Combined generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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To establish and repair electronic equipment, low and high frequency generators are needed. A simple device, the scheme of which is offered by the English magazine "Radio Electronics Constructor", will replace them at first.
The unijunction transistor V1 acts as a relaxer. The values of resistor R1 and capacitor C1 determine the value of the audio frequency (about 1 kHz). It is changed by selecting the capacity C1. Through the coupling capacitor C3, the low-frequency signal is fed to the output jack. And since it has a sawtooth shape, it contains a large number of higher harmonics.
To isolate the intermediate frequency of 460-470 kHz, a typical low-frequency transformer from a transistor radio receiver is included in the base circuit 1. The required frequency is selected with a forrite core.
The generator uses a unijunction transistor KT117.
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