information for each channel (on or off) i...

1-07-1981 | 63 fast TTL interface It is surprising how often TTL ICs are asked to perform a difficult (if not impossible) task. It is, of course, gratif...

1-07-1981 | 64 stereo level controls In a normal pre-amplifier, potentiometers are used for volume, balance and tone controls, but, because they carry s...

1-07-1981 | 7-62 — elektor july/august 1981 optical indication for the movement detector This circuit is intended as an extension to the movement dete...

1-07-1981 | ously. When a key is depressed, the output of IC2 remains logic zero until the counter reaches the corresponding address for that particular...