The simplest signal generator on a single zener diode. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Measuring technology

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The device can be used as a simple signal generator for setting up various amplifying and receiving radio equipment.

The signal generator is assembled on a D810 zener diode (D808 or D814A-D814G are also suitable). The circuit diagram of the device is shown in Fig.1.

Ris.1

The entire frequency range of the generator 100 kHz-27 MHz is divided into five subranges: 100-300 kHz, 300 kHz-1 MHz, 1-3 MHz, 3-9 MHz, 9-27 MHz.

The maximum voltage at the output of the generator is a few millivolts. The generator operation mode is set by a variable resistor R1. Power is supplied from 12 V batteries or from a separate rectifier.

Coils L1 - L5, together with a variable capacitor C3, form oscillatory circuits that highlight the frequencies that can be obtained at the output of the generator.

The generator coils are wound on frames with a diameter of 7,5 mm with tuned SCR-1 cores (used in TV IF amplifiers). The winding data of the coils are given in Table 1.

Table 1

Coils L1-L3 are wound in bulk, the winding width is 7 mm; coils L4 and L5 - in one layer, turn to turn. The variable capacitor can be of any type.

Set up the generator with the power off. The output of the generator is connected to the output of the reference GSS, and a lamp voltmeter is connected in parallel to the circuit. Based on the maximum voltmeter reading, which will correspond to the resonant frequency of the circuit, the required sub-range boundaries are selected and the generator scale is calibrated. The contours of other subranges are configured similarly. The principle of tuning receivers using the described generator is the same as with the GSS. When tuning the circuits to certain frequencies, the signal is supplied from the “Output 1” terminal of the generator, and when pairing the circuits, from the “Output 2” terminal.

Publication: N. Bolshakov, rf.atnn.ru

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