Elektor Team (9512)

1-07-1986 | Light-emitting diodes are perfectly suitable for dark-room light, because they (a) obviate the need of filters; (b) emit cold light; (c) hav...

1-07-1986 | EE 86 July/August 1986 1631Mandelbrotgraphics The computer-based implementation of certain iterative types of calcul- ation may offer highly...

1-07-1986 | The purpose of this one-chip circuit is to give an audible alarm in case a thief attempts to steal the car radio, which is generally conside...

1-07-1986 | 88 65 deceptive lock This circuit offers a means to fool all EE July/August 1986 but the cleverest burglar, but, although it is a clever des...

1-07-1986 | from an idea by A Buhlmeier 66 noise gate and two regulator sections are re- quired. For a double mono version, two control sections and two...

1-07-1986 | Here is a circuit that enables you to leave a boring meeting at any time you like. When you have had quite enough of the exasperating, seem-...

1-07-1986 | EE July/August 1986 68 Despite the many laudable qualities of the BBC microcomputer as to speed and ease of peripheral inter- facing, many u...

1-07-1986 | 69halogen lamp protector Halogen lamps are, unfortunately, rather prone to burn out when they are switched on, and this is mainly owing to t...

1-07-1986 | simple NiCd charger 1701 Dry batteries have one major disad- vantage: they go flat. Rechargeable types, such as NiCd cells, also suffer from...

1-07-1986 | by P Sicherman two-tone chime EE 92 July/August 1986 171 This electronic chime is easily built from commonly available, inexpen- sive parts....