VIEWS of BOARD and BASE PLATE
Short description of printed circuit board
It's mainly a multipurpose analog printed circuit board, small power analog servocontroller oriented, allowing to any amateur, by addition of components, to realize simple and low cost analog servocontrol. At the input, a linear device like Hall sensor or an optical sensor reading an adequat target or a potentiometer linked to the mechanism which one wants to bring under control. At output this pcb can support: field coils (combined: 50 ohms min.), or small reversible low voltage DC motor (200 mA max., internal resistance 80 ohms min.), or polarized relays, or polarized solenoids (magnetically) allowing the displacement of a device relating to the position of a sensor, servo-mechanism /null-effort or an angular positioning according to a request, etc).
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, one places components there or not, one installs/removes the jumpers or even the IC's if one took the precaution to assemble them on sockets. Trimpots and connecting points at "strategic" places also make it possible to fit the circuit to specific applications.
Finally this board, by a judicious use of the tracks, sites 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. The sizes of this pcb are 4,2"x4,0" (106x102 mm). From a 15VCA source we found on the board:
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, one places components there or not, one installs/removes the jumpers or even the IC's if one took the precaution to assemble them on sockets. Trimpots and connecting points at "strategic" places also make it possible to fit the circuit to specific applications.
- power supply ±12V, ±5V in flyingmagnet case,
- one voltage reference +2.5V (LM336-Z2.5) stabilized or not in temperature,
- three DIP14 of 4 OP amplifiers and one DIP8 of 2 OP amplifiers (foot-print like TL074 and TL072),
- two bridge output combining OP amplifiers and transistors (4 TO220), unsuitable in this form with the audio,
- two band pass filters with input & output isolable by means of jumpers and one low-pass filter.These circuits can be wired to fulfill other functions,
- three OP amplifiers packages are supplied in ±5V, the two others in ±12V,
- a LM555 in oscillator with independent output and control frequency trimpot, etc.
Notes:
1. Power supply adaptation can be done according to needs (heatsinks, regulators, sources, etc). In the levitation application the power supply knowingly limited to very weak performances, the heatsinks are minimal, but assisted by the thermal bridge existing between regulators case and the frame through brass spacers. (energy spent in stable mode is negligible), the board is fed by a 15 VCA-800 mA wall plug-in adapter
1. Power supply adaptation can be done according to needs (heatsinks, regulators, sources, etc). In the levitation application the power supply knowingly limited to very weak performances, the heatsinks are minimal, but assisted by the thermal bridge existing between regulators case and the frame through brass spacers. (energy spent in stable mode is negligible), the board is fed by a 15 VCA-800 mA wall plug-in adapter
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, it, 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 power function. 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 simple boards permits applications otherwise impossible due to the modest power or for multi-sensors application. |
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Views of the multipurpose board wired for control of stability in levitation in "opto" mode
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 (criteria #6 fully respected, see the first alternative picture at top/left corner in photos page) .
Note: the reflective sensor can be replaced by Hall sensor (criteria #6 fully respected, see the first alternative picture at top/left corner in photos page) .
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