Presettable Up-Down Counter Timer

When i had put the near Obsolete digital circuits online in the late nineties. One person who works in a public institution in the usa, wanted a modification of one of my existing circuits. He had those parts the CD40 Series Logic Chips. He wanted to use only those that he had in his Stock.

I made some modifications and sent it to him, that helped him with his task. These things can be done very easily using the Arduino. One could make a programmable Arduino Timer/Counter with a matching Configuring Software without coding, for such people. Easy and Affordable.

Digital Circuits 2 from delabs

Circuit 1 – Digital Timer Clock With Preset using Thumbwheel switch.

A Thumbwheel Switch has to be used in place of DIP switch shown, just know that 1-2-4-8 nibble (4 bit) should be generated by Thumbwheel switch at preset or jam inputs of 4029.

Use CD4511 if 4513 is not available, but circuit has to be changed a bit around 4511

Circuit 2 – 1 Hz or 1 pps crystal clock using CD4060 and 32768 Hz Crystal.

They have not been tested much… The 4513 control pins 8-4-5-3 connections verify, as i did not get the datasheet.

The circuits will work as the concepts are right, but some tweaks in R C values may be required.
the R C values can only be corrected if you have problem in making it work.

The main problem in the R C values may be related to “the reset at 6 for the tens of seconds and the tens of minutes”.

  • Monostable Multivibrator CD4538Monostable Multivibrator CD4538
    CD4538 is a dual Monostable Multivibrator. When you trigger the chip the output sends off one single pulse or one high-low event. Mixed Circuits Analog [...]
  • Constant Current Source for LEDConstant Current Source for LED
    This article will explain the way a simple transistor based current source is designed, this will give an idea on how some components can be [...]
  • AC conversion and Continuity – DMM
    U1A LF353 opamp turns on a buzzer when the voltage at Test + falls very low indicating a short between Test + and Test – [...]
  • Proportional Temperature Controller
    Proportional Temperature Controller This is a Proportional Controller where the setpoint is derived from a Thumbwheel switch. The conversion of Thumb-wheel Digital Data to Analog [...]
  • Battery Backup for SRAM or Microcontroller
    This circuit can be used as a low cost SRAM and Microcontroller-Microprocessor Battery Backup. All the diodes are 1N4148, The diodes prevent battery discharge back [...]
  • Multiplexed Presettable Timer with ICM7217Multiplexed Presettable Timer with ICM7217
    This was a attempt to make a Sequential Timer with ICM7217 of Intersil, even though it worked well, it was not developed beyond the prototype [...]
  • Crystal Oscillator – Parallel ResonantCrystal Oscillator – Parallel Resonant
    74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto [...]
  • 0-1V to 4-20 mA Converter0-1V to 4-20 mA Converter
    This two opamp circuit converts analog voltage signals to current (sink) signals in a proportional manner. Current signals are more immune to noise and cross [...]
About delabs 160 Articles
Product Design - Industrial Automation and Instrumentation. -