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FINDER HIDDEN WIRING IN
BASIS Digital Multimeter
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(C) Mr.Linker '98
If you have a digital multimeter
with audible indication, it without a special
Labor can be turned into a hidden network finder radio
transmission or posting. But this would require the proposed
attachment.
Scheme prefix to a digital multimeter to find the hidden
power and radioprovodki shown in Fig. Its basis is the
transistor VT1 with isolated gate. Shielded wires to
connects to the input jack device.
To be able to adjust the sensitivity of the seeker, the
transistor is selected to a small initial current flow. At the
same time initial resistance of the channel can be set to feed
his gate with engine trim resistor R2 opens voltage. To protect
the gate transistor from the powerful pickups and charges
static set
diodes VD1, VD2.
Device works well. After connecting the console to a
multimeter displacement engine resistor R2 sought appearance of
monochrome signal. Then gently move it in reverse
direction until the signal loss - in this position, the device
will be provide maximum sensitivity.
If we now lead finder along the wall
hidden wiring, the place of its location in the antenna will be
induced WA1 AC voltage, the amplitude of which is enough to
transistor began to open. Channel resistance
transistor will change in time with
AC voltage. When it becomes
equal to or less than 1 ohm, a multimeter
beep, but not monotonous, but as a low-frequency trills.
Click to view <V> scheme, ss +4
(Not leaving the show) - to record
schema to disk, edit, or break - to exit the viewer.
Radio No.5 '98
(C) Yu Prokoptsov
(C) Mr. Linker
12. 12. 1998
