Voltage Regulator
Intro: Voltage Regulator
IMPORTANT I have recently dug this out of a box and tried to regulate 9v from an RC car battery, it did work, but then there was a puff of smoke and it became extremely hot. This may be because i have previously fried the regulator, but i thought i would let you all know so you can be careful. I may need some filtering capacitors, not sure. please tell me if you have any ideas.
This is the circuit for converting a 12V car supply to 4.5V.
You will need:
2 X 2 wire PCB mounted terminal blocks (optional)
1 X diode
1 X L78S05CV voltage regulator chip
Some verro board
Some Wire
This is the circuit for converting a 12V car supply to 4.5V.
You will need:
2 X 2 wire PCB mounted terminal blocks (optional)
1 X diode
1 X L78S05CV voltage regulator chip
Some verro board
Some Wire
STEP 1: Connect the Terminal Blocks
Drill a hole to break the tracks and solder the two terminal blocks as shown in the picture.
STEP 2: Connect the Wire Jumps
Solder the jump wires in.
STEP 3: Connect the Diode
Solder the diode in over the break in the tracks.
STEP 4: Solder in the Voltage Regulator
Solder the voltage regulator in (bend it down so it's flat if space is an issue).
STEP 5: Test
Connect the power into the input end of the board. Test between the connections at the other end and it should read the voltage the chip is set for.
22 Comments
electronicsmith 4 years ago
I have only ever used www.NextPCB.com and have been Surprised with the quality i Recomend try once.
alien200049655 11 years ago
RenatoL1 6 years ago
any one between 10uf and 100uf will do the trick.
akisakaw 13 years ago
sblessley 12 years ago
AntMan232 13 years ago
sblessley 13 years ago
Short of duplicating the regulator for each output voltage, how might I deliver multiple voltages in this basic format?
AntMan232 13 years ago
Sorry
sblessley 13 years ago
Thanks again for both the "instructable" and the ideas!
jgosselin 12 years ago
carlos66ba 14 years ago
Now for some suggestions: a couple of capacitors (one across the input lines, one across the output lines) should reduce noise, if that is a problem... Please also note that this is not very strictly regulated (due to the variation of the voltage of the diode with current), but it should still work quite well for most applications (heck! it would still work quite well if you feed 5V to something expecting 4.5V, but don't blame me if it does not work, makes your device blow up in flames and takes the car with it...).
AntMan232 14 years ago
I didn't have any trouble running a picaxe project off it, and that was off a power-pack, which I would expect to have more noise as it's plugged into the mains.
And I hope the car doesn't go up in flames, Dad would KILL me!!
lemonie 14 years ago
Input V
Output V
V-regulator type
A resistor
What those grey & black spots are
Photos
L
AntMan232 14 years ago
Output V is about 5 but with a diode is about 4.5.
V-regulator is L78S05CV.
The circuit works without a resistor but please tell me where it should go and why, so I know for future.
The grey and black spots are the soldered joints, I though it would be easier to see which tracks the components were soldered to.
I haven't got any photos from while I was making it, and the soldering is a bit messy, so it wouldn't show anything anyway.
lemonie 14 years ago
These things often have other components in regulator-circuits, but it depends on the type and such.
L
frollard 14 years ago
frollard 14 years ago
AntMan232 14 years ago
frollard 14 years ago
AntMan232 14 years ago
Thanks