Version: 13. September 2004
13
When no plus is found, the positive terminal is marked by a dash. The
longer lead allways shows the positive terminal. Tantalum capacitors are
often used, when low leak currents are needed at high capacities.
[ ]C128 6,8µF 16V Tantalum pearl B5
Now follows an integrated circuit. TAKE CARE. The device is static
sensitive. Before handling it, you must discharge your hand to
ground. The soldering iron MUST be potential free, the best
thing is a potential levelled soldering station.
Due to production circumstances, ICs have their leads spread a little wider
than the standard raster. By careful rolling, the leads are brought to their
proper position. Pin 1 is marked on the top of the IC,
either by a notch or by a dot. The notch is marked in the
placement diagram. Mount the IC as shown, and begin
by soldering two diagonal leads. Check that the IC is
flush to the pc board, and corect it, befor soldering the
rest of the leads.
[ ]IC13 4093 DIL 14 A/B6
The following transistors are all in TO92 casings as the voltage regulators of
section 1. Check the marking with a loupe, to avoid mixing them
up. The mounting direction is shown in the placement diagram.
For the MOSFETs remember to discharge your hands before
handling them!
[ ]T24 BS170 MOS take care of statics A6
[ ]T26 BS170 MOS take care of statics B5
[ ]T25 BC546B B5
[ ]T27 BS250 MOS take care of statics E1/2
[ ]T28 IRF9520 take care of statics E1
Note the mounting direction with the following diode.
[ ]D31 1N4148 A5
The resistors should pose no problem.
[ ]R104 10K A6
[ ]R105 39K B6
[ ]R103 220R A5
[ ]R107 8,2K A5
[ ]R109 33K A/B5
[ ]R108 39R B5
[ ]R106 22K B5
[ ]R110 56K E1/2
[ ]R111 56K D/E1
Now follows the pins for connecting the peripheral parts.
[ ]PIN 9 A/B6
[ ]PIN10 A5
[ ]PIN11 A5
[ ]PIN13 B5
[ ]PIN39 E2
[ ]PIN40 E1
[ ]PIN41 E1/2
[ ]PIN42 E1/2
[ ]PIN53 A/B5
To test this section the connection between pins 47 and 18 of section 1 is
needed again. And also pin 9 should be connected to +10 Volts. A short is
need between pin 11 and pin 41, and one from pin 10 to pin 42.
Test Section 2
1. Visual inspection (see Section 1)
2. Resistance test (see Section 1)
[ ] Apply supply voltage as in Section 1 test.
current should be abt 20mA
3. Smoke test (see Section 1)
4. Functional test
When pin 53 is grounded,
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