Hobby Electronics Basics

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Starting capacitor on AC motors

Hi, got a question about those starting caps on AC motors in pumps, washing machines etc.. Why are they so freaking big...
2 comments posted 20yrs
posted by frogfot
2 comments posted 20yrs posted by frogfot

some questions relating television

i just to know .please tell me about the questions below Q: In TV signal transmission amplitude modulation is used for...
22 comments posted 20yrs
posted by nithinmulley
22 comments posted 20yrs posted by nithinmulley

Drain wire use

Hi, can anyone explain the purpose of the drain wire when there is already a foil shield on the outside of the wire? Is...
2 comments posted 20yrs
posted by g18c
2 comments posted 20yrs posted by g18c

inert gas

What kind of inert gas is typically in a lightbulb? What happens if you let it out and operate the lightbulb without it?
80 comments posted 20yrs
posted by bob
80 comments posted 20yrs posted by bob

Op Amp design

i need help designing the following Design an op amp with the following specifications: Avdm > 10000 with 1k ohm load C...
0 comments posted 20yrs
posted by TalalAntar
0 comments posted 20yrs posted by TalalAntar

PIC18F programming

Well, after copious amounts of searching, I came up with this site for a PICkit 2 adapter to program PIC18F's: http://p...
0 comments posted 20yrs
posted by randy.day
0 comments posted 20yrs posted by randy.day

atypical MOSFET drive question

I'm needing to switch up to a few 100mA to a device, must switch the source rather than the sink, and only have n-chann...
6 comments posted 20yrs
posted by nick
6 comments posted 20yrs posted by nick

RTD help

I have to measure ambient temperature changes (actual temperature is not needed, offset and long term drift don't matte...
11 comments posted 20yrs
posted by none
11 comments posted 20yrs posted by none

(URGENT!!!) Driver IC for IR

I need to know a driver IC for an IR receiver circuit. There are four switches at the transmitter end. I want to use a...
3 comments posted 20yrs
posted by amd.zfr
3 comments posted 20yrs posted by amd.zfr

Driving string of RGB LEDs over distance

Hi, I need to drive 40 x RGB LEDs spaced at 25cm intervals over a distance of 10mts. Initial thoughts are to make a sma...
0 comments posted 20yrs
posted by fromnews
0 comments posted 20yrs posted by fromnews

Lights problem

I am trying to design a warning sign with several bulbs which a section of the bulbs turn on while the other section ju...
3 comments posted 20yrs
posted by en1
3 comments posted 20yrs posted by en1

Need op amp comparator advise

I'm looking for a good comparator to work as a gate drive for a power MOSFET. I used an LMV321 in my simulations, but I...
4 comments posted 20yrs
posted by acataldo
4 comments posted 20yrs posted by acataldo

pls explain this circuit in detail

pls help me , i wasn't able to understand this circuit pls explain by the way its a modified sine inverter circuit . ht...
19 comments posted 20yrs
posted by elrefaie
19 comments posted 20yrs posted by elrefaie

resistor output

I hav a twelve volt battery, I connect it to a 10 Ohm resistor. Obviously I need a high wattage resistor. So i get 12/1...
15 comments posted 20yrs
posted by lera
15 comments posted 20yrs posted by lera

Voltage Follower

According to the books, the voltage-follower below should have an output of about 1.25V, but instead the output is 3.97...
11 comments posted 20yrs
posted by nobody
11 comments posted 20yrs posted by nobody