Reducing voltage from a supply | |
| Author | Message | |
shortywes40
1 | Hey guys i am really new to electricity and i am trying to heat a window screen without burning it and i am using an industrial battery charger this screen will be used to separate chemicals. when i hook the charger up it works for a sec then clicks off. i have capacitors and resistors but i do not know how to hook them up. could you please help me this is a matter of pride since my friend said i would never figure it out. |
liljay22776
3 | Kevin, you could place a resistor in series with, and a ZENER DIODE in parallel with the thermometer. A properly sized zener will allow only a set amount of voltage drop, and the voltage drop will be the same across THE BRANCHES AFTER THE SERIES RESISTOR. Now it is good practice to place a resistor in series with the zener to divide the current, so you do not burn up the zener. Hope this helps some, I could go really in depth but that would take too long. |
ED LIPTON
1 | Hey Kevin, I am an OLD, really OLD Ex-plumber and a newbee to electronics so my way is probly wrong but I am trying how to reduce produced voltage also but from a HV stand point, "trying tostand on the edge death and not fall I quess" I really like tjis stuff!!
Any way I found that if you go to semiconductor MFG's and download there PDF's on there parts they give you application schems on some of them,
Go to fairchild or Texas Instruments and look up the 78XX series or the LM 317 regulators To small for what I am attempting but if anyone out there can help me I would probily live longer Thanks Ed |
seangerreyn
2 | im new
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maehndra
1 | can any body let me know why ther dropper diodes ae used for droppping the voltage intead of that resistors can also be used. keep in viw that low value resistors are hard to manufacture. and there would be problem of heat dissipation. what can be other rason for using the diodes as dropper please let me know
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kevinwilson
1 | Hello,
I'm an absolute beginner, so I'm hoping somebody can help me with this basic question.
I have built a simple circuit (from instructions I found at http://www.heatsink-guide.com/content.php?content=control.shtml) which controls a small cooling fan, using a thermistor to maintain a constant temperature.
I'd now like to take a cheap LCD digital thermometer which I bought a while ago, and build it in to the same enclosure.
The digital thermometer runs from a single 1.5V battery, so I need to know how to connect it up to the 12V DC supply which is powering the fan controller circuit. Apart from that, the thermometer and the controller circuit will be completely separate.
After a bit of searching, I think I might need to use two resistors in series (a voltage divider?). I don't really understand how this works - would I need to know the current that the thermometer draws? Is there a better way of reducing the voltage?
If anybody could help I'd be very grateful.
Thanks,
Kevin |
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