That was my thought too, but the OP didn't give me enough info to suggest itWhy not just use a commercial wall timer such as this to control the relay?
I want to control a motor supposed to be ON for 22 Hrs and then go to Rest for 2 Hrs. I drawn a circuit based on Ron J's Circuit Page and www.doctronics.co.uk (based on 4060B binary counter) these are Astable multi vibrator (22Hrs)and a Mono shot(2Hrs).but what i drawn is 22Hrs OFF and 2 Hrs ON. As we Power up the circuit astable multivibrator 4060B gets resetted and Relay picks up .As Pin3 (Astable Multivibrator) is initially zero triggering Monostable so 22 hrs cycle starts from a zero(falling edge pulse) ends with another falling edge pulse after 22Hrs .whereas I want 2hr Timer to start after 22Hrs.What is your application?
22 hours is a long time for a simple 555-type timer circuit.
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That was my thought too, but the OP didn't give me enough info to suggest it
I like to use computer controlled X10 modules for line powered timed applications.
No very precise timings are not needed approx 22Hrs ON and 2Hrs OFF will doDo you need the 24 hours to be precisely timed to the time of day?
Thanks for your valuable suggestion, I will remove LD5 from Pin3 Of U1A and follow the change suggested by you to invert U1A output, will report back after testing the changes.That schematic is a good example of how not to draw a schematic. Personally, I wouldn't use one of the outputs of a flip flop to drive that significant of a load.
Since you want 22 hours on and 2 hours off, you can use the unused NAND gate to invert the output of U1A and get back some noise immunity.
I have tested the circuit by inverting U1A out put and putting a NP capacitor between Pin3 4060A and Pin1 4011A .Result is that always 2Hr cycle comes first , Relay either is picked up or dropped depending whether U1A Output is inverted or not inverted Requirement is 22Hr cycle should start first.Thanks for your valuable suggestion, I will remove LD5 from Pin3 Of U1A and follow the change suggested by you to invert U1A output, will report back after testing the changes.
1) Circuit designed is based on two different ideas i.e.4060B as Astable and 4060B as monostable ,hence documentation is individually available Ron J's Circuit Page and www.doctronics.co.ukCircuit may require more modifications than I thought; I only gave it a cursory analysis...
Do you have documentation describing circuit operation? Did it tell you to AC couple the output from U2 to U1A?
Can you confirm the values of the R and C for both counters? R32+RV2=? RV1R6+=?
Thanks for the efforts you put in, I will study the circuit suggested by you and bread board it.I went to the website you referenced, and I wasn't inclined to spend time searching for the timer you're using. A link to the page with the information would have been more helpful...
I think the attached schematic is a more straightforward (IMO ) solution. It uses a single CD4060 as an hour counter, a couple flip flops (one to replace the missing Q11 output), and some AND gates to decode the number of hours:
View attachment 87404
This circuit gives you some flexibility in on/off times without having to re-tune the oscillator.
Disclaimer: I don't have any CD4060 on hand so I didn't breadboard; I don't use simulators. I've walked through the design several times and didn't notice any problems...
I have built the circuit using two 4060 counters these counters are reasonably cheaper.Circuit is working as desired. Any On Off timing can be set by changing RV2 and RV3 pots. I am uploading this circuitThanks for the efforts you put in, I will study the circuit suggested by you and bread board it.
Thanks.