Fastest Quiz Bell/Alarm

This is aquiz bell/alarm circuit. This circuit indicate “fastest finger first”. This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees approx mid-rail voltage. The Quiz Master bulb is also illuminated.  Here is the circuit: There is no other bulbs can […]

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Automated Water Tank Filler

We can use the circuit below to maintain the level of water in the header tank within prescribed limits. A 3HP submersible bore pump which has a high starting current is controlled by this circuit, necessitating a solid-state relay sufficient to take the starting load. The upper and lower water sensors in the tank are connected with two Darlington transistors, […]

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Temperature Sensor Current Loop Transmitter

LM134 makes a good temperature sensor because it has a highly linear output characteristic. Because it is a current output device and is therefore not affected by long wire runs, LM134 is particularly useful in remote sensing applications. LM134 is easy to calibrate. It has good long term stability and can be interfaced directly with most data acquisition system, so […]

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Capacitive Discharge Ignition (CDI)

Mopeds or lawn movers ignition system design is based exclusively on CDI (1) in the world of small motor. CDI was in the past only used in the replacement module market in auto mobile. Today, the CDI system is becoming one of the most efficient choice available due to new standards of pollution control. The same application circuit using both […]

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