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Even within the guaranteed ranges, consider normally foreseeable. Who is online Users browsing this forum: I’m thinking that the button 47ls162 be replaced by a transistor or some sort of normally off relay.

74LS162 Datasheet

Some TTL logic parts were made with an extended military- specification General directions for a timer circuit which will not use microcontroller and which can measure several hours needed Ask Question. Anyway that’s not datasheet the problematic part for me. Yah, I know, it’s kinda funny. Home Questions Tags Users Unanswered.

PDF generated using the open source mwlib toolkit. I didn’t think too much about power supply, but I’d either use “wall-wart” adapter or check the insides of the washing machine for any available power sources.

74LS datasheet & applicatoin notes – Datasheet Archive

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Actually the Chip itself can drift with temperature.


One of my friends needs a new laundry washing machine, so I went browsing with her. If I datassheet you I would consider repurposing a kitchen timer or an alarm clock. JeffV 1 5 In 74LS’s datasheet under minimum frequency it says 25MHz if I’m reading it right, so I guess that it doesn’t fit my needs, but 74LS has 0 as minimal frequency so it looks like a logical choice to me. Set the off time on the timer as close to the start time to release the relay. Discrete logic gates, 74ls612 or anything else which doesn’t need a programmer is acceptable for me.

Some background info first: Sign up or log in Sign up using Google. It was interesting to program with ladder logic too.

In my country, price of electricity depends among other things on the time of the day when energy is used. The resistors and capacitors use to set the frequency are not all that accurate, and they drift with temperature. I was thinking of using one of those solderable protoboards for basic circuit board. I know that a microcontroller is the most elegant solution, but I’d rather skip collecting necessary gear for working with them at this time.


Hitachi bears no responsibility for failure or damage when used. Products and product specifications may be subject to change without notice. Ecoflair Technical Specifications Provides detailed information on unit Are there any special considerations for circuits which are going to vibrate? Email Required, but never shown. This product is not designed to be radiation resistant.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Download, Click to view. Sign up using Email and Password. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly. In general, a Quasi-Resonant Converter QRC shows lower EMI and higher power conversion efficiency compared to conventional hard-switched converter with a fixed switching frequency.