Digital circuit experimental device

 

Digital circuit learning machines, the host provides a variety of signal sources; the front printing character is connected, and the negative is equipped with components. All circuits and other circuits of all signal source meters are composed of CPLD chips and dual -panels. The quality of the machine is improved. Because components are installed on the back, it can effectively reduce and avoid human damage. The features are characterized by: easy to use, durable, flexible experimental items, and convenient for digital simulation of various experiments. This learning machine is suitable for electronic technology teaching in colleges and universities and various vocational and technical schools.

 

1. System composition

 

(1) Structure: Aluminum alloy framework, fire prevention material, environmentally friendly glue, handle, reliable quality, solid and durable.

 

(2) Power: AC input: 220V ± 10%, 50Hz, the power switch with LED light indication

 

DC output: ± 12V/200mA, 5V/2A

 

There are protection measures such as overcurrent, short -circuit, and overheating on each output above. The automatic recovery function is less than 0.1 ohm.

 

(2) Group 2 of the manual monoclonal circuit: two positive and negative pulse can be output at the same time, and the pulse amplitude is TTL level.

 

(3) A group of continuous pulses, output to TTL level:

 

Fixed frequency pulse source: 1Hz, 1kHz, 10kHz, 100kHz, 1MHz;

 

(4) Six-digit high-precision digital frequency meter, measurement range: 0-9.9999MHz error <1Hz (design by CPLD chip)

 

(5) Input and display of logic levels:

 

A and 12 independent logic electric flat switches: "0" and "1" levels can be output (as positive logic).

 

B. 12 -bit logical level display circuit composed of red LED and driving circuits.

 

(6) Digital tube display:

 

A, 4 -digit BCD code decoding display circuit composed of eight -segment LED digital tube;

 

B, 1 -bit eight -segment LED digital tube, all pins lead, for digital tube experiments.

 

(7) 4 sequential generator and start -stop control circuit.

 

(8) 21 round sockets such as 8 cores, 14 cores, 16 cores, 20 cores, 28 cores, etc., which can meet various IC chips

 

(9) 4 resistance potentiometers.

Device features:

1. Pressure power components use st--nless steel multi -level high -pressure centrifugal pumps. It has the advantages of high pressure, high efficiency, corrosion resistance, and strong self -absorbing ability. Pressure and flow can be freely adjusted.

2. The overall structure is compact, the operation is simple, and the running volume is small.

3. The system adopts transparent plastic pipelines and accessories, with high pressure, corrosion resistance, and sealing.

Device function:

1. Reflected the basic structure and process of membrane separation components.

2. System experiments that can be performed by four types of membrane separation processes of ultrafiltration, micro filtering, reverse osmodility filtering, and natal filtering; master the adaptation range and operation method of 4 kinds of membranes.

3. Calculate the recovery rate and dehydration rate according to the flow of water inlet, thick water and water purification and salt content; the m--n factors and its influence laws that affect the separation of reverse osmosis membranes.

M--n configuration:

Sinking sink, raw water sink, high -pressure pump, centrifugal pump, pre -filter, reverse osmosis membrane component, nan filter membrane component, ultrafiltration component, micro filter membrane component, pressure gauge Pipelines, valves, high -quality aluminum alloy profile frameworks.

public facilities:

Water: The device comes with a water tank and connects tap water. During the experiment, the water tank was pumped into the system and was used by the cycle.

Electric: voltage AC380V, power 2.0kW, standard three -phase and four -line system. Each laboratory needs to be configured with 1-2 connection locations (safe and signaling).

Experimental materials: tap water or polyethylene glycol, outer equipment: spectrophotic meter

Technical Parameters:

1. Pre -filter: 20 -inch 5 μm coarse filters, 2.

2. The reverse osmosis membrane component adopts a 4040 membrane, the diameter of the membrane: φ100mm; length: 1014mm; dehydration rate: 95%; ** pressure: 3.16MPa. Use st--nless steel pressure vessels.

3. Ultrafilled membrane components: Polyetry fiber in polypropylene, pore diameter: 0.01-0.3 μm, pore rate: 50%-55%, interception molecular weight: 50,000, use temperature: 44 ℃ -73 ℃; ** Work pressure: 4KG /cm2, the output of the water is 60-600L/h.

4. Najie filter membrane components use 4040 membrane, st--nless steel shell, water inlet pH value 3.0-10, and ** water inlet temperature 45-80 ° C. Use st--nless steel pressure vessels.

5. Microfil film component: block-shaped charcoal + engineering plastic shell, water output is 250-2500L/h, and the pore diameter is 0.2 μm.

6. Measurement of the conductivity instrument: The concentration of the concentration of the inverse osmosis membrane, the export of freshwater, the export of thick water, the concentration of water inlet, export fresh water, and export thick water. A total of 6 online conductors, a range of 0-1999 μs/cm.

7. Microfilination of water flow: tube flowmeter, measurement range of 60-600L/h.