Signal generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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This generator is very simple and, with the right parts, it can be mounted in a matter of minutes. According to the scheme (see figure), it is an asymmetric multivibrator made on transistors of different structures: npn (VT1) and pnp (VT2). The generator is loaded on high-resistance headphones BF1 of the type TON-1, TON-2. It is turned on by the SB1 pushbutton switch - it can be, for example, a telegraph key. In this version, the generator will help to study the telegraph alphabet: "dots" will correspond to a short press on the key handle, and "dash" - a longer one.
If there is no telegraph key, its role will be played by a regular bell button.
The second application of the generator is the "ringing" of the installation. Insert the conductors with probes at the ends into the sockets of the X2 socket. You will touch the tested circuits with the probes. If there is a connection, there will be a sound in the headphones, if the circuit is broken, there will be no sound.
In place of VT1, you can install any transistor from the MP35-MP38 series, and in place of VT2 - any of the MP39-MP42 series.
The generator is operational when the voltage of the GB1 battery drops to 3 V. If desired, the tone of the sound can be easily changed by selecting a resistor R1 or a capacitor C1.
Author: S.Belov
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