PCBs and BASE PLATE
Short description of printed circuit boards to achieve multiple experiments
They are mainly multi purpose PCBs, small power, analog servo controller oriented, mono channel or triple channels, allowing to any amateur, by addition of components, to realize simple and low cost analog servo control. At the input, a linear device like Hall sensor, optical sensor reading an adequate target or a variable resistance linked to the mechanism that we want to control. At the output, these pcb can drive on each channel: a 50 ohms combined loads (minimum DC resistance), like field coils, small reversible low voltage DC motors, polarized relays, polarized solenoids, allowing the displacement of a device in function to the position of a sensor relatively to his target, servo-mechanism /null-effort or an angular positioning system in according to a request and many other applications.).
By using an adequate geared motor, this modest power allows very relevant achievements on condition to keep in mind, the dilemma torque/speed and also the angular precision to be reached. Additional features are present in the circuit to solve several problems, specific to the controlled levitation of the flyingmagnet or in an analog servo control application, we place components there or not, we install/remove the jumpers or even the IC's if one took the precaution to use sockets. Trimpots and connecting points at "strategic" places also make it possible to fit the circuit to specific application.
Finally this board, by a judicious use of the tracks, locations and values of the components, becomes an analogical board nearly... universal making it possible to wire easily, a personal diagram based on operational amplifiers, with in bonus, a good appearance. From any low voltage source CA or CC; single or double, regulated or unregulated. We found on those boards:
1. Power supply adaptation can be done according to needs (heatsinks, regulators, sources, etc). In the levitation application the power supply can be limited to weak performances, the heatsinks are minimal, but assisted by the thermal bridge existing between regulators case and the frame through brass spacers. (the energy needed for stabilize the object in levitation is negligible), the board is fed by wall adapter (ac or dc, depending of the type of selected regulations).
2. Intermediate access points make it possible to connect two boards in master/slave mode, the master board is that which fulfills the function "sensor", the slave board reproduces the power function of the master board, phase reversed or not, according to the needs. Another configuration is possible concerning "two sensors" functions" towards one function "power". An additive board, specifically used in this mode is simplified and thus much cheaper in term of components and set-up time.
3. The addition of a simplified PCB allows the applications impossible otherwise, due to the modest power or for an applications requesting several sensors.By using an adequate geared motor, this modest power allows very relevant achievements on condition to keep in mind, the dilemma torque/speed and also the angular precision to be reached. Additional features are present in the circuit to solve several problems, specific to the controlled levitation of the flyingmagnet or in an analog servo control application, we place components there or not, we install/remove the jumpers or even the IC's if one took the precaution to use sockets. Trimpots and connecting points at "strategic" places also make it possible to fit the circuit to specific application.
Finally this board, by a judicious use of the tracks, locations and values of the components, becomes an analogical board nearly... universal making it possible to wire easily, a personal diagram based on operational amplifiers, with in bonus, a good appearance. From any low voltage source CA or CC; single or double, regulated or unregulated. We found on those boards:
- internal regulated power supplies (linear or switching) ±12V, ±5V;
- one or two voltage references +2.5V adjustable (LM336-Z2.5);
- one or three bridge output, combining opamp and transistors (14 DIP and TO-220), unsuitable in this form for audio application;
- bandpass filters with input & output isolable by means of jumpers;
- one oscillator (TLC555), with independent terminals output and adjustable frequency;
- etc.
1. Power supply adaptation can be done according to needs (heatsinks, regulators, sources, etc). In the levitation application the power supply can be limited to weak performances, the heatsinks are minimal, but assisted by the thermal bridge existing between regulators case and the frame through brass spacers. (the energy needed for stabilize the object in levitation is negligible), the board is fed by wall adapter (ac or dc, depending of the type of selected regulations).
2. Intermediate access points make it possible to connect two boards in master/slave mode, the master board is that which fulfills the function "sensor", the slave board reproduces the power function of the master board, phase reversed or not, according to the needs. Another configuration is possible concerning "two sensors" functions" towards one function "power". An additive board, specifically used in this mode is simplified and thus much cheaper in term of components and set-up time.
Others circuits :
- PCB base geometry #5, 6 coils, sizes: 5.91"x5.91" (150 mm x 150 mm).
- PCB base geometry #5, 3 coils, sizes: 5.91"x5.91" and less.
- Small PCB for easy interfacing with the differential mode (geometry #5, etc.).
- Small PCB for easy assembling of 3 Hall's sensors (geometry #5).
- Small PCB for easy implantation of the positioning and the guiding by induction
(no Hall or opto sensors), for geometries #5-6, #6, etc.
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Base plate of the flyingmagnet
The base plate consists of a 2mm thickness anodized aluminum frame and several angles 13x19, length according the drawings, a cutting makes it possible to receive the pcb and gives direct access to the adjustments. A simple but essential device allows the fine positioning of the optical sensor (or the Hall sensor). The whole asssembly can be inserted inside a standard enclosure Hammond #1599HSGY (photos & video). For clearness reasons, some practical details are omitted in the drawing below, such as angles mounted on each side for rigidify the base plate or other details in relation with the sensors assembling.
Note: the reflective sensor can be replaced by Hall sensor (criterion #6 fully respected), in this case the mechanical positionning device for sensor adjustment can be simplified, but the magnets located inside the "flyingmagnet" must be re-optimized (ask for details). We can see the first alternative pictures at top/left corner in "Photos" page and in the "Tech's" page.
Note: the reflective sensor can be replaced by Hall sensor (criterion #6 fully respected), in this case the mechanical positionning device for sensor adjustment can be simplified, but the magnets located inside the "flyingmagnet" must be re-optimized (ask for details). We can see the first alternative pictures at top/left corner in "Photos" page and in the "Tech's" page.
Base principle & prototype (geometry #1) more details [.pdf]
00036017
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