Dotty1313
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Posts posted by Dotty1313
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Hi all,
Can't resist to show a DIY project that I have done a few months back (after seeing so much posting on this topic);
It all started when the evaportion rate of my fish tank increases and I was pretty tired of topping up water everyday. I have it running for a few months now and it seems to work pretty well - so far no problem.
Disclaimer: The design is entirely my design - from the float switch to the electronic circuit in the controller box.
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hello... has anyone tried to make their own cooling fans with PC power supply and PC cooling Fans??
i was trying... but cant seem to get it going... understand that nowadays power supplies need motherboard to run... but i follow an online guide.. made a jumper.. connect it.. but can seem to work??
anyone tried yet and it worked??
Hi,
No need to use the PC power supply (you waste electricity since they are normally rated 250W and above). Just get a variable transformer (those that plug directly into the electric socket) and fix up a connector (can get it at Sim Lim for <$2) - do make sure that the current rating of the transformer is greater than your PC fan. Most PC fans uses 12VDC.
Regards...
Dotty
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Hi,
Does anyone know what is the power consumption of a 150WMH bulb using a 250W MH ballast fixture? Is the power consumption based on 250W even if a 150W bulb is used?
Also, does anyone know where to get the protective glass for MH - read somewhere that tempered glass can be used, can anyone confirm? any other alternatives?
Regards...
Dotty
DIY Auto-water topup
in DIY Forum
Posted
Hi,
Thanx for the interests... here's a consolidated reply to the various questions asked:
TDidn't really tallied up the cost but my estimation is that it is less than $50 (not inclusive of labour
). This is for the controller unit and the float switch.
The electronic circuit is pretty straight forward if you are familiar with electronic/electrical stuff.
For this project, I use a simple mechanical relay switch for the switching on/off of the power supply. You can also use solid-state relay if you have higher budget. I have a transformer to step down the power supplier to 12V for use by the float switch.
The logic is very simple, the float switch is normally open but will close when reach a certain level. When it is closed, it will activate the relay switch to turn on the A/C power (please get proper advice on this if you are not familiar working with 240V - this can kill!!).
The float switch is made from ballon stick (those sticks that come with balloons), compact foam, magnet and a magnetic switch. The magnetic switch will close when there is a magnetic field near to it. Well, that's all to it. Simple?
Do take note that the magnetic switch tends to get magnetised after some time - depending on the condition of the magnetic switch. I have mine running for a few months now and things are alright. My first float switch encountered this problem and ended up with over-topping;
I have yet to make any modifications to my design to cater for a second float switch that will turn off the power when it is over-topping (actually, need not a float switch, just 2 metal strips will do. Hoped this gives some info for you to proceed with your own DIY water top up and saves some $$$.
Regards...
Dotty