Vectronics VEC-483K - Manual

VEC-483K Owner’s Manual Voice Activated Tape Recorder Switch
1
INTRODUCTION
General Information: Ever wish you could edit the "dead air time" from tape
recordings of meetings, speeches, interviews, etc? Now you can do it while you
record with the VEC-483K Voice Activated Tape Recorder Switch Kit. With
voice activation, you save money by recording more information on each tape--
and you save valuable listening time during playback because every inch of tape
is filled with information. In addition to voice-activating your recorder, the
VEC-483K helps you make better quality recordings because it places a high-
quality electret microphone near the sound source, and far away from the noisy
tape transport mechanism in your machine.
Circuitry: The VEC-483K has two parts. First, a sensitive electret microphone
picks up sound and sends it to your recorder via the external microphone jack.
Second, a high-gain op-amp samples the microphone signal, amplifies it, and
then detects it--using the detector level to drive a FET switch. This switch, in
turn, activates and pauses your recorder via the remote jack. Sensitivity and
hold-delay are both adjustable to your liking. The unit is internally powered by a
long-lasting 9-volt alkaline battery.
TOOLS AND SUPPLIES
Construction Area: Kit construction requires a clean, smooth, and well-lighted
area where you can easily organize and handle small parts without losing them.
An inexpensive sheet of white poster board makes an excellent construction
surface, while providing protection for the underlying table or desk. Diffused
overhead lighting is a plus, and a supplemental high-intensity desk lamp is
especially helpful for close-up work. Safety is always important! Use a suitable
high-temperature stand for your soldering iron, and keep the work area free of
clutter.
Universal Kit-building Tools: No special tools are required to complete this
kit beyond common items normally used for bench construction. We
recommend the following:
! Soldering Iron (grounded-tip and temperature-controlled preferred)
! High-temperature Iron Holder with Cleaning Sponge
! Solder, 60/40 or 63/37 with rosin or "no-clean" flux (.031" dia. is good
size).
! Needle Nose Pliers or Surgical Hemostats
! Diagonal Cutters or "Nippy Cutters"
! Solder Sucker (squeeze or vacuum pump type), or Desoldering Braid