[sdiy] ebay resistors recommendations for values and quantity

[Jack Kevorkian]

On 2/17/08, Jack Kevorkian <etherogue at gmail.com> wrote:
> could anyone suggest a good book on the subject of operational
> amplifiers?  I need to know why my oscillator circuit attempts
> continue to fail.  Do I need to use resistors with tighter tolerences?
>  Are "lead lengths" an issue with op-amp circuits?  Should I abandon
> the 741 altogether, and use TL081s?  I wonder if I should just stick
> with circuits that employ positive/negative voltages?  I suspect that
> I need literature beyond a pin-out sheet.
>
> On 2/17/08, Dave Kendall <davekendall at ntlworld.com> wrote:
> > Hi James.
> >
> > You can never have too many 100K resistors  ;-)
> > When I planned bulk buys for mostly CGS and EFM stuff, I found that I
> > needed 10-20 times more 100K than any other value, about 5-10 times
> > more 10K, and a similar number of 1K.
> > Other common values were 47k, 4K7, 220R, 220K.
> > 15K crops up often in CGS designs. The resistor dividers in the output
> > buffers in CGS circuits vary a bit from circuit to circuit- I'd try
> > different ones, or work out what gate output level you want, then buy
> > lots of those pairs (eg 680R/820R, or 1K/2K2 etc.)
> >
> > FWIW, some other very common components were;
> >
> > 1N4148 or 1N914 signal diodes
> > 100K Linear pots
> > 100n decoupling capacitors
> > 10uF 25 - 35V electrolytic caps.
> > TL072/074 op amps
> > DPDT toggle switches.(nearly as cheap as SPDT, but more versatile)
> >
> > Perhaps worth ordering some of the above at the same time to save on
> > shipping, if you don't have lots already....?
> >
> > cheers,
> > Dave
> >
> >
> >
> >
> > On Feb 16, 2008, at 21:28, James R. Coplin wrote:
> >
> > > I am tired of buying resistors for my projects per project as I always
> > > seem
> > > to have piles of odd resistors but not necessarily the correct ones.
> > > There
> > > are some good deals (even with shipping) from Chinese suppliers
> > > offering 1%
> > > lots.
> > >
> > > It ends up beings $19 after shipping for 2500 resistors of the
> > > following
> > > values (50 resistors each value):
> > >
> > > 2.7 ohm
> > > 5.6ohm
> > > 9.1 ohm
> > > 16 ohm
> > > 24ohm
> > > 30 ohm
> > > 36 ohm
> > > 56ohm
> > > 75ohm
> > > 82ohm
> > > 100 ohm
> > > 150 ohm
> > > 180 ohm
> > > 220ohm
> > > 430 ohm
> > > 820ohm
> > > 1kohm
> > > 1.5 kohm
> > > 1.8 kohm
> > > 2.4kohm
> > > 3.3 kohm
> > > 3.6 kohm
> > > 3.9 kohm
> > > 5.1 kohm
> > > 10 kohm
> > > 12 kohm
> > > 16kohm
> > > 27kohm
> > > 36 kohm
> > > 43 kohm
> > > 47 kohm
> > > 62 kohm
> > > 91 kohm
> > > 100kohm
> > > 120 kohm
> > > 160 kohm
> > > 180 kohm
> > > 270 kohm
> > > 330 kohm
> > > 360 kohm
> > > 430 kohm
> > > 560 kohm
> > > 620 kohm
> > > 910kohm
> > > 1.3 Mohm
> > > 2.4 Mohm
> > > 3 Mohm
> > > 4.7 Mohm
> > > 8.2Mohm
> > > 12 Mohm
> > >
> > > My question is, is this a good selection of values or are these more
> > > odd
> > > ball values instead of useful values?  Are there values that there
> > > should be
> > > more of and what are they?  I'm not looking to make a life-time buy
> > > would I
> > > would like to purchase enough to keep me going for 1/2 a lifetime.  The
> > > sellers I'm considering are auspicious.e,	sureelectronics, and
> > > apmmall.engineering.  Has anyone had any dealings with these folks.
> > > Or, if
> > > these are sketchy, are there any others folks recommend.  Thanks!
> > >
> > > James R. Coplin
> > >
> > >
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