aniruddha

Aww... come on guys please help me :'( Atleast with the first three??

Please tell me whats a "STEPPER MOTOR" ? Does it also have part numbers or variants? Whats the approximate cost? Thanks in advance.

Hi everyone, I have a few conceptual probs. pls hlp. 1- What is the constructional difference between polar and non-polar capacitors? 2- What is the operational(functional) difference between polar and non-polar capacitors? 3- If a polar capacitor is connected with opposite polarities will it act like a diode? 4- Also are there any different theory/formulae/laws governing polar capacitors or they are same as those for non-polar capacitors? 5- Also pls give details on polystrene (excuse the spelling mistake) and electrolytic capacitors.

hmm.. well i didn't suggest a LM3915 because... I didn't know about it ... he he he

If the size of ckt is quite large then the effect of stray capacitances and inductances could be reduced by 1- Twisting the connecting wires. 2- Connecting a very small (about 1pF) capacitance in parallel close to the IC pin.

Hmmm.... do you mean something similar to those different colour LEDs that glow depending on frequency outputs and the number of LEDs of a particular colour glow depending on amplitude of output of that frequency? Well say you've got an option of 5 colours ... R/O/Y/G/B. You could use band pass ckts with different BW depending on frequency zones. eg. 300hz-700hz, 700hz-1.3khz, 1.3khz-2.1khz, 2.1khz-2.9khz, 2.9khz-3.4khz Now the no. of LEDs connected down the ckt. after the BP filters will glow depending on the amplitude of filter output. You could use an ADC say ICL-7109 or just a ladder of comparators (of course this is bulky & costly but simpler to build) LM 339 would be perfect with inverting inputs receiving reference vtg levels from a resistor ladder (acting as vtg. divider). All the non-inverting inputs be connected to the filter output. Further the comparator outputs are connected to different LEDs of same colour.

you said:="I need an automatic pot. If I could somehow start with lots of resistance that decreases after power is given then I would be set ! " What about using an inductor? You could also connect a tiny resistance in series. ;) Just trying to give a suggestion. ;D

From the last post it appears that u just want a DAC ckt using passive components like resistors... if thats right i could suggest the foll. 3 methods: 1-Binary weighted resistor D/A Converter 2-R/2R Ladder D/A Convertor 3-Inverted R/2R Ladder Convertor ...the above ckts. do require an amplifier as the methods need a current to voltage converter at output. ;D

hi ashray, i m a newbie too and actually this is my first post so excuse me if theres any mistake ;D I read a book on D/A--A/D convertors ... but in the book 0808/0809 monolithic CMOS devices were mentioned as Analog to Digital convertors so is that what u meant?