[sdiy] ebay resistors recommendations for values and quantity

[Jack Kevorkian]

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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