60Hz time base signal generating circuit, 60Hz Timer Circuit
Keywords: clock signal generating circuit, CD4060 signal generator
Figure 1 circuit is a 60 Hz digital clock time base circuit composed of 12 is a binary serial counter / divider CD4040 and a six-inverter CD4069 or the like.
In the circuit, the gate I of the CD4069 and the door II constitute a crystal oscillator having a hoe frequency of 32768 Hz. It outputs the end of the CD4040 after the gate III plastic surgery is placed. The output of the CD4040 is set by the diode VD1 to VD3 to 21 + 25 + 29 = 546, and a 60 Hz clock signal is supplied to the digital clock integrated circuit after the output terminal Q9 is subjected to divide frequency.
Figure 2A is another 60 Hz pulse generating circuit. It consists of an element of the integrated circuit CD4060 and a resonant frequency of 30720 Hz. The CD4060 is a 14-bit binary serial count, a divider, and an oscillator. The CD4060 is divided into two parts, some of which is a 14-level count / divider, and the division coefficient is 16 to 16348; the other portion can be formed with an external resistance and a capacitor, and can constitute high precision with the external crystals. Crystal oscillator. This circuit uses an external 30720 Hz crystal to form a crystal oscillator, and the oscillating signal outputs an accurate 60 Hz frequency signal (30720 29 = 60 Hz) in the Q9 end after 9 times in the CD4060.
When the circuit is applied with a dual-havepass numerical clock, the polarity conversion can be performed using FIG. 2B circuit. VT1, VT2 is selected for NPN type three-pole, such as 9013, 8050, etc., the A terminal is connected to the power supply, and the B-terminal is connected to the power supply negative. When the circuit is applied to the double male digital clock, VT1, VT2 selects a PNP type triode, such as 9012, 8550, and the like, and the A terminal is connected to the negative power supply, and the B-terminal is connected to the power supply.
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3 is a 60 Hz pulse generating circuit composed of 60 Hz pulse generator-specific integrated circuit MM5369 (8 pin DIP package) and a resonant frequency of 3.579545. It is often used to provide 60 Hz frequencies with the digital clock. After the oscillation signal is separated by the internal division of the MM5369, the oscillating signal is output from 1 pin and the frequency is quite stable. This circuit is powered by 6 to 12V power supply. When the power supply voltage is lower than 6V, its reliability varies. In special cases, the resistance of R3 in the circuit can be changed to about 100 ohms, and the circuit can be lowered to 4.5V.
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The above two circuits apply to the entire machine circuit of the negative electrode, and is also suitable for use in a circuit system that is grounded, and is available in design.
Figure 4 is 60 Hz clock circuit composed of two CMOS integrated circuits, quartz crystals. Quartz crystals and CD4060 constitute an oscillation, a crossover portion, BG1, and CD4017 constitute a count, a dispensing portion. The square wave signal of 1024 Hz, 4Hz, and 1024 Hz input to the CD4017, the square feet, respectively, and 1024 Hz input to the CD4017, the signal, and the signals assigned to CD4017, "or door" signals are again entered. CD4017 15th foot is a reset signal. In the 1/4 cycle of the second foot of the CD4017, when the CD4017 is reset; the low level CD4017 receives 128 pulse signals, and the 9 pulse signal CD4017 is reset once, which is only assigned to the CD4017 2nd foot 15 pulse signals. A 60-pin 60 pulse signal is assigned to the CD4017 of the second pin in 1 second, thereby obtaining a practical clock 60Hz standard time base signal.
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The calibration of the quartz oscillation frequency, the available frequency gauge measured CD4060 No. 9 should be 32768 Hz, and if the variationable variable variable power capacitor is corrected.
Fig. 5 is a time-based signal generator having a 60 Hz composed of a CD4060. Relative to the first few is the most practical time base signal circuit.
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