circuity

so do i need to remove all the 6.8k and 20k resistors or only the 20k resistors? for the BASE of BC547 what resistor value should i use then?....or do i need to find another type of transistor...?... how about BC107? ??? thanx

i couldnt find the book with the info i needed..... the one with the info has not been returned to the library... and i need this circuit as soon as possible... that's y i asked here... sorry guys.... i really need ur help....

do i need to remove all the 6.8k and 20k resistors or only the 20k resistors? what resistor value should i use then?....or do i need to find another type of transistor...?... how about BC107?

does this mean that the resistors that i added are correct? can i use BC547 and connect the base BC547 to the output of the circuit with 5.6k resistor in series?

is this circuit ok? im also thinking about adding a relay at the output (where the lamp is).. relay with rating should i use...? wht else should i do to make this circuit work...? sorry... im not tht good in logic circuits... ??? thanx

is this circuit ok?

do u guys mean like this? so i need a 1k resistor..... ok thank u very much u guys...

thanx audioguru for the fast reply. but i dont understand what you are trying to say.... does it mean that i need to add other components.. what should i add...? i dont have any clues.. im a newbie in electronics.... ??? thanx....

hi, I have simulated this circuit in Multisim and it works... but when i build it did work.. I have several question about this circuit. 1) do i need to add any other component for the real circuit (hardware) 2) i already put together the circuit using SN74LS21N (AND gate), SN745LS04N (NOT gate), SN745LS32N (OR gate) .. but there is no output. 3) the output (pin 8 and 6) is high when only the Vcc and Gnd of the SN74LS21N is connected... the same happens with the OR ic. 4) do i need a different supply for the Vcc? or can i use the same 5V supply for the input and Vcc... Thanx

I really need a program 2 simulate this circuit...... :-\ can anyone help?

hi, i am goin to make a report for this circuit and i need a simulation result attached.. but i cant find some of the components in my simulators.. please suggest the best simulator program.. p.s. i changed the TL081 with MC34071P thanx

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

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