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Breadboard Tip : Use Variable Resistors for Everything
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Breadboard Tip : Use Variable Resistors for Everything

by tkinsman on Tue Jun 18, 2019 9:43 am

I have a strategy for building circuits which helps me get circuits working much faster.

When trying a new circuit on a breadboard I do the following:

1. Replace all the fixed resistors with variable resistors that are about the same as the fixed resistor.
For example, 2 Kilo-ohm (2K) resistor --> 10K variable resistor (potentiometer).

2. Set all of the variable resistors to mid-range. (To avoid shorting out anything.)
[If you are working with students, you can add a "guard" resistor in series to avoid ever going to zero ohms.]

3. Adjust all resistors until you get the circuit working as best you can.
But be careful not to use the smallest setting, to avoid shorting out the circuit.

4. Once adjusted, use a multi-meter to measure the variable resistors, and replace them with an equivalent fixed resistor.
For example, if the variable resistor measures 520 ohms, use 470 ohm resistor.

Best Regards,

- Thomas

tkinsman
 
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Joined: Sun Sep 25, 2016 2:04 pm

Please be positive and constructive with your questions and comments.