CN203672998U

CN203672998U - Performance detection instrument of crystal oscillator

Info

Publication number: CN203672998U
Application number: CN201420049560.1U
Authority: CN
Inventors: 吴建堂
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-01-24
Filing date: 2014-01-24
Publication date: 2014-06-25
Anticipated expiration: 2024-01-24

Abstract

The utility model relates to a performance detection instrument of a crystal oscillator. The performance detection instrument is characterized in that the instrument is composed of a 9-V direct-current power supply, a multi-frequency oscillation circuit, a voltage-doubling detection and filtering circuit, a direct-current amplifier and test result showing circuit. The multi-frequency oscillation circuit consists of a tested crystal oscillator BC, a resistor R1, an NPN type transistor BG1, a capacitor C1, a capacitor C2, and a resistor R2; and the voltage-doubling detection and filtering circuit includes a capacitor C3, two germanium diodes D1 and D2, an electrolytic capacitor C4 and a capacitor C5, wherein the types of the two germanium diodes D1 and D2 are 2AP30E. And the direct-current amplifier and test result showing circuit includes an NPN type transistor BG2 and a light-emitting diode LED. According to the scheme, when a technicist carries out maintenance, whether crystal oscillators in circuits of various infrared remote controllers, USB flash disks, and MP3 players and the like are damaged or not can be tested conveniently and accurately, thereby bringing convenience for repairing electronic equipment rapidly.

Description

Crystal oscillator performance detector

Technical field

The utility model belongs to electronic devices and components technical field of measurement and test, is about a kind of crystal oscillator performance detector.

Background technology

Quartz oscillator is also referred to as crystal oscillator, is commonly called as: crystal oscillator, it is to utilize the quartz crystal slice with piezoelectric effect to make.The used time of doing that this quartz crystal is subject to applied alternating field can produce mechanical vibration, and in the time that the frequency of alternating electric field is identical with the natural frequency of crystal oscillator, vibration just becomes very strong, the characteristic of crystal resonance characteristic that Here it is.Utilize this specific character of crystal oscillator, available crystal oscillator replaces LC(coil and electric capacity) resonant tank, wave filter etc.Because crystal resonator has, volume is little, lightweight, reliability is high, frequency stability advantages of higher, and crystal oscillator is widely used in the electronic equipments such as televisor, video disc player, wireless telecommunications system, electronic watch.

In electrical maintenance process, often run into the phenomenon of infrared remote controller functional failure.How to judge the crystal oscillator performance in infrared remote controller, be difficult to judge whether crystal oscillator exists fault with general multimeter.It can survey frequency be 220KHz～95MHz crystal oscillator proving installation that crystal oscillator performance detector described in the utility model utilizes ordinary electronic element to make one, it is that technician is in the time of maintenance, whether the crystal oscillator that can test easily and accurately in the circuit such as various infrared remote controllers, USB flash disk, MP3 damages, crystal oscillator performance quality is very clear, provides convenience for repairing rapidly electronic equipment.

Below describe crystal oscillator performance detector described in the utility model related relevant technologies content in implementation process in detail.

Utility model content

Goal of the invention and beneficial effect: in electrical maintenance process, often run into the phenomenon of the functional failure of infrared remote controller.How to judge the crystal oscillator performance in infrared remote controller, be difficult to judge whether crystal oscillator exists fault with general multimeter.It can survey frequency be 220KHz～95MHz crystal oscillator proving installation that crystal oscillator performance detector described in the utility model utilizes ordinary electronic elements to make one, it is that technician is in the time of maintenance, whether the crystal oscillator of can facilitate, accurately testing in the circuit such as various infrared remote controllers, USB flash disk, MP3 damages, crystal oscillator performance quality is very clear, provides convenience for promptly repairing electronic equipment.

Circuit working principle: crystal oscillator performance detector forms multi-frequency oscillation circuit by NPN transistor BG1 and Resistor-Capacitor Unit, the emitter output oscillating voltage of NPN transistor BG1 carries out after multiplication of voltage detection through capacitor C 3, germanium diode D1～D2, obtain > 0.75V DC voltage at the two ends of electrochemical capacitor C4, it is luminous that driving N PN transistor npn npn BG2 lights LED; If tested crystal oscillator BC damages, because multi-frequency oscillation circuit cisco unity malfunction, multiplication of voltage detecting circuit will be without direct voltage output, so LED can not be lit.Whether light luminously by observing LED, judge whether starting of oscillation of crystal oscillator, simultaneously the size of observation and comparison oscillation amplitude.

Technical scheme: crystal oscillator performance detector, it comprises that 9V direct supply, multi-frequency oscillation circuit, multiplication of voltage detection and filtering circuit, direct current amplify and test result display circuit, is characterized in that:

Multi-frequency oscillation circuit: it is by tested crystal oscillator BC, resistance R 1, NPN transistor BG1, capacitor C 1, capacitor C 2 and resistance R 2 form, one end of the base stage connecting resistance R1 of NPN transistor BG1, one end of one end of capacitor C 1 and tested crystal oscillator BC, the anodal VCC of collector connection circuit of the other end of resistance R 1 and NPN transistor BG1, the emitter of the other end of capacitor C 1 and NPN transistor BG1 connects one end of capacitor C 2 and one end of resistance R 2, the other end connection circuit ground GND of the other end of the other end of tested crystal oscillator BC and capacitor C 2 and resistance R 2,

Multiplication of voltage detection and filtering circuit: it is made up of

capacitor C

3,2 germanium diode D1～D2, electrochemical capacitor C4 and capacitor C 5, the model that 2 germanium diode D1～D2 select is 2AP30E, the emitter of NPN transistor BG1 connects the negative pole of germanium diode D1 and the positive pole of germanium diode D2 by capacitor C 3, the negative pole of germanium diode D2 connects the positive pole of electrochemical capacitor C4 and one end of capacitor C 5, the negative pole of the positive pole of germanium diode D1 and electrochemical capacitor C4 and the other end connection circuit of capacitor C 5 ground GND;

Direct current amplifies and test result display circuit: it is made up of NPN transistor BG2 and LED, the base stage of NPN transistor BG2 connects the negative pole of germanium diode D2, the collector of NPN transistor BG2 connects the negative pole of LED, the anodal VCC of anodal connection circuit of LED, the emitter connection circuit ground GND of NPN transistor BG2;

The positive pole of 9V direct supply is connected with circuit anode VCC, and the negative pole of 9V direct supply is connected with circuit ground GND.

Brief description of the drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a crystal oscillator performance detector.

Embodiment

According to crystal oscillator performance detector circuit working schematic diagram and brief description of the drawings shown in accompanying drawing 1, and according to annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in embodiment requires and circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.

The technical parameter of components and parts and selection requirement

BG1, BG2 are NPN transistor, and the model of selecting is 2SC9018, requires β >=160;

D1～D2 is germanium diode, and the model of selecting is 2AP30E;

The resistance of resistance R 1 is 62K Ω, and the resistance of resistance R 2 is 1.1K Ω;

Require following 4 electric capacity all to use Leaded Ceramic Disc Capacitor, the capacity of capacitor C 1 is 30PF; The capacity of capacitor C 2 is 18PF; The capacity of capacitor C 3 is 2200PF; The capacity of capacitor C 5 is 1800PF;

C4 is electrochemical capacitor, and its capacity is 0.68 μ F/10V;

LED is light emitting diode, selects the common red light emitting diodes of diameter ￠ 5mm;

BC is tested crystal oscillator, frequency range 220KHz～95MHz.

Circuit production main points, circuit debugging and using method

Because of the circuit structure of crystal oscillator performance detector fairly simple, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing 1 is welded to specifications, physical connection line and welding quality are after careful inspection is correct, and circuit of the present utility model does not substantially need to carry out any debugging and can normally work;

Two pins that on the make should be noted that tested crystal oscillator BC can not be too near apart, otherwise oscillation amplitude will be influenced, likely causes LED not to be lit, thereby affect the test result of tested crystal oscillator BC performance;

Use respectively 429KHz; 455KHz; 4.OOOMHz; 11.160MHz; 12.000MHz; 24.00MHz; 37.00MHz; The crystal oscillator place in circuit of 94.75MHz is starting of oscillation smoothly all;

In the feed circuit of 9V direct supply, can increase if desired electrochemical capacitor and radioceramic Jie capacitor filter.

Claims

1. a crystal oscillator performance detector, it comprises that 9V direct supply, multi-frequency oscillation circuit, multiplication of voltage detection and filtering circuit, direct current amplify and test result display circuit, is characterized in that:

Described multi-frequency oscillation circuit is by tested crystal oscillator BC, resistance R 1, NPN transistor BG1, capacitor C 1, capacitor C 2 and resistance R 2 form, one end of the base stage connecting resistance R1 of NPN transistor BG1, one end of one end of capacitor C 1 and tested crystal oscillator BC, the anodal VCC of collector connection circuit of the other end of resistance R 1 and NPN transistor BG1, the emitter of the other end of capacitor C 1 and NPN transistor BG1 connects one end of capacitor C 2 and one end of resistance R 2, the other end connection circuit ground GND of the other end of the other end of tested crystal oscillator BC and capacitor C 2 and resistance R 2,

Described multiplication of voltage detection and filtering circuit are made up of capacitor C 3,2 germanium diode D1～D2, electrochemical capacitor C4 and capacitor C 5, the model that 2 germanium diode D1～D2 select is 2AP30E, the emitter of NPN transistor BG1 connects the negative pole of germanium diode D1 and the positive pole of germanium diode D2 by capacitor C 3, the negative pole of germanium diode D2 connects the positive pole of electrochemical capacitor C4 and one end of capacitor C 5, the negative pole of the positive pole of germanium diode D1 and electrochemical capacitor C4 and the other end connection circuit of capacitor C 5 ground GND;

Described direct current amplifies and test result display circuit is made up of NPN transistor BG2 and LED, the base stage of NPN transistor BG2 connects the negative pole of germanium diode D2, the collector of NPN transistor BG2 connects the negative pole of LED, the anodal VCC of anodal connection circuit of LED, the emitter connection circuit ground GND of NPN transistor BG2;

The positive pole of described 9V direct supply is connected with circuit anode VCC, and the negative pole of 9V direct supply is connected with circuit ground GND.