# Overheat Detector Alarm/Switch

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At the heart of this circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. The LM35 develops an output voltage of 10 mV/K change in measured temperature. Designed to… Read more »

# Frequency Generator Circuit

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This voltage to frequency converter circuit use the CA3130 OP-Amp ICs, that linearity Of changing is very well up to 0.5% and Temperature coefficient of less than 0.01% per degree Celsius. In Figure 1, IC1 act as the frequency generator is controlled by voltage. Suppose, first the output voltage of… Read more »

# Cheap frequency meter by CA3130

The electronics are still used to use a frequency generator circuit beuause It is important. And are used a lot in electronic circuits, both sine, square wave and more. In every time related to the frequency. What that we want to know is how much frequency. For laboratory common standards…. Read more »

# Simple vu meter schematic

Expensive stereo is general often have VU meter come to and for help show max power the stereo not too much. For radio tape general plaything has will no VU Meter. I then think to seek Multi meter use can replace. By use Range 100uA and electronics equipment the other… Read more »

# Motor burn out and under voltage protection

This is AC motor burn out protection causes of under voltage input. The principle is simple, it will check for voltage at all times. Normal voltage is 220V AC. If the voltage falls below a preset. Relay will not work and the LED is a warning. Can be set to… Read more »

# 300W inverter power 24Vdc to 220Vac by MJ15003,CA3130,CD4027

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This is circuit 300W Inverter power,so input battery 24V to Output 220Vac 50Hz 300W. I used main Component IC CD4027 , NE555,CA3130 and LM7805. The transistor power MJ15003,2N3773 driver transformer 24V 10A min. The VR1 – 100K is control Frequency output at 50Hz 50Hz or 60Hz at Square wave signal…. Read more »

Introduction With this mAh meter you can check the mAh capacitance of your NiCad or NiMH rechargeable batteries Normally the cheaper NiCad AA-type cells have a capacitance of 500-750mAh (NiCAD) the more expensive NiMH AA-cells types are up to 1800mAh. I built this circuit because the capacitance of some of… Read more »

# Light Change Detector by IC CA3130

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Circuit Light Change Detector by IC CA3130 This the Secretariat of the Swith light high-quality circuit. By prominent its point is when the light changes the system will order to give Relay work immediately. Detect the change in the light that get from the circuit is will that. We use… Read more »

# Infrared Intruder Alarm

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circuit Infrared Intruder Alarm This the circuit warns the trespasser infrared system or Infrared Intruder Alarm circuit that interesting. By when there is a person passes or cut the light infrared. The system will clearly warn immediately, command give relay work, build current give super siren or The other ,… Read more »