High Precision Modular Analog Circuit Experiment Box With Safety Protection For Vocational School Teaching

System Features

1. High expandability: The experimental circuits are designed in the form of unit circuits, which serve as basic experimental circuits. By connecting external components to adjust circuit parameters or combining with other unit circuits, different experimental requirements can be met.

2. Experimental schematics are printed on the surface of the experiment board. Students build experimental circuits in accordance with the schematics, which not only cultivates their independent thinking and practical abilities but also enhances the applicability and expandability of the experiment box.

3. Components are mounted on the reverse side of the experiment board to reduce man-made damage to the components.

4. The jacks for experimental wiring adopt stacked self-locking gold-plated jacks, which are fixed on the experiment board by welding, featuring no loosening, no oxidation, long service life, reliable connection, and convenient and simple maintenance.

5. There is a discrete component plug-in area for plugging in resistors, capacitors, diodes, triodes, integrated circuits, etc., enabling curriculum design experiments.

6. All power supply outputs are equipped with overcurrent protection and automatic recovery functions.

7. The experiment box is made of integrated aluminum alloy profiles, with a firm and reliable body that does not deform and is light in weight. It has good insulation and safety performance, convenient and reliable switch of the box cover, as well as an attractive and grand appearance.

8. The system is equipped with the circuit design and simulation software - Electronics.Workbench.Multisim.v9.0, which helps students conduct simulation tests first when designing experimental circuits independently to improve the design success rate.

System Composition

Power Supply:

Input: AC 220V±10%, 50HZ

Output:

DC: +5V, DC I≥1A

DC: -5V, DC I≥0.5A

DC: ±12V, DC I≥0.2A

DC: -5V～-12V adjustable, I≥0.2A

DC: +5V～+27V adjustable, DC I≥0.2A

All the above output channels are equipped with overcurrent protection and automatic recovery functions.

AC V: 7.5V×2; AC I≥0.15A

DC Signal Source:

Dual-channel, continuously adjustable in two gears: -0.5V～+0.5V and -5V～+5V.

Function Generator:

Output frequency: 2Hz～90KHz, divided into four gears;

Usable outputs:

Square wave: 0～20V

Triangular wave: 0～15V

Sine wave: 0～10V

Digital Frequency Counter (0～300KHz)

Digital DC Voltmeter (0～30V)

Discrete Component Circuits:

(1) Rectifier, filter and series voltage regulator circuits; (2) Single-stage amplifier circuit; (3) Two-stage RC coupled amplifier circuit;

(4) Negative feedback amplifier circuit; (5) Emitter follower; (6) Differential amplifier circuit; (7) Complementary symmetric power amplifier circuit;

(8) Field effect transistor circuit; (9) Circuits composed of resistors, capacitors, diodes, triodes, etc.;

(10) Potentiometer bank, 12V light bulb, speaker.

Integrated Analog Circuits:

(1) Two independent operational amplifiers (741); (2) Integrated power amplifier (LM386); (3) Integrated voltage regulator circuit.

Discrete Component Plug-in Area:

(1) Provides sockets for 20 resistance-capacitance components, 2 triodes, 4 diodes and voltage regulator diodes.

(2) Provides 1 20-pin locking socket.

This design is mainly intended to enable students to design and build experimental circuits independently, thus cultivating their practical abilities.

Dimension of the Experiment Box: 510mm×330mm×100mm (Length×Width×Height)

Laboratory Safety Management System Software (Genuine software; the original copyright certificate and on-site item-by-item parameter demonstration shall be provided in the bidding document! One set for the entire training room!):

(1) The system integrates a wireless remote experiment bench power management system. Through mobile phones or other mobile terminal systems, it can monitor and query the power switch status of students' experiment benches, turn on/off the power of a single student's experiment bench, turn on/off the power of all experiment benches, and support the timed reservation function for power on/off of experiment benches.

(2) Under WiFi connection, teachers can read the current, voltage, power factor and other parameters of the training bench in real time and at high speed through the mobile APP; it can display the equipment operating power and historical curves in real time, and monitor the equipment operation status, fault early warning and abnormal alarm in real time.

(3) The protection voltage and current of the experiment bench can be set. When the input voltage or current exceeds the protection values, the power supply of the experiment bench will be cut off automatically to protect the equipment, and a message will be pushed to the teacher's control terminal.

Experimental Projects

1. Practice on the use of common electronic instruments, testing of diodes and triodes with a multimeter

2. Single-stage amplifier circuit

3. Two-stage amplifier circuit

4. Negative feedback amplifier circuit

5. Emitter follower

6. Differential amplifier circuit

7. Proportional summing operation circuit

8. Integral and differential circuit

9. Waveform generation circuit

10. Active filter

11. Voltage comparator

12. Integrated circuit RC sine wave oscillator

13. Integrated power amplifier

14. Rectifier filter and shunt voltage regulator circuit

15. Series voltage regulator circuit

16. Integrated voltage regulator

17. RC sine wave oscillator

18. LC oscillator and frequency-selective amplifier

19. Current/voltage conversion circuit

20. Voltage/frequency conversion circuit

21. Complementary symmetric power amplifier

22. Waveform conversion circuit

23. Field effect transistor experiment

24. Thyristor experimental circuit

Comprehensive Experiments

1. Assembly and debugging of function signal generator

2. Temperature monitoring and control circuit

3. Design and debugging of a multimeter composed of operational amplifiers