A Low RPM Alarm Using 74HC or 4000 Series Logic. No MCU allowed.

Stato: Closed
Premio: $100
Proposte ricevute: 13
Vincitore: osamaelkomy

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Descrizione del concorso

I need a simple circuit using common hardware parts that measures the high width of a TTL pulse and if it exceeds 3 seconds a logic output is set high as an alarm.

If the pulse becomes shorter than 3 seconds the logic output is set low so alarm is turned off.

A 32768Hz clock is available. Maybe a 74HC series binary counter might work. Or specify your own clock generator.

We want simple 74HC logic, or 4000 logic. Not MCU and not FPGA.

When we choose the circuit we will build it to confirm it works before awarding prize.

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Le migliori proposte per questo concorso

Muzafarbaloch Pakistan

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rajia85 Bangladesh

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Veershetty023 India

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ansardeo Pakistan

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Muzafarbaloch Pakistan

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abilash06 India

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cnarvaez1957 Venezuela

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BhautikThummar India

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misoo Slovakia

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Veershetty023 India

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Bacheca pubblica per chiarimenti

Titolare del Concorso
- 5 mesi fa
Thank you every body for your ideas. But NO ONE has provided a schematic design we can build.

We have been given ideas only. Please provide a schematic with component values.
- 5 mesi fa
Titolare del Concorso
- 5 mesi fa
We already know the job can be done. We don't need ideas and suggestions. We need a working design that we can build and test. Today we have four entries. No entry shows a working complete design!
- 5 mesi fa
1. Muzafarbaloch
  - 5 mesi fa
  Sir! here you are kindly check #8 . it contains the complete working circuit design. Thanks
  - 5 mesi fa
Muzafarbaloch
- 5 mesi fa
Certainly, you can use a 74HC4040 binary counter and other basic components to create a circuit that measures the width of a TTL pulse. Sir Kindly check my entry #8 . everything is mentioned there.
- 5 mesi fa
osamaelkomy
- 5 mesi fa
I'm confused about your requirements for this contest.!
I gave you the design schematic and a simulation. The simulation confirmed that the design works perfectly with 74HCXX logic chips. What else do you need ?
- 5 mesi fa
Visualizza altri 2 messaggi
1. osamaelkomy
  - 5 mesi fa
  There are other options to replace 74HC123 that can generate the 3s pulse like 74HC4538. Does using MMV acceptable ? or you prefer counter solution ?
  - 5 mesi fa
2. osamaelkomy
  - 5 mesi fa
  Other thing about circuit behavior, when the alarm signal is activated ( if the PW > 3s), what should happen when the PW returns to normal condition (PW < 3s)? automatically deactivate the alarm, or provide manual deactivation (Reset)?
  - 5 mesi fa