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As for the oscillator, the slowest crystal I could find is 32 KHz which is too fast for me.

General directions for a timer circuit which will not use microcontroller and which can measure several hours needed Ask Question. Due to the input current on bipolar timers, they cannot be used with such large resistors, similar to how you cannot use high valued resistors with bipolar op-amps. My first idea is to create or find prefabricated some sort of counter which would be connected to a slow oscillator.

Then use a counter using the 1Hz pulses as clk and use it to count the seconds. Post as a guest Name.


Even within the guaranteed ranges, consider normally foreseeable. I had the PLC around from another project. IT takes v AC as an input and provides a 24v DC output for driving relays or switch lights in this case. I’ll be really very grateful. PDF generated using the open source mwlib toolkit. Thank you very much. Products conform to specifications per the terms of Texas Instruments standard warranty.


This product is not designed to be radiation resistant.

Some TTL logic parts were made with an extended military- specification I thought about using capacitor and coil to make my own oscillator. Have a datashwet at basing your circuit around a CMOS stage ripple counter and oscillator. Sign up using Email and Password. Confirm that you have.

Design your application so that the product is used within the ranges guaranteed by Hitachi particularly. I know that a book can be written for every point, but at this moment I’m just looking for some rough ideas. I dahasheet the best solution is to use CD with a crystal oscillator which can produced 1Hz pulses.

Great thanks in advance! In general I have found that using a “complex” circuit of discrete components is usually plagued with minor errors in both design and construction that cause them to take a lot of time and money. They are edge-triggered, synchronously presettable, and cascadable MSIbuilding blocks for counting, memory addressing,frequency division and otherapplications.


Set the off time on the timer as close to the start time to release the relay.

74LS162 (16PIN)

No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without. List of series integrated circuits – Wikipedia ; The following is a list of series digital logic integrated circuits.

Hitachi bears no responsibility for failure or damage when used. At least it will work in the presence of a Tesla coil while being tapped by a hammer or the washer’s spin cycle.

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Tokyo 03 Fax: No need datawheet undercomplicate things just because you are using an off-the-shelf long delay timer.

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