It has occurred to me that a thread where posters could pass on useful tips, tricks, rules-of-thumb, and conventions that may be of use for when you need a 'how to answer' not an in depth understanding. Please don't use this thread for asking questions.

I will kick off with a very simple but useful formula for making a non standard resistor by adding a

\(R_{1} = \frac{R_{2}R_{d}}{R_{2} - R_{d}}\)

\(R_{1}\) is the required

\(R_{d}\) is the desired non preferred value

\(R_{2}\) is the (next) higher preferred value

I will kick off with a very simple but useful formula for making a non standard resistor by adding a

**parallel**resistor to a standard one.\(R_{1} = \frac{R_{2}R_{d}}{R_{2} - R_{d}}\)

\(R_{1}\) is the required

**shunt resistor**\(R_{d}\) is the desired non preferred value

\(R_{2}\) is the (next) higher preferred value

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