Bridge Circuit. The bridge comprises four resistors and two capacitors the oscillator can also be viewed as a positive gain amplifier combined with a bandpass. The diode bridge is also available in a single package.
You normally use it with a microcontroller such as an arduino to control motors. When the current through the galvanometer becomes zero the ratio of two known. Teign gorge classic circuit.
A wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit one leg of which includes the unknown component the primary benefit of the circuit is its ability to provide extremely accurate measurements in contrast with something like a simple voltage divider.
When the current through the galvanometer becomes zero the ratio of two known. For measuring accurately any electrical resistance wheatstone bridge is widely used. Perhaps the most famous walk on dartmoor. When you can control two motors to go either forward or backward you can build yourself a robot.