Page
3
of
8
efhw_tuner_assy_090110.pdf
Next, refer to the sketch below and install the following components on the
“BACK”
side of the board.
Do not elevate the components.
[ ]
Install C2, .1uF, marked 104
[ ]
Install D2, 1N4148 signal diode, observing the black polarity band (cathode) location as shown
above.
[ ]
Install R4, 470 ohm resistor (yellow-violet-brown-gold)
[ ]
Install R1 – R3, 51 ohm, 2W, power resistor
Next to assemble are the two toroids on the
“BACK”
side of the board.
[ ]
For L1, use the T50-6 (yellow) core and 24” of the supplied magnet wire. You are winding a total
of
23
turns, with a tap at
3
turns from the beginning of winding. The picture, and figure below
shows the beginning of winding and the twisted technique for the tap.
Note:
Now is a good time to mention a good way for counting the turns on your toroids. Many times on
toroids with a lot of turns, you lose track going around, as some are quite small. A good trick is to take a
digital picture of it and blow it up on your computer screen. Counting is clearly a lot easier.
