Power supplies for microdrills. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Radio amateurs most often place their products on printed circuit boards or circuit boards. In their manufacture, it is necessary to drill a large number of holes of small diameter (0.8 ... 1.2 mm). To make this work not too tedious, special machines, micro-drills ("drills"), etc. are used.
This tool requires power. Of course, if you have a laboratory power supply (PSU) or a special one designed specifically for a microdrill, then there are no questions. And if not? So I also had a need to "drill", and the "drill" requires a constant voltage of 9 ... power supply. Of course, when a PC is running, no one will connect additional devices to its PSU, but it’s not a sin to borrow a PSU from a switched off one for a while.
No words, it's better to take a "live" PSU from an old computer, gathering dust somewhere on a shelf. You can power from it a lot of devices designed for a voltage of 5 ... 12 V. To extinguish excess voltage. if intermediate voltage values are required, it is enough to include a chain of series-connected diodes suitable for current in the load circuit (voltage drop on a silicon diode is 0,7 V, on a germanium diode is 0,3 V).
To power the microdrill, I used an ATX-230 computer power supply with output parameters; +3,3V/10A; +5V/20A; +12V/6A; -5V/0,5A and -12V/0,5A.
The location of the pins of the output connector of the PSU ATX-230 is shown in the figure.
(click to enlarge)
All sockets are connected to the power supply with multi-colored wires. The purpose of the contacts is given in the table. Since the "no load" mode of the pulse PSU is extreme, you should not "try your luck", and it is better to connect the microdrill to the PSU directly to the 12 V contacts (pin 10 - yellow wire) and common (pin 7 - black wire). The microdrill is turned on and off via a remote control circuit (RC) by connecting pin 14 (green wire) to pin 17 (black wire). Conclusions made with wires of the same color. are equivalent (interchangeable).
We turn on the power supply unit in the network with a regular cord, only auxiliary voltages appear at its output. We press the button SA1, mounted on the body of the microdrill (its engine starts), and drill. The PSU is connected to the microdrill with a three-wire cord (the common wire of the load and control circuits is the same). The control of the PSU operation is carried out at pin 8 (high logic level - all PSU voltages are normal).
Author: V.Besedin, UA9LAQ, Tyumen
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