CN202275128U

CN202275128U - Pocket electronic wire tracker circuit

Info

Publication number: CN202275128U
Application number: CN2011203954210U
Authority: CN
Inventors: 王德如
Original assignee: WUHU SHENLONG NEW ENERGY TECHNOLOGY CO LTD
Current assignee: WUHU SHENLONG NEW ENERGY TECHNOLOGY CO LTD
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2012-06-13
Anticipated expiration: 2021-10-18

Abstract

The utility model relates to a pocket electronic wire tracker circuit which comprises a series branch 1 and a series branch 2, wherein the series branch 1 is formed by electrically connecting a resistor R and the drain D of a field-effect transistor VT; the series branch 2 is formed by electrically connecting the negative pole of a light-emitting diode VD1 and the positive pole of a crystal diode VD 2; the series branch 1 and the series branch 2 are electrically connected with each other in parallel; the source S of the field-effect transistor VT and the negative pole of the crystal diode VD2 are electrically connected to the negative pole of a direct current power supply E; the positive pole of the light-emitting diode VD1 is electrically connected with the positive pole of the direct current power supply E; the drain D of the field-effect transistor VT is also electrically connected with the positive pole of the direct current power supply E; a capacitor C is connected between the drain D of the field-effect transistor VT and the positive pole of the crystal diode VD2 in series; the branch of the direct current power supply E is also connected with a switch K in series; and the gate G of the field-effect transistor VT is electrically connected with an induction metal sheet M. The utility model can quickly and effectively detect disconnection of a circuit which is concealed in the wall, and can detect the breakpoint of the disconnection circuit, thereby effectively enhancing the work efficiency of detection and maintenance.

Description

Pocket-size electronic testing device circuit

Technical field

The utility model relates to a kind of circuit of circuit checker, relates in particular to a kind of pocket-size electronic testing device circuit that secretly applies the situation of cut-offfing at circuit within the walls that detects.

Background technology

Existing concealed wire circuit checker has numeral induction electroprobe, and whether have electricity, or the induced voltage of circuit if can detect the circuit that secretly applies within the walls, but can't correctly detect the breakpoint of broken string circuit, can not bring substantive help to line maintenance work.In order to find out the breakpoint of broken string circuit fast, make things convenient for the line maintenance personnel that the broken string circuit is keeped in repair, just need a kind of circuit checker that can detect broken string circuit breakpoint easily and quickly.

The utility model content

Whether the purpose of the utility model provides a kind of pocket-size electronic testing device circuit, can only detect secretly to apply within the walls circuit and open circuit and can not further detect the problem of the breakpoint of broken string circuit to solve prior art.

For achieving the above object, the technical scheme that the utility model adopts is:

A kind of pocket-size electronic testing device circuit; It is characterized in that: comprise the series arm one that resistance R and FET VT drain D are electrically connected to form; The series arm two that light emitting diode VD1 negative pole and crystal diode VD2 positive electrical connect and compose; Said series arm one is electrically connected with series arm two is parallelly connected each other, and said FET VT source S and crystal diode VD2 negative electricity are connected on the direct supply E negative pole, and said light emitting diode VD1 positive electrical is connected on the direct supply E positive pole; Said FET VT drain D also is connected electrically on the direct supply E positive pole through resistance R; Be in series with capacitor C between said FET VT drain D and the crystal diode VD2 positive pole, also be in series with K switch on the branch road of said direct supply E place, be electrically connected with induction metal plate M on the said FET VT grid G.

The beneficial effect of the utility model is:

Whether the utility model can detect the circuit that secretly applies within the walls quickly and efficiently and break, and can detect the breakpoint of broken string circuit, has improved the work efficiency that detects maintenance effectively; And the utility model is simple in structure, and is easy to operate, and cost is low; Finished-product volume is little, is easy to carry.

Description of drawings

Fig. 1 is the utility model circuit theory diagrams.

Embodiment

As shown in Figure 1; The utility model comprises the series arm one that resistance R and FET VT drain D are electrically connected to form; The series arm two that light emitting diode VD1 negative pole and crystal diode VD2 positive electrical connect and compose; Series arm one is electrically connected with series arm two is parallelly connected each other, and FET VT source S and crystal diode VD2 negative electricity are connected on the direct supply E negative pole, and light emitting diode VD1 positive electrical is connected on the direct supply E positive pole; FET VT drain D also is connected electrically on the direct supply E positive pole through resistance R; Be in series with capacitor C between FET VT drain D and the crystal diode VD2 positive pole, also be in series with K switch on the branch road of direct supply E place, be electrically connected with induction metal plate M on the FET VT grid G.

FET VT selects 3DJ6 or the common JFET of 3DJ7 type for use; Require saturated drain current less than 1 milliampere; Light emitting diode VD1 must select the super brightness red light emitting diodes of 5 millimeters of diameters for use, and crystal diode VD2 selects the 2AP9 germanium diode of the about 0.2V of forward conduction voltage for use, and resistance R adopts the 1/8W carbon resister; Capacitor C adopts the 10M10V electrochemical capacitor; Switch S adopts 6 millimeters minitype vertical type touch-switchs of 6 millimeters *, and also available phosphorus bronze sheet bends voluntarily, and direct supply E adopts miniature Ag-oxide button cell to dwindle overall volume.

Induction metal plate M and FET VT, resistance R is formed the inductive ac signal amplifier, and capacitor C and light emitting diode VD1, crystal diode VD2 form AC signal voltage multiplication light display circuit.

When not carrying out testing, press the K switch of testing device, because of FET VT is in zero inclined to one side state; Be conducting state all the time between its drain D and source S; Capacitor C does not have ac signal output, since the about 1.6V of light emitting diode VD1 forward conduction voltage drop, the about 0.2V of crystal diode VD2 forward conduction voltage drop; About the optional 1.8V of forward conduction voltage drop after both series connection, so the battery of 1.5V can not directly make VD1 light.

When testing device during near the 220V AC power cord; The induction metal plate M that is electrically connected with FET VT grid G will sense faint ac voltage signal; Thereby make FET VT with the continuous conducting of the frequency of 50HZ with end; Control capacitance C constantly charges through resistance R and crystal diode VD2, constantly discharges through FET VT, direct supply E (voltage of direct supply E and capacitor C two ends charging voltage stack here, peak pressure can reach 2.7V) and light emitting diode VD1 again; Thereby it is luminous to make light emitting diode VD1 obtain the conducting of proper operation voltage, thereby detects the breakpoint location of broken string circuit.

Claims

1. pocket-size electronic testing device circuit; It is characterized in that: comprise the series arm one that resistance R and FET VT drain D are electrically connected to form; The series arm two that light emitting diode VD1 negative pole and crystal diode VD2 positive electrical connect and compose; Said series arm one is electrically connected with series arm two is parallelly connected each other, and said FET VT source S and crystal diode VD2 negative electricity are connected on the direct supply E negative pole, and said light emitting diode VD1 positive electrical is connected on the direct supply E positive pole; Said FET VT drain D also is connected electrically on the direct supply E positive pole through resistance R; Be in series with capacitor C between said FET VT drain D and the crystal diode VD2 positive pole, also be in series with K switch on the branch road of said direct supply E place, be electrically connected with induction metal plate M on the said FET VT grid G.