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In the circuit, the relay should connect directly to 12V supply, because 4060B CMOS binary counter can only source out 6mA. refer this datasheethttp://focus.ti.com/lit/ds/symlink/cd4060b.pdf
As for for the 547b transistor, it can only supply 100mA so your relay should draw less then 100mA.http://www.datasheetcatalog.org/datasheet/mcc/548B.pdf
So if I connect the Relay directly to the power source, how do i ensure it only triggers at the end of 20mins?
So what value of should I be looking at?
4.1 be patient.people post here for fun. if you want to remind people about your topic after a suitable period of time that is fine (and sometimes recommended, it's easy to forget about that post you meant to reply to...) but try to include an update on any progress you have made or other things you have tried since the first post.simply posting "really i need help!!!!!!" six hours after your first post with no additional information is just rude.
Considering that relays are mechanical and may fail anytime
When I tested thow much current is flowing - its a mere 4Volts plus - so think the 555 is draining all the power from the battery when it comes up.
I called my local (Abuja, Africa) store and they dont have the CMos 4093 - looked it up on Radioshaks site too without luck.
So I guess I might need to wait for you to finalize the 555 one.
You wanted to know what relay I was using... its a SMV 12 C with 6 contacts (8 pins) rated 5A 240V, I also bought a smaller 6Volts one with 2 contacts (5 pins).
Thanks Bro! this must have taken a long long time to put together.
Hey! I finally got the components, and soldered them - except for the 10nan cap, Couldn’t find one so I used a 15nano cap - see attachment.
Everything worked well, I tested each weld as I soldered -
when I connected it up to the Battery, the RED led flashes, and I can adjust the cycle time (the led is an indicator of the timing) - but nothing seems tp happen at the other end. Pin 3 starts high - but the relay does not charge. I left it on for a long long time (I slept off after about an hour) to see is the relay will come on, but it didn’t.My question now is what should I expect? have I done something wrong? Is the 10 -15 nano disparity too wide for the right effect?
However, after putting the relay together, I noticed another problem. the relay remains charged long after 30 seconds - I realised that after 30 seconds, IC2 only drops the voltage from 11.78Volts to about 5.54Volts. I guess this is still enough to keep the relay energised.
New questions now are; Is there a way to cut it (or reduce it such that would not charge the relay) off altogether after 30secs?
Could this be becourse I used a secondary relay (I am driving a motor with this circuit) thst shares the same power source with the timer?