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| Posted: 22 May 2013 01:10 AM PDT  A smoke detector is part of a sophisticated alarm system. Which within the system is a professional, most will include Section detector gas, room filling ions. Or sensitive to radio signals. However, this circuit does not have to be so complicated. Just another 2 LDRs and LED detection. Only the number of IC LM1801, the circuit helps the device is much less. Designed for this purpose. It consists, in Section controlled by the Zener voltage. Second output reference voltage output, the compare unit. And Transistor output resistance current 500 mA with diode clamp. This circuit does not require a transformer. Can be connected directly to the home. So there are diode – D1 rectifier as ACV, R2 serves to reduce the voltage at IC1 properly. Capacitor C2 filters the power was smooth. By a Zener diode in the circuit to control the voltage constant. The principle of this circuit Is [...] |
| Fuse status indicators for 12 volts power supply Posted: 21 May 2013 09:47 AM PDT  This circuit is a Fuse status indicators for power supply 12V. If a fuse is normally, the LED is going to lights all the time. But when it lacks, the LED will be blinking. The value of this equipment in the circuit is suitable for a 12 volt power supply. However able to change the power supply 6 volt or 24 volt, By reducing the value of the resistor to half or increasing. The display section consists of a stable multivibrators (Q1-BC547, Q2-BC547). And the driver LED section (Q3), All circuits except for the R5 connect before the fuse. The output of the multivibrators is going to work all times there are power supply, by passed through the diode D2 to the input of the driver LED section (Q3's PinB) If the fuse is intact , the base current of Q3 has still always, by passed through R5 and D1,the [...] |
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