Rev:Nobember 20. 2006
11
So far the theory of this
new IF Amplifier design,
let´s start to asemble it
now.
Start in the lower right
corner in D5
[ ] C11 150pF (151)
D-5
[ ] R8 270R upright
D-5
[ ] R9 1K upright
C/D-5
[ ] C16 39pF (390 or 39)
C-5
[ ] C17 47nF (473) C-5
[ ] C14 47nF (473) C-4/5
[ ] Dr4 33
u
H SMCC C-5 see picture right!!
[ ] R10 2k2K upright C-5
[ ] Dr3 100
u
H SMCC C-5
[ ] R11 12K upright C-5
[ ] R12 3,9K upright C-5
[ ] C15 47nF (473) C-5
[ ] C25 47nF (473) B/C-5
[ ] C19 150pF (151) B-5
[ ] R13 3k3 B-5
[ ] R14 270 R upright B/C-5
[ ] C26 0,47
u
F 35V Tantalum C-4/5
[ ] R15 470K B/C-4
Remember ESD rules while installing the following transistors, they are very
sensitive against electrostatic discharge.
Attention:
The suffix in a type is essential, it makes the difference. Never
interchange BF244
B
and BF244
A,
they are really different. This rule is true
for all European BF, BC, BD type transistors.
[ ]
T4
BF199
C-5
[ ]
T3
BF244A
C-5
[ ]
T6
BC550C
B/C-4/5
In the next step you will find the first coil. Because all over the world Radio
Amateurs are telling sad stories how difficult it is to make such coils, i will
describe the „how to make coils „ a little bit broader to show you, that
there is nothing secret nor complicated.
In american kits torroids are preferred. In Germany for long times only
cylindrical and shielded cylindrical coils have been used. Both types have
advantages and disadvantages and that´s the reason that in our designs we
use both types. The main advantage of a Coil you will use in this section is
its low footprint. Compared to a torroid it is allmost a halfe place you need
because it must be tuneable and Torroids can only be tuned if you use an
extra variable cap. In our BCR we use a special type of encapsuled variable
Coils. They are named „Bobin“ coil. The body to put the wire on is made
out of ferrite, you see it in the picture at number 4. We wind the wire on
this form not as a single layer but just „as it comes“ The only essential is,
that the number of turns must be correct. The complete Bobin consists of:
1. Shield cap
2. Holder for the ferrite cap made from plastic,
3. Ferrit cap with an outside thread 4. Bobin Body,
5 socket with 5 Pins.
Содержание Blue Cool Radio
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