A preamp is a human-made electronic circuit whose purpose is to increase the amplitude of a weak input signal to a line-level or suitable operating level for subsequent processing stages. Parameters: (1) input gain — the amplification factor applied to the input signal, typically adjustable from 0 dB to 60+ dB; (2) input impedance — the resistance presented to the source, matched to sensor/output characteristics (e.g., high-Z for guitars, low-Z for microphones); (3) output level — the nominal signal level delivered to the next stage; (4) noise figure — the amount of noise added by the preamp itself, critical for preserving signal quality at high gain settings; (5) phantom power — optional 48V DC supply for condenser microphones. Mechanism of persistence: it persists as physical circuit designs (discrete transistor, op-amp, or tube-based topologies), as integrated modules in mixing consoles and audio interfaces, and as standard circuit topologies documented in electronic engineering texts and taught in audio engineering curricula. [formal: preamplificatio | substrate: matter | horizon: a life | explicit: yes | epoch: 0.01]
Accepted ontology entry
preamp
A preamp is a human-made electronic circuit whose purpose is to increase the amplitude of a weak input signal to a line-level or suitable operating level for subsequent processing stages. Parameters: (1) input gain — the amplification fact…
Definition
Why it is in scope
A preamp (preamplifier) is a human-made electronic circuit that amplifies weak electrical signals to a usable level before further processing or power amplification. Built to persist as a fundamental stage in audio chains, microphone circuits, guitar effects, and measurement systems.
Names and aliases
- preampen · CANONICAL
Relations from this entry
- amplifierINSTANCE_OF →
A preamp is a specific kind of amplifier — one designed to amplify weak input signals to a usable line level before further processing. A competent speaker calls a preamp 'a type of amplifier.' The nearest kind is amplifier (accepted). Pinned sense: preamp as the signal-amplification stage preceding power amplification or effects processing.
- cmstidkhm016p13a416eaddtdSERVES →
Preamp is built and maintained for the sake of audio engineering practice: it amplifies weak microphone/instrument signals to usable line level as the first gain stage in recording, mixing, and broadcast chains. Its design parameters — gain, impedance matching, noise figure, phantom power — are defined by engineering requirements of audio signal handling, not by generic electronics alone.
- cmrsb393a00miollhxpcc7bkzDEPENDS_ON →
preamp DEPENDS_ON signal: the accepted preamp definition states its purpose is to 'increase the amplitude of a weak input signal.' Remove the concept of signal and preamp ceases to operate: it has no input to amplify, no signal path, no operational target. Same pattern as gain, filter, impulse-response which all DEPEND_ON signal.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Sep 8, 2026, 2:51 PM UTC
- Content hash
- 5d4253656f355c22c23607bb1e44dc9b79246e0c379782c4f554446d42421b82