xi9FYSmpL

Pure digital circuit clocks and alarm clocks

Overview

This is a purely digital clock and alarm clock,

both using CD4000 series CMOS chips
with a common cathode. The 0.56-inch digital display
uses a 32768Hz crystal oscillator and frequency divider to form an oscillation circuit
, allowing for time calibration, pausing the seconds, setting the alarm time, and turning the alarm off.
The operating voltage is 5V; do not exceed this voltage.
There is no reverse connection protection; reverse connection will burn out the circuit.
The PCB size is 10*10mm, and it meets the free opportunity requirement with
16 0603 surface-mount pull-down resistors

. The PCB traces are loose; only each component is connected.
This has been verified.

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2026-03-27 02:12:41

Contact us if you have Volkswagen series rearview mirror LED module
Volkswagen series rearview mirror LED module, if you have the ability to produce, please contact us, pictures are attached, QQ: 164455530
About X-type phase shift circuit
The circuit is as shown. The input signal is required to be 1MHZ peak-to-peak 2V. When I designed the phase shift to be 45 degrees, I took the capacitor C to be 1nf, and the resistor was calculated to
Our teacher asked us to make the 51 minimum system PCB + schematic diagram last semester.
Minimal system.
TIM5-TIM8 of STM32F103ZET6 does not work (newbie help)
TIM5-TIM8 of STM32F103ZET6 does not work, but TIM1-TIM4 works fine. TIM2-TIM5 is a general-purpose timer, but TIM5 has the same configuration as TIM2\3\4, but it does not work. The same problem occurs
Problems with three-level and two-level SVPWM
Are the software of three-level and two-level SVPWM inverters or frequency converters different only in the SVPWM wave generating part, and other parts can be used in common?
The project imported into Motorware fails to compile. Could you please tell me how to solve it?
The project imported into motorware fails to compile. Can you tell me how to solve it? Environment ccs6.1.2If the chip model is not specified by default, it can be compiled, but it cannot be debugged.

Datasheet More

Circuits More