Re: Crystal Radio Tuning Capacitor
- From: ehsjr <ehsjr@xxxxxxxxxxxxxxxx>
- Date: Thu, 13 Dec 2007 06:08:45 GMT
Dave.H wrote:
I'm planning to build a crystal radio similar to the one linked to at
the bottom of this post, but the specs call for a 30-160 pf tuning
capacitor, all I can find is a 60-160 pf cap. Will this still work?
Yes, with a narrower tuning range. But you can add
switched fixed value capacitors to extend the range,
if you want. This is a kludgy arrangement, but will
get you the full tuning range:
S1 S2
--------+-----o o---+---o o---+
| \ | \ |
[C1] [C2] [C3]
| | |
--------+------------+----------+
Values:
C1 60-160 pf variable
C2 56 pf fixed
C3 30 pf fixed
Range(pf) S1 S2
29-41 Closed Open
36-68 Closed Closed
60-160 Open Open
The site you posted sells a variable cap for use in
their radios - that may be a better choice than
using the switch capacitor kludge.
Ed
.
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