| There are many different types of code locks, ranging from numeric keypads through chip cards and magnetic-card readers. The one presented...
| There are many different types of code locks, ranging from numeric keypads through chip cards and magnetic-card readers. The one presented...
| To drive a stroboscope from an audio signal, the signal must first be reduced to its low-frequency component. This can be done with the...
| The diagram shows how a three-phase sine wave oscillator can be built with a single Type UAF42 state-variable filter and some resistors an...
| The combination of a couple of thyristors, key switches and a relay as shown in the diagram forms a suitable, reasonably tamper-proof code...
| The LM56 from National Semiconductor is an accurate, dual-output, low-power thermostat contained in an 8-pin SMD case. It contains a 1.25...
| With the equipment that is found in the domestic or office environment, the distinction between the various disciplines is becoming increa...
| The simplest version of a constant-current source, which we often use for that reason, consists of only a FET with the source and gate c...
| A linear circuit consisting of an input buffer, IC1a, and output-scaling amplifier, IC1b, two zener diodes, D1 and D2, and several other c...
| RADIO, TELEVISION VIDEO CW generator aid for radio amateurs The generator described can accept texts of up to 64 characters long and make th...
| BATTERY CHARGERS battery charger reliable, yet inexpensive Charging NiCd batter ies does not neces sarily require a com plex design. The cha...