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I got this standard 24 hour timer (230V), with 15 minute increments
I want to bend the circuit in such a way that the timer will become a 3 hour timer, basically it will spin faster. Could I change the resistor to achieve this? What value should the resistor be?
No, you cannot. The motor running the timer works off the frequency of the AC power, in Hertz, as in 60 Hz. You would need the supply power to be at 480 hz. Unless you build your own power generator to run at 480 hz, you are SOL.
If you move to England you can run it on their 50hz and have a 27 hour timer! (kidding, the 240 V would blow it up)
Buy an incremental timer (digital) designed for the purpose.
***EDIT*** Looks like you may be already on 240V 50 HZ. In that case, reverse the sarcastic stuff I said above and plan on moving to Canada. You would get a 22 hour timer.
I had the suspicion that the rotation speed has to do with the frequency
I have not seen a digi incremental timer in the stores around here
And the problem with regular digital timers is that they have like 8 or 10 (on/off) programs and that's it, I can't program a on/off sequence (on 2min/off 2 min) to run continuously.
...or I could mess with the gears in the mechanism, but that will probably be very difficult
What task are you trying to accomplish with this timer?
BTW, those resistors there are to bring the line voltage down to a level for that small motor to operate, otherwise it would burn out the coil. Cheaper than putting a motor in designed for line. Not enough room, either.
actually there is a way but you would waiste a few digital timers up to you and equal mobile chargers... depends how desperate you are
have a multi plug socket with 3 digital timers .... each have the time set the same ... then a mobile plug in each running to 1 junction box that leads to the fans
if 1 timer has 8 programmes and you set the digital to when the lights com on and off a couple minutes later then again 10 minutes lter same again till the end of the programmes the the next timer carry on then again
you can add your programmes by 8 each time you add a timer
hahahaha it will work coz its DC not AC ... in fact ac will work to lol
thats a fuck load of timers though .... BUT IT IS POSSIBLE!
there is a way i just opened one up .... (if it doesnt work you've waisted a timer ..be warned!)you see the group of cogs top left ... you need to swoop 2 cogs somewhere firstly you need a soldering iron ... remove the cog box ... remeber where the wires go ...
infact i wont let you do it ... im a geek when it comes to changing thing that arnt meant to be changed ... i'll make it a my weakly task to modify it .. and come back with the way ..laterz
I've decided to let the fans run nonstop while the lights are on (12hr) and in 15 min increments while the lights stay off. To much hassle with these timers....
I've left the growbox open, the strains I'm groin don't seem to stink much, well at least for now. The RH does not go above 35%, sometimes it even drops to 20%.