Basic alarm indicator

The most obvious alarm indication is a flashing light.This requires relatively complex electronics. however, to achieve correct flash-ing. Moreover, in certain circumstances, such as when the lamp is in bright light. -Lie indicator cannot be seen properly. The present circuit is simplicity itself: it consists of only three components and provides not only a visual[…]

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CMOS dimmer

Siemens’ Type SLB0586A IC enables the simple construction of a dimmer with touch control. Used in conjunction with a Type TIC206D triac, it allows the dimming of light bulbs of 10-400 without any problem. A 100 pH, 5 A inductor is needed to suppress the switching noise. Synchronizing pulses are derived from the mains voltage[…]

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Bounce-free switch

Switch with change-over con-200 tacts traditional debouncing circuits are not always usable or economical. Keyboard switches, for instance, seldom have change-over contacts. Furthermore, change-over switches have one extra connection, which can not always be accommodated in the construction. The small circuit here operates with one make contact or one break contact. Which one does not matter[…]

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Decibel stepper

Decibel stepper, The stepper presented here makes use of nine positions of a 12-position rotary switch. It is, of course, possible to add the three steps. As usual, the amplification factors are arrived at by connecting a number of resistors in series in the feedback circuit. The resistors used here are for the E-96 series,[…]

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