Inductors L1 and L2 have a pot-core of ferrite Б26 brand М2000НМ and contain 110 turns of wire PEV-2 0,31. They can be replaced with circular ferrite rods М400НН Ø 8 mm, length 25 mm. the Transformer T1 is made on the yoke Ш20Х25. The winding of I contains 2500 turns of wire sew-2 0,23, winding II has 295 turns of PEV-2 of 0.67.
Д242 diodes can be replaced by КД202А, КД202В, КД202Д, КД202Ж, КД202М, КД202Р or Д242Б. КУ202Е is possible to use thyristors КУ202И, КУ202Л or КУ202Н. Transistor МП114 permissible to replace MP 115, КТ203А or КТ203Б and КТ315В — КТ315А, КТ315Г, КТ315Д.
For the heater cut out from a sheet of copper with a thickness 0.4—0.8 mm of the two shapes in figure 2 and solder the resistors between OMLT-2. Then to the two conductive plates to connect the two wire mgshv 0.75 mm length 1.5—2 m for connecting the heater to the thermostat.
Fig. 4. Design of a controller:
1 — upper front, 2 — screw M5 X 25, 3 — lamp receptacle, 4 — housing, 5 — circuit Board, 6 — nut M5, 7 — nut M6, 8— lower 9 — screw M3.
Fig. 5. Strut:
Next curly copper strips with the resistors Flex the shape of the nose, wrap three layers of fiberglass cloth and panel. To the corners of the heater, attach a ribbon or rubber tape width 10 — 30 mm for fixation of the heater face.
On the front panel of the thermostat, made of transparent Plexiglas mounted socket for connection of the heater displays the temperature control knob (R9) and drilled the window under the lamp H1. Inscriptions in ink on the sheet of paper which is fixed on the back side of the front panel.
Installation of the electronic unit is made on a printed circuit Board made from glass fiber plastic with thickness of 1.5 mm (Fig. 3).
The thermostat is assembled in a plastic case with internal dimensions 187X82X52 mm (Fig. 4). Printed circuit Board is secured using M3 studs and struts (Fig. 5).
Use electronograms very simple. The thermostat included in the network it is connected to the heater and fix it to the nose area. Rotating the knob “Temperature”, choose the desired degree of heating. However, before you start to use made electronograms, be sure to consult your doctor.
A. RUBANOV, Stavropol
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