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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.

Slide Switches

The Slide Switches is used to switch the circuit by turning the switch handle to turn the circuit on or off. It is different from our other serious switches, for example, Metal Switches , Automotive Switches, Led Light Switches, Push Button Switches, Micro Switches, The commonly used varieties of Miniature Slide Switches are single pole double position, single pole three position, double pole double position and bipolar three position. It is generally used for low voltage circuits, featuring flexible slider action, stable and reliable performance. Mainly used in a wide range of instruments, fax machines, audio equipment, medical equipment, beauty equipment, and other electronic products.

The Mini Slide Switches are divided into: low-current slide switches (right), and high-current slide switches (left). Small current slide switches are commonly used in electronic toys, digital communications. High current is generally used in electrical appliances, machinery, etc.

It can divided into 4 types modals, respectively are:

1. High-current sealed switch

Its rated current is as high as 5A, and it is sealed with epoxy resin. It is a large current sealed switch. It has a variety of terminal forms, contact materials are silver, gold, switching functions. Therefore, there are many types of subdivisions. Widely used in electrical appliances and machinery

2. Single sided snap-on surface mount type slide switch

The actuator is operated on the side and the pins are patch-type, so it is a unilateral spring-back surface mount type slide switch. Widely used in communications, digital audio and video

3.4P3T in-line slide switch

The contact form is 4P3T and the pin is in-line. It is 4P3T in-line slide switch. 4P3T determines that it has 8 pairs of pins. At the same time, there are two pairs of brackets that support, fix, and ground. Widely used in building automation, electronic products

       4.Long actuator jacking type slide switch

Actuator 12mm, and located at the top of the switch, it is a long actuator jacking type slide switch. Widely used in digital audio and video, various instruments / instrumentation equipment

Slide Switches

Slide Switches,Micro Slide Switch,2 Position Slide Switch,Momentary Slide Switch

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