Velleman-Kit K7200 Mode D'emploi page 28

- Fold the connections of the transistors in an angle of about 45 degrees.
- Apply a thermal conduction paste on one side of the mica insulators and place
them over the bolts in such a way that they stick on to the heatsink.
- Apply a little thermal conduction paste on the transistors and place them in turn
over the fastening bolts.
- Fix the transistors first via an insulating ring, a washer and a lock washer and
finally a M3 nut. (see figure 3.3)
- Solder the transistor connections on to the boardpins for T4, T5 and T6 of one
board and T7 and T8 of the other board.
Assembling the rectifying bridge: (for positioning see figure 3.1)
- Slide a hexagonal bolt in the fastening slot of the left heatsink. (see figure 3.4)
- Apply a little silicon or thermal conduction paste (obtainable at specialist shops)
on to the back plate of the rectifying bridge and fix the latter on to the heatsink by
means of lock washer and M3 nut (see figure 3.5). Make sure that the clamp
marked + is situated on top. (see figure 3.1)
Assembling small power supply transformer for digital readout:
- Mount the 2X6V transformer on the bottom plate by means of 10mm M3 bolts,
lock washer and nut. (see figure 4.0)
Assembling and connecting the smoothing elcos C11 and C12 of 4700uF:
(figure 4.0)
- Mount the elcos in their bows with the connections facing upwards and fix
these on to the bottom plate by means of a 10mm M3 bolt, lock washer and nut
(see figure 4.0)
- Connect with a piece of additionally supplied red wire, by means of a cable
shoe (that which is soldered the best), the + clamp of the rectifier with clamp
1(+)of a capacitor and interconnect this with clamp 1(+) of the other capacitor.
(figure 4.1)
- Connect in a similar fashion clamp 5(-) of the elcos with the negative clamp of
the rectifier by means of a piece of blue wire (i.e. the clamp diagonally over the +
clamp).
Assembling the front panel:
- Mount on the front plate the four zinc-plated M3 bolts of 45mm together with
the 10mm threaded bush. Fix these firmly, because you will not be able to reach
them after the front foil has been adhered.
Adhering the foil on to the front panel:
- Check beforehand whether the front panel is free of dust or burrs (it is safe to
degrease with alcohol first).
- Position the foil on the front panel in such a way that the openings coincide.
- For the time being adhere the foil on one side by means of adhesive tape.
- Remove on the other side the protective film and adhere this side on to the
H7200-ED2-28