Function generator with frequency counter. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Function generator with frequency counter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Almost every radio amateur needs a generator and a frequency meter. On the pages of magazines, amateur radio designs on this topic were described. The proposed device is a "synthesis" of two designs [1, 2] with some modifications. This article does not provide a detailed description of the operation of circuits from primary sources, since they are completely finished designs and the authors describe in detail their work and setup methodology.

Function generator with frequency counter
Ris.1

Details: DD1 K561LA7; VT1 KT815; VD1-VD8 - KD522; VD9 D813; R1 8,2 k; R2 13 k; R3 33 k (hour); R4 3,3 k; R5 10; R6 100; R7 10 k; R8 150; R9 10 k; R10 3 k; R11 1,5 k; R12 750; R13 470; R14 470; R15 470 k; R16 470 k; R17 470 k; R18 24 k; R19 1,2M; R20 10; R21 360; R22 240; R23 3,3 k (level); C1 910; C2 0,01 uF; C3 0,1 uF; C4 1 uF; C5 10uF; C6 1500; C7 470x16 V; C8 47x16V; C9 47x16 V; C10 0,1uF; C11 1500; C12 47x25 V; C13 100; C14 510; SA1 "Range."; SA2 "Function".

The function generator (Fig. 1) generates rectangular, triangular and sinusoidal waveforms. In addition, it also generates white noise and square wave TTL and CMOS levels.

The main parameters of the generator:

Frequency range ............................... 1...100000 (1000000) Hz
Number of subbands .................................. 5 (6)
Output signal amplitude:
rectangular ....................................... 10 V
triangular ........................................ 6,3 V
sinusoidal ....................................... 3,3 V
"white" noise ........................................ 5 V
Rise and fall times of rectangular pulses ... 0,2 µs
Harmonic coefficient in the AF range no more than .......... 0,3%
Output impedance at CMOS output .................... 600 ohms

In the author's version, the device has five subranges of frequency control. If necessary, you can add a sixth subrange (capacitor C14). Frequency adjustment within the subrange is smooth, carried out by resistor R3.

Function generator with frequency counter
Ris.2

Details: DD1 K176IE5; DD2 K561LE5; DD3-DD8 - K176IE2. DD9-DD14 - K176ID2; DA1 K544UD2; VD1-VD2 KD512A; R1 1,6 k; R2 1,2 M; R3 15 k; R4 15 k; R5 15 k; R6 15 k; R7 150; R8 10M; R9 240 k; R10 15k, R11 15k, R12 8,2k; R13 15 k, R14 150; C1 0,22 uF; C2 0,22 uF; C3 50x16V; C4 100x16V, C5 100x16V, C6 27; C7 8.30; C8 2200, C9 1000; HG1-HG6 - AL304A; SA1 "Change / Check"; ZQ1 32768 Hz.

The frequency meter (Fig. 2) is made on microcircuits, has a self-control function, and a digital indication.

The main parameters of the frequency meter:

Measured frequency limits ....... 5...100000 (1000000) Hz
Sensitivity not worse than ......... 120 mV
Input impedance not less than ... 1 MΩ
Number of indicator digits ........ 5 (6)
Update rate ..... 1 Hz

In the author's version, the device has five digits of the indicator. In this design, the sixth digit of the indicator is added and the sound control of the measured frequency is excluded (R13, DD2.2, HA1 [2]). The device is powered by a power supply unit of the "step" type, assembled on integrated stabilizers according to the classical scheme (Fig. 3).

Function generator with frequency counter
Ris.3

If it is necessary to measure a higher frequency, the device can be supplemented with a simple frequency divider (Fig. 4), assembled on TTLSH microcircuits [3, 4]. For the manufacture of this design, a Polish-made plastic case of the Z1 type was used.

Function generator with frequency counter
Ris.4

Details of the functional generator and frequency meter correspond to the author's description [1, 2]. The power supply uses a transformer T1 with a power of 15 ... 20 W (see Fig. 3), the voltage of the secondary winding is 27 ... 30 V at a current of up to 0,6 A (in the case of using a frequency divider). Diode bridge VD12-VD15 small-sized imported production for a current of 1,5 ... 2 A. Electrolytic capacitors imported. Switches SA1-SA3 small-sized type PG2-1-6 P1NT or similar imported. Imported "tulip" sockets were used as output sockets.

Stabilizers 7812, 7809 can be replaced by KREN12B, KREN12A, respectively. Stabilizers must be installed on radiators, especially 7824. K155 series microcircuits can be used in a frequency divider, but the current consumption will increase significantly. Adjustment of the generator and frequency meter circuits is described in detail in the author's versions [1, 2]. A correctly assembled power supply does not require adjustment. Adjustment of the frequency divider is carried out using a reference generator and a frequency meter, checking the frequency division factors. An oscilloscope looks at the output pulses of the frequency divider.

Literature

Ladyka A. A simple function generator//Radio. - 1992. - No. 6.
Tokarev Ya. Portable frequency counter//Radio. - 1996.-№10.
Shilo V.L. Popular digital circuits. - M.: Radio and communication, 1988.
Degtyar O. Digital frequency counter//Radio amateur. - 2000. - No. 4.

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