CN85202412U

CN85202412U - Transistor meter

Info

Publication number: CN85202412U
Application number: CN 85202412
Authority: CN
Inventors: 赵雷
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-06-24
Filing date: 1985-06-24
Publication date: 1987-02-25

Abstract

The utility model relates to a bipolar pulse output complementary multi-harmonic oscillatory circuit which is a usual circuit in the electronic technology. A first stage transistor bistable circuit is in complementary connection with a first free multi-harmonic oscillatory circuit to form a bipolar pulse output complementary free multi-harmonic oscillatory circuit. A Darlington tube replaces a single tube in the circuit. The utility model can be used for the situations with large power output. The oscillation circuit has simple lines, a few members and low cost, can be widely used in the minitype portable electronic instrument devices, provides the oscillation power source and a power voltage boost device or a frequency converting device for the minitype portable electronic instrument device, and is used as the large power inverter device.

Description

Transistor meter

The utility model relates to a kind of transistor on-line testing instrument, specially refers to a kind of transistor on-line testing instrument that has bipolar pulse output multi-resonant oscillating circuit.

Ningxia trip crane pine in July 16 nineteen eighty-three on the article that is entitled as " transistor on-line testing instrument " that " Beijing electronics newspaper " third edition is delivered, a kind of transistor on-line testing instrument is disclosed, its circuit as shown in Figure 1.The double-pole switch that fiddles with during test just makes the polarity of voltage of 2 of AB change back and forth, and this voltage is through current-limiting resistance R ₁Receive indicating device-LED ₁And LED ₂On, by observing LED ₁And LED ₂Bright and dark and determine tested transistorized polarity and quality.

Obtain bipolar pulse output with manual double-pole switch, make this instrument easily measure transistorized polarity and quality, so at test process, this tester need people ceaselessly be stirred double-pole switch, this has brought inconvenience to test job.

In the utility model, introduce a kind of novel transistor on-line testing instrument, it is not to obtain bipolar pulse output with manual control, but utilizes multi-resonant oscillating circuit to obtain bipolar pulse output, not only tests effect easily but also easily thereby reach.

The purpose of this utility model is to improve existing transistor on-line testing instrument, improves the operating efficiency of transistor on-line testing instrument, reaches easily, tests easily effect really.

Fig. 2 is the basic circuit diagram of bipolar pulse output multi-resonant oscillating circuit.

The oscillating circuit of Fig. 2 is by transistor BG ₁, BG ₂, BG ₃, BG ₄, resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, capacitor C ₁, C ₂And DC power supply E forms.The latter half of circuit is the one-level astatic multivibrator, and the first half is an one-level transistor flip-flop circuit.Suppose BG ₄Elder generation's conducting, it makes BG ₃End BG ₁Conducting, and BG ₁Make BG again ₂End.At this moment BG ₁Positive level DC power supply E after the conducting is connected with the A point, and BG ₄After the conducting negative pole of E and B point are connected.Otherwise, work as BG ₃During conducting, then make BG ₄End BG ₂Conducting, BG ₂Conducting make BG again ₁End.At this moment BG ₂Conducting the positive pole of E and B point are connected and BG ₃Conducting then the negative pole of E and A point are connected.Under the control of multivibrator, realized the automatic conversion of 2 polarity of AB like this.The selected of inversion frequency is by capacitor C ₁, C ₂, resistance R ₃, R ₄, R ₅, R ₆Decision.The waveform duty cycle of multivibrator is by capacitor C ₁, C ₂, resistance R ₃, R ₄, R ₅, R ₆Symmetric parameter decide.

The described basic circuit of top Fig. 2 is to adopt free-running multivibrator and bistable circuit to be combined to form.It makes circuit-line simple, and component number is few, and cost reduces.As replacing transistor with Darlington transistor (multiple tube), just can obtain high-power output, become the oscillation source that current power is provided.This oscillator can be widely used in the small portable electronic equipment, and for it provides oscillation power, power boost device or converter plant also can be used as the high power contravariant device.

Fig. 3 is an embodiment of the present utility model.

Present embodiment is a transistor on-line testing circuit.Because test circuit is operated on off state, operating characteristic preferably when reducing the voltage loss in the circuit and obtaining low-voltage, all crystals pipe all adopts switching tube, and saturation voltage drop is had certain requirement.BG ₁, BG ₂Adopt 3CK3, Vces≤0.3V, β 〉=40.BG ₃, BG ₄Adopt 3DK4, Vces≤0.3V, BG ₅, BG ₆Adopt 3DK3, Vces≤0.5V, β 〉=100.LED ₁, LED ₂Can adopt the square type green LED of any model, general designation LED.Resistance R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, R ₇, R ₈Be respectively 1K Ω, 1K Ω, 2.4K Ω, 2.4K Ω, 1K Ω, 1K Ω, 470 Ω, 300 Ω, capacitor C ₁, C ₂Be 1 μ/16V, power supply E is 6V, adjustable resistance W ₁, W ₂Be 1K Ω.Whether the existence of the switching function that utilize judgement transistor forward conduction, oppositely ends, whether existence that utilize to judge the controlled conducting of transistor triode, the controlled switching function that ends can be found out being covered with the transistor that will not damage to sealing-off on the printed circuit board (PCB) of element.The bipolar pulse output multi-resonant oscillating circuit of having been narrated above having adopted in this tester, this oscillating circuit provides the clock of a bipolarity output.This clock is through current-limiting resistance R ₈The two ends that are added to two mutually antiparallel light emitting diode indicators of polarity form the bipolarity test pulse.When not inserting tested transistor, because the reversing of oscillation source makes LED ₁And LED ₂Alternately luminous, when the reversal frequency of oscillation source is higher than per second 16HZ when above, under the effect of the persistence of vision, can see LED ₁And LED ₂Form two continuous luminous indicating devices.W ₁, W ₂With BG ₅, BG ₆The accessory power supply that partners, it is actually two simple adjustable voltage stabilizers, can form the voltage regulation result of twocouese, and it is in the differentiating measurement circuit, and the PN junction that inserts between ce or have to be managed and is provided with.When one have to pipe receives ebc three ends of test circuit, meet the polarity chron of measured tube work in oscillation source polarity, then by V _AProvide I by R for pipe _b, transistor turns work at this moment, and pass through W ₁, BG ₅Or W ₂, BG ₆Make the bypass of LED two ends.If allow V _BG5=V _BG6, so | V _BG5|+Vce＜V _FSatisfy the condition of bypass exactly.We call formula 1 to it.VBG in the formula 1 ₅Be BG ₅The forward voltage at c, e the two poles of the earth, Vce are the voltage after the measured tube conducting, V _FBeing the forward luminous voltage of light-emitting diode, in other words, is exactly the conducting effect of measured tube, can bypass the LED two ends.When for example surveying a NPN and managing well, oscillation source polarity A for just, B when negative, V _APass through R ₇For pipe provides I _b, NPN manages conducting, at this moment V _GBDescend LED ₂By bypass, LED ₁Be in instead partially, two LED do not work.When oscillation source change polarity be B just, when A is negative, LED ₂Be in instead and do not work partially, because measured tube instead ends partially, this just makes the LED that is in positively biased ₁Bright.This test result represents that measured tube is the good pipe of a NPN type.Identical therewith analysis is a PNP when managing well when measured tube as can be known, and display result is LED ₁Go out LED ₂Bright.

If the measured tube that is connected in the test circuit is the pipe of a ce internal short-circuit, because accessory power supply W ₁BG ₅, W ₂BG ₆The bypass effect be twocouese, so regardless of the polarity of oscillation source, two LED do not work.

State in the time of in like manner can analyzing the bc of measured tube or be short circuit, just the ce two ends are that the test result of a PN junction is that two LED are bright in the test circuit.

Through the analysis of above test philosophy, we are divided into several different classifications to the test phenomenon, list the show state to residing state of measured tube and LED, it is concluded sum up, and obtain Fig. 4.

Fig. 4 is the practical classification chart of the online tester of transistor. Wherein: good is " good ", and no is " bad ";^＊For LED bright; For LED goes out; Be green rectangle friend optical diode. This table uses very easy. For example when testing, we see LED₁Bright, LED₂When going out, just can confirm that it is the good pipe of a NPN. If LED₁Go out, LED₂Bright, measured tube must be that a PNP manages well so. Two LED go out or bright when when test, no matter just its pipe type at this moment, being judged as without exception is a bad pipe.

Rely on the online tester of this transistor, we just can find out the transistor that loses the switch function easily.

Claims

1, transistor on-line testing instrument, comprise several pressurizers and indicating device, the bipolar pulse output oscillating circuit that has a control polarity of voltage to change back and forth, of the present utility model being characterised in that: in the bipolar pulse output multi-resonant oscillating circuit one-level flip-flop circuit is arranged, and flip-flop circuit takes complimentary fashion to be connected in output with the one-level multivibrator, and all circuit is made up of four transistors.

2, transistor on-line testing instrument according to claim 1 is characterized in that: one-level flip-flop circuit in the bipolar pulse output multi-resonant oscillating circuit and the transistor in the one-level multi-resonant oscillating circuit replace by reaching the woods pipe.