Category Archives: Misc



12 Stage Water Level Indicator

The is a simple and versatile 12 stage water level indicator circuit which will show you the current water level in the tank. This circuit can be used for general purposes. This circuit generates an alarm when the water level is below the lowest level of L1 and also when the water just touching the… Read More »

Electronic Quiz Button Table

This is the circuit diagram of electronic quiz button table. This circuit is simple, easy to built and of course it is not expensive. This quiz circuit used for four game participants. It determines the contestant who first presses the switch (S1 through S4) to answer a question and locks out the remaining three entries… Read More »

Diode Zener Tester

This is the circuit diagram of zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. This is a handy circuit and will help you to measure the zener diode easily. This diode zener tester can be fitted in a 9V battery box. 1/3 of the box may be used… Read More »

Digital Variable Resistor / Potensiometer DS1669

The DS1669 is an electronic digital rheostat manufactured by Dallas Semiconductor. This component has a function similar to digital variable resistor/potensiometer which can be operated by push the buttons. You can adjust the audio volume, LCD contrast, frequency, etc. by using two buttons instead of a common potentiometer/trimpot. This circuit explains how we do it… Read More »



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