circuity Posted February 23, 2006 Report Share Posted February 23, 2006 Hi,this is my circuit. I have several questions:a) i dont have any output at the VOUT (2) of LM35DT. Why?b) how can i replace the LED display with 7-segment display. What do i need to add?c) transformer with what current rating should i use?d) what brigde rectifier should i use?. Please tell the model number.Thanx Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 23, 2006 Report Share Posted February 23, 2006 a) i dont have any output at the VOUT (2) of LM35DT. Why?It needs an amplifier to boost its output of only 10mV/degree C.b) how can i replace the LED display with 7-segment display. What do i need to add?Program the microcontroller for it.c) transformer with what current rating should i use?The circuit's current is very low. Calculate or measure it.The LM317 regulator is missing a resistor, therefore its output voltage is only 1.25V.d) what brigde rectifier should i use?. Please tell the model number.The circuit's current is very low. Calculate or measure it. Quote Link to comment Share on other sites More sharing options...
circuity Posted February 24, 2006 Author Report Share Posted February 24, 2006 can i use a uA741 to amplify the output of LM35DT..?what microcontroller should i use...?im a newbie in electronic circuits...... ???thanx audioguru for ur fast reply Quote Link to comment Share on other sites More sharing options...
Tony_Stoynov Posted February 24, 2006 Report Share Posted February 24, 2006 Hi,Yes you can, but must think about input offset voltage, you must make the input compensation. I can suggest to use more precision OPAMP, something like MCP606/7/8/9 from Microchip or OP-41, OP-07 etc. Quote Link to comment Share on other sites More sharing options...
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