Monolithic quartz filter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Knots of amateur radio equipment. Quartz filters
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In the section "Abroad" ("Radio", 1969, No. 11, p. 58), a note "Monolithic quartz filters" was placed. Such a filter can be made at home from low-frequency quartz.
Quartz with rectangular, somewhat elongated plates coated with silver on both sides is suitable for making a filter. The areas that form the filter electrodes should be painted over with some quick-drying varnish and after drying by etching in ferric chloride (it should be clean, not previously used for etching copper), remove excess silver from the middle area. The etching process lasts from a few seconds to several minutes - depending on the thickness of the silver layer deposited
on a quartz plate. After etching, the plate is washed in running water, the varnish is removed with a solvent, and the resonator is wiped with alcohol.
To connect the filter, electrodes are made from thin sheet brass (Fig. 1).
A filter made of quartz with a frequency of 1312,5 kHz (Fig. 2) made in this way had a resonant frequency of 1325 kHz and a band of 3,5-4 kHz.
The filter was turned on according to the scheme shown in fig. 3.
Author: B. Karpov (RI8AAD), Tashkent; Publication: N. Bolshakov, rf.atnn.ru
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