February 2016
Intermediate to advanced
216 pages
14h 38m
English
Content preview from Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition
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128
Head circuits
Head impedance Separate heads are connected directly to
their respective amplifiers, the record head to the output of the
recording amplifier and also to the bias oscillator, while the
playback head is connected to the input of the playback
amplifier. Impedances can thus be optimised. Magnetic flux is
proportional to current flowing in the head coils and is not
affected by voltage. So low impedance is needed for the record
head to permit the required current to flow: it also best matches
the recording amplifier output.
For playback, the recorded flux produces an
e.m.f.
(voltage)
in the head coils. To present a high signal
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