Digital Clock circuit with CMOS 4047

This circuit provides a digital square wave that can be viewed directly or used to drive other circuits. It used the CMOS 4047 Low-Power Monostable/Astable Multivibrator. As used in Tom Duncan's Adventures with Digital Electronics Book, to drive CMOS Decade of 4-bit binary counters. More: RC = 10M x 100nF = (10x106) x (100x10-9) = 1 Hz OscOut (Double Frequency of Q) Q (Inverse of Q) Q (Square Wave, Frequency RC Hz, 1:1 Mark:Space Ratio) These 3 outputs can be viewed using an LED and 330R Resistor in series. 4047 Low-power astable/monostable multivibrator with oscillator output.

The described circuit utilizes the CMOS 4047, a versatile low-power monostable and astable multivibrator, to generate a digital square wave signal. This square wave can be employed for various applications, including driving other digital circuits or visual indicators like LEDs.

In the astable mode of operation, the 4047 generates a continuous square wave output. The frequency of this output is determined by the resistor-capacitor (RC) time constant, where the resistor (R) is set to 10 MΩ and the capacitor (C) is set to 100 nF. The calculated frequency of the square wave output is approximately 1 Hz, as derived from the formula \( f = \frac{1}{2 \cdot R \cdot C} \). This frequency corresponds to a duty cycle of 50%, resulting in a 1:1 mark-to-space ratio in the output waveform.

The 4047 provides multiple outputs: the primary output (Q), its inverse (notated as Q'), and an oscillator output (OscOut), which operates at double the frequency of the Q output. The Q output represents the square wave signal, while Q' provides the inverted square wave. The OscOut serves as a higher frequency alternative, suitable for applications requiring a faster signal.

To visualize the outputs, an LED can be connected in series with a 330 Ω resistor. This arrangement allows for direct observation of the square wave signal, with the LED turning on and off in accordance with the output frequency. The resistor is essential to limit the current flowing through the LED, protecting it from excess current that could lead to damage.

Overall, the CMOS 4047 multivibrator circuit is a practical solution for generating square wave signals, applicable in various electronic projects and systems requiring timing or waveform generation.This circuit provides a digital square wave that can be viewed directly or used to drive other circuits. It used the CMOS 4047 Low-Power Monostable/Astable Multivibrator. As used in Tom Duncan's Adventures with Digital Electronic's Book, to drive CMOS Decade of 4-bit binary counters.

RC = 10M x 100nF = (10x106) x (100x10-9) = 1 Hz OscOut (Double Frequency of Q) _ Q (Inverse of Q) Q (Square Wave, Frequency RC Hz, 1:1 Mark:Space Ratio) These 3 outputs can be viewed using an LED and 330R Resitor in series. 4047 Low-power astable/monostable multivibrator with oscillator output. 🔗 External reference