CA3130 circuits
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Shadow Alarm
Feb 21st
This shadow alarm circuit can sense a moving shadow in a confined area. It can be used to protect things from theft. When somebody approaches the unit, it will give a loud alarm to abort the attempt of theft. The circuit uses the light sensing property of the Photo diode. (more…)
Temperature to Voltage Converter
Jan 31st
With this simple temperature to voltage converter circuit we can do a precise measurement of the temperature in a room. A NTC resistor or a thermistor is used as a sensor that has a strong temperature dependence. If the NTC temperature rises then the output voltage rises with 0.5 V per 10C. (more…)
Voltage to Frequency Converter Circuit
Jan 17th
This voltage to frequency converter circuit has an oscillator that is voltage controlled and has a small, 0.5% deviation. IC1 function as a multivibrator and produces rectangular impulses with equal width. The width of the impulses depend on R4, P1 and C1. With P1 we can do fine adjustments of the output frequency. (more…)
Sensitive potentiometer, commutator
Oct 31st
This sensitive commutator is based on IC1, one operational amplifier with a high input impedance. When the finger touches Se1 sensor, C2 is charged, this will cause the linear dropdown of the IC1 output voltage. When we touch Se2 sensor the opposite occur. This sensitive potentiometer circuit has different applications and can be user anywhere is needed a potentiometer wich can be controlled with variable voltage. If you need normal commutators or buttons place serial 1M resistor. (more…)
Touch volume control
Oct 21st
Touch controls are not only used to switch devices on or off. They can also be used to control different functions. One good example is the TV remote control. If it is very important to keep the activated functions for a long period of time, it is always better to use a digital memory system. However, if small drifts in the control status is acceptable, a simple analog design can be used to memorize the status. (more…)
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