Definition
A transformer placed between two amplifier stages in an electronic circuit, used to couple the output of one stage to the input of the next while providing voltage change and impedance matching between them.
Plain English
A small transformer that sits between two amplifier sections inside a piece of electronic equipment, passing the signal from one section to the next and adjusting it so the two sections work well together.
Context Anchor
Seen in aircraft radio, audio, and other electronic equipment discussions, especially in maintenance or troubleshooting.
Derivation
From Latin 'inter' meaning 'between' and 'stage' referring to one section of an amplifier. The name simply tells you where it sits — between stages — and what it does — transforms the signal as it passes through.
Why Pilots Care
A working interstage transformer ensures reliable high-voltage sparks for consistent engine starting and smooth operation; failure can produce weak or intermittent sparks leading to rough running or hard starts.
Analogy
It is like a handoff point between two workers on an assembly line: one section finishes its part, and the handoff passes the work to the next section in a usable form.
Intuition Check
Do not read “interstage” as a physical location between floors or platforms. Here it means between two working sections of an electronic circuit.
Example Sentence 1
The technician traced the weak audio output to a failed interstage transformer in the receiver.
Example Sentence 2
A damaged interstage transformer caused weak sparks and required replacement before the annual inspection could be signed off.