The best replacement for circuits is sets.

The best alternatives to circuits are rated as following:
★★★★★  sets
★★★★  series circuits
★★★  parallel circuits
★★★  dc circuits
★★  spaces
★★  series
★★  digital circuits
★  analog circuits
★  parallel
★  little bits
★  closed circuits
★  hot wires
★  open circuits
★  axle counters
  ac circuits
  asynchronous circuits
  sequential circuits
  magnetic circuits
  circuits
  ic
  series circuit
  discrete components

Your alternative for circuits is not listed? Suggest!
Speaking about circuits, one probably shouldn't forget about resistors.

Other search terms related to circuits and their ratings are:
★★★★★ resistors
★★ transistors
★ machines
★ leds
★ operational amplifiers
You have in mind a companion for circuits and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of circuits in all years. Click on graph for more.
circuits
sets
series circuits