« Back to Dictionary Index

In electronics, “back-to-back” typically refers to a configuration where components are connected in such a way that their polarities or orientations are opposite to each other.

Valve (Tube) Configuration:

  • Definition: In the context of vacuum tubes (valves), back-to-back refers to connecting two tubes in parallel but with opposite polarity or orientation.
  • Connection: The anode of one tube is connected to the cathode of the other tube. This configuration allows for the control of AC current without the need for rectification, as the tubes effectively handle the alternating current in both directions.
  • Purpose: Used in applications where AC signal handling or AC power switching is required without converting AC to DC. Each tube in the back-to-back configuration handles the alternating current cycle in opposite phases.

Transistor Configuration:

  • Definition: In transistor circuits, back-to-back connection involves connecting transistors in parallel but with opposite directions or polarities.
  • Usage: Often used in circuits where bidirectional signal handling is necessary, such as in AC signal amplification or switching applications.
  • Example: Transistors can be connected emitter-to-emitter and collector-to-collector with their bases connected together. This configuration allows the transistors to conduct in opposite directions when appropriate signals are applied.

Applications:

  • AC Signal Control: Allows for handling AC signals directly without the need for additional rectification circuits.
  • Switching Circuits: Used in bidirectional switching applications where both positive and negative polarity control is required.

“Back-to-back” configurations are common in electronics for handling AC signals or power efficiently without rectification. Whether in vacuum tubes or transistor circuits, this setup enables effective bidirectional control and amplification of alternating currents, making it valuable in various electronic applications requiring AC signal handling capabilities.

Related Articles:
« Back to Dictionary Index