Archive for the ‘Control Electronics’ Category
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 …
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 …
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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 …
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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 …
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DC drive for a Universal motor is shown in figure below. In order to supply DC current to the motor, a diode bridge has been added around the motor. The motor current freewheels through the diode bridge after the TRIAC current crosses zero.
To limit the rate of fall of the current as defined in the …
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The figure below shows the schematic of a Digital Thermostat. The output of LM35 is digitized by the A/D. The LM35 is a temperature transducer IC with an output of 10 mV per ‘C. This 10 mV corresponds to 1/2 LSB and the circuit resolution is 2 ‘C if the Vref/2 is set …
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