Instead of a toggle switch - a relay, instead of a KPI

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Instead of a toggle switch - a relay, instead of a KPI - a resistor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment

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When designing small-sized equipment, the question often arises of how to place all the controls on the front panel, while simultaneously satisfying the requirement of locating, for example, toggle switches near the corresponding cascades.

In such cases, a small-sized variable resistor, transistor and relay can be successfully used (Fig. 1). This replacement is often more convenient than a toggle switch, since it makes it possible to locate the relay in close proximity to switched circuits, which can be high-frequency, and, therefore, significantly reduce the likelihood of self-excitation and increase the stability of the entire device as a whole. It is desirable to use the relay with a low current consumption, such as RES49, RES60, although the resistor makes it possible, after the relay is triggered, to reduce its current to the required value to hold the contacts, which can be useful in self-powered equipment.

Instead of a toggle switch - a relay, instead of a KPI - a resistor
Ris.1

When designing QRP transceivers with quartz stabilization and with a conventional frequency drift scheme (Fig. 2)

Instead of a toggle switch - a relay, instead of a KPI - a resistor
Ris.2

Instead of C1, you can also use a variable resistor [1]. The values of C1, C2, R1 (Fig. 3) are selected for a specific quartz according to the maximum frequency shift. The circuit was tested in the ranges of 3,5 ... 14 MHz and provided almost the same frequency change as with KPI 10/100 pF (C1 in Fig. 2) with the same unevenness of the output signal amplitude.

Instead of a toggle switch - a relay, instead of a KPI - a resistor
Ris.3

Literature

1. G. Baghdasaryan. On tuning the frequency of LC-oscillators. Radio No. 7, 1994

Author: Igor Grigorov, RK3ZK, Belgorod; Publication: N. Bolshakov, rf.atnn.ru

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