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Hans Summers
开云体育?
I have now placed the bulk order for BITX20
components. I have emailed all those who asked for the components. If you
haven't heard from me then I have probably forgotten you in which case shout.
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Due to a further bulk price reduction on the
crystals, and that the price quoted on the telephone ended up less than in the
catalogue, they were just ?0.223 each. The 2N2219A were also cheaper because
more than 10 were ordered. So the overall price came down a little.
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I have ordered two extra complete sets in
case any newcomers want them, as listed below. The price is now ?8.19 for one of
these sets + postage at cost (?0.28 UK). I hope someone will want these sets
because otherwise I'll have them hanging around here doing nothing.
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I also ordered some extra 10MHz crystals and
can provide them at ?2.23 per set of ten, + postage at cost.
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One component set contains:
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Qty 10 of 10.000 MHz crystals, HC49 style
Qty 25 of BC547B transistors
2N2219A driver transistor
IRF510 MOSFET
Qty 15 of 1N4148 diodes
36V Zener diode
9.1V Zener diode
5.6V Zener diode
LM386N-1 Audio Amp IC (correct variety)
Qty 5 of 2-22pF trimmer capacitor
Miniature tuning capacitor*
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* NOTE: The tuning capacitor is one of the miniature kind as used in
portable radios. Size is 20.2 x 20.2 x 10.8mm. Control shaft is 6.6mm diameter
tapped with 2.6mm thread. Panel mounting is via twwo 2.6mm tapped screws next to
the control shaft. Capacitance: AM section 3.0 - 141.6pF, Oscillator section 4.0
- 59.2pF. So in parallel you'd have 200pF which is less than Farhan's design for
350pF. It might therefore be necessary to alter the VFO coil to get the required
tuning range.
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72/3 Hans G0UPL
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