The circuit shows one way of obtaining a voltage of 90 V from a 1.5 V battery supply. The LT1073 switching regulator from Linear Technology (www.linear-tech.com) operates in boost mode and c... Read more
The board may be used in as AVU shown in Fig. 1 or as in Fig. 2 ‘with a transformer rated from 1.5 VA to 12 VA. When used with a very small transformer, it is possible to cut off the part ma... Read more
The Type Y1112 fluoractorTM form Taxes instruments a specially designed thyristor for starting fluorescent tubes. Its main advantages over a standard thyristor are its much greater hold curr... Read more
Halogen lamps, particularly high wattage ones, tend to draw very high currents when they are cold because they then have a very low resistance: of the order of 0.1 Ω or lower. If such a high... Read more
Intelligent power switch: Taxes instruments’ TPIC2404 is a monolithic high-voltage, high-current, quadruple loads, such as relays, solenoids, motors, lamps, and other high-voltage, hig... Read more
General purpose time switch: This circuit meets the requirement for a simple, low-cost timer with a timing range of a less than a second to several tens of hours, and a thyristor-based mains... Read more
Most PCs are provided with a cooling fan to ensure that the internal temperature does not rise unduly. Unfortunately, in many PCs, the fan noise soon becomes an irritant. Since for a large p... Read more
Class A preamplifier: Nowadays, the design of preamplifiers is almost invariably based on integrated circuits. However, there are still many constructors de who scribed like a discrete desig... Read more
When an appliance ceases to —K operate, there may be various causes for this, one of which is the blowing of the mains fuse. The monitor proposed here contains an LED that lights when that i... Read more
Many model train enthusiastic UV find the mechanical reversing system for trains in the HO series from Marklin and other manufacturers primitive and unreliable. The system is based on a.c. m... Read more
