Ramsey Electronics SCA1, Руководство пользователя

Страница: 18 / 20

SCA1
•
18
•
PROBLEM: Audio is good from the Low Level output jack, J2, but no
speaker audio.
•
SOLUTION: Check all circuitry around U2, the audio amplifier section.
•
PROBLEM: Unit has low frequency "growl," squeal or erratic operation
when volume is turned up.
•
SOLUTION: It’s nothing more than a dead battery. When the audio
amplifier draws peaks of current on loud sounds, its voltage temporarily
falls, causing the PLL circuit to drop lock.
A careful check of all construction will solve your problem. Over 95% of the
kits returned for repair have nothing more than a simple assembly or
construction error! Have another pair of eyes check your work first.
ENCLOSURE IDEAS
While we believe that the Ramsey enclosure and knob option is a fine value
for finishing off your Ramsey receiver or transmitter, we are happy to give you
an alternate suggestion. If your first goal is economy and rugged portability,
you will find that the circuit board can be mounted nicely in a standard VHS
videotape storage box, which also gives room for a speaker, or earphone
storage, and even a set of connection cables. The controls are easily mounted
at one end of such a box. It may be necessary to cut away the molded posts
which secure the tape cassette itself. These storage boxes come in several
styles, so pick one that looks truly practical as a project enclosure.