Motion sensor DD-010 disassembled with the control board removed and an additional siren (100 dB sound level) type KPS-4510 connected. Motion sensors (DD) based on Fresnel lenses and pyroelectric detectors can be used not only for their intended purpose – to turn on lights or as an element of a security alarm installed indoors. Cars Read more…
A vehicle’s electrical system can be supplemented with a device whose schematic and wiring are within reach of even a beginner. This device is a controller whose value is clear: its status LEDs give constant, reliable information on the condition of the stop lamps, with minimal draw from the onboard supply. When the brake pedal Read more…
To avoid running extra wiring for auxiliary electrical appliances when using a portable lamp, it is enough to fit a homemade adapter into the lamp holder, as shown in the figure. To make the adapter, use a lighting socket in which three holes are drilled: one in the base—for the cleaned (glass and glue removed) Read more…
Portable electronic devices with low-voltage power supply are often designed for batteries and accumulators. Among such devices, the most popular are electromechanical and digital clocks, radio receivers, flashlights, and… wireless doorbells operating on a radio channel at a frequency of 303 MHz (there are variants at 933.25 MHz). Digital cameras with a connector for external Read more…
For remote monitoring of the serviceability of stop-light lamps in a car, transistor electronic («Modelist-Konstruktor» No. 6’2000) or relay-transistor devices are usually used. The latter is part of the standard electrical equipment of some cars as relay 4402.3747 and represents a design of magnetically controlled HERmetically sealed CONtacts — reed switches («Modelist-Konstruktor» No. 7’91, 4’98, Read more…
The importance of proper operation of a car’s electrical equipment is, of course, indisputable. This thematic selection prepared by our author tells how to increase its reliability. HOW TO MEASURE THE DWELL ANGLE? The dwell angle (contact closed angle) of a VAZ-2105 car can be determined by the amount of movement of the camshaft timing Read more…
I’ve been familiar with the “Modelist-Konstruktor” magazine for more than a year now. Mainly as an avid reader and somewhat less as a DIY enthusiast, trying to implement in practice some of the promoted ideas and original technical solutions in the conditions of a simple home workshop. Now I’m offering one of my own developments. Read more…
A mini-electro-calorifier (MEC) type heater is unlikely to surprise anyone these days. These compact and quite convenient household appliances can be purchased to suit any taste. However, it’s not at all necessary to spend money on industrial products, let alone imported ones. I, for example, have long been using a homemade MEC that, by unanimous Read more…
While equipping my bathroom as a sauna (see “Modelist-Konstruktor” No. 10, 1997), I decided to make a powerful (3 — 3.5 kW) and reliable heater myself. The most acceptable option seemed to me to be an electric heater in a tin bucket with an asbestos-cement terminal block and brass studs, covered with a hinged metal Read more…
They say you can’t save much on matches, and yet… A simple and practical electronic “match,” the description of which we offer to readers’ attention, will free you from the need to constantly monitor that matchboxes don’t remain empty. The “match” works as follows. The electrical energy accumulated by capacitor C1 (see the schematic diagram) Read more…
