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Electronic enthusiasts often need to make printed circuit boards. For many years, I have been using wallpapers to test circuit boards. It is very tiring and time consuming. Until last year, the school bought a DM2100 plate-making machine and really felt the convenience of computer graphics.
Use Protel99 to draw the printed circuit board diagram in advance, and draw a perspective when drawing. The toner is applied to the smooth side of the paper by a laser printer during printing. When transferring, first preheat the machine to about 130 °C, and print the printed surface of the PCB with the lined surface and the copper foil of the copper plate, and put the transfer machine back and forth twice. As long as the toner has been transferred to the board, it is fine. Start experimenting several times at the beginning.
At that time, the author ordered a few packs of thermal transfer paper by mail. Each pack of 100 sheets was sent to the students for the experiment board. As a result, the students used their opinions afterwards, and they could not reach the self-adhesive back paper that I came from the lettering shop. The effect, I personally experiment is also good time and bad. Looking at the transfer paper from these mail orders can not be used to really use a headache. Had to ask students to go to the lettering shop to come to the self-adhesive back paper transfer circuit plate map. In fact, it is very good to replace the transfer paper with a backing paper of self-adhesive paper. And there is almost no cost.
After many dismantling studies, in fact, such a plate-making machine is improved by an ordinary sealing machine (that is, a common laminating machine in a photo studio), but the frequency conversion speed adjustment is added. That is, the rotation speed of the rubber roller is lowered and heated. The temperature of the tube is controlled by a single-chip microcomputer, which is a voltage-regulating circuit of a thyristor. I borrowed a laminating machine from a friend and tried it a few times. I adjusted the temperature to the highest level. I had to do a printing plate for 3 to 4 times. The effect was similar to that of the DM2100 platesetter. Therefore, I used a plastic transfer board. It is actually feasible.
The board corrosion machine is a plastic anti-corrosion pump in a plastic rice bucket, but the price is not cheap. We spent 40 yuan in the flower and bird market to buy a 220v water pump with anti-corrosion ceramic core for the fish tank. Then we bought a square plastic rice bucket of the right size from the supermarket. The students started to do a corrosion machine by themselves, and the effect turned out to be very good.
If you do not have a laser printer, you can also use a copier. During the transfer process, the fixing temperature of various copiers seems to be different. The same paper works differently on different copiers. Some copiers actually baked that layer of plastic film.
Here is a simple and simple transfer method for amateurs to make printed circuits: use a thermostat type 500w electric iron. Adjust the temperature to the highest, put a soft cloth on the flat surface, fix the copper plate and transfer paper. In advance, find a blank place on the circuit board to apply a piece of transparent plastic, take the electric iron repeatedly to transfer the transfer paper back and forth, usually 2 to 3 times, until the smell of the transparent glue is heard, indicating that the temperature is enough, after the cold Uncover the transfer paper.
The AS-I (i.e. actuator-sensor interface) bus belongs to the bus system at the bottom device level. It is a two-wire network for digital input and output, which complies with EN50295 and IEC62026-2 specifications.
Various types of digital devices can be connected, such as: Sensors, limit switches, buttons, valves, relays, light curtains and emergency stop switches, etc., and send signals to higher-level controls such as PC, PLC, CNC or DCS system. In general, AS-I does not require shielded cables and terminal resistors.
The unshielded two-wire cable used carries both the signal and the power. Generally speaking, the AS-I bus system is simple and reliable, easy to install and fast to configure, and is widely used in industrial automation fields such as logistics, automobile production, petrochemical industry, and elevator control.
The As-I Passive Distributor simple module is pierced and connected to the flat cable, which is suitable for installation in a narrow space, and can provide connection methods such as aviation connectors.
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Kunshan SVL Electric Co.,Ltd , https://www.svlelectric.com