Substituting parts

[Clubman35]

when substituting parts, how close do you need to be to the original value? Ex. I need a 51K resistor, the closest I have is a 47K....will this be ok? Many thanks.

[jrem]

depends on the circuit, I would try it and see what your results are.  If you have a voltage reference on the scematic then you can check and see how far off you are.

Usually it's horseshoes and handgrenades, being close scores.  Hmm, maybe there's a song there.  But if you're making 3ghz pc mobo's then you're going to need the right components and play games with board traces.

[MartyMart]

I've built many circuits with "as close as" values and have not had any "operation" problems as yet !
I do sometimes go for "exact" values, so your 47k with a 3k3 or 4k7 in series would be good enough

MM