| Voltage doublers are frequently encountered in electronic circuits. The present one is a variation that is of interest since most digital...
More about Electronics (817)
| The circuit detects a change in video information and uses this to switch on an alarm in a closed-circuit television guard system of a vi...
| It is often not possible to put a second bell in parallel to the existing one, because the bell transformer is normally already fully loa...
| The lamp in slide projectors is normally controlled with the aid of a triac in series with it. This method reduces the brightness of the...
| Nickel-metal-hybride (NiMH) batteries have now become widely available. A typical one is the 120AAH, which has a capacity of 1.2 Ah in si...
| The ML2035 and ML2036 are monolithic sine wave generators that are programmable from d.c. to 25 kHz and from d.c. to 50 kHz respectively....
| Many battery-operated appliances have an LED indicator that shows the state of the battery. If the battery is almost flat, the LED flickers....
| A simple unit for testing an audio, TTL or CMOS circuit is always useful. Here, an oscillator, based on IC(1a), generates a frequency tha...
| The UAA2016 from Motorola lends itself admirably to making a proportional mains-operated temperature control. A resistor with negative tem...
| After the demise of BSB (British satellite Broadcasting) in early 1991, the electronics surplus market was flooded with tens of thousands...