Any 12V AC powered IR illuminators out there?
- Thread starter 105437
- Start date
Or this ==>> Bridgold 5pcs KBPC5010 Bridge Rectifier Diode,50A 1000V Single Phase,Full Wave 50 Amp 1000 Volt Electronic Silicon Diodes,Through Hole 4-Pin
There are some smaller and cheaper full wave bridge rectifier packs but they require soldering. This has a mounting hole and allows soldering OR slip-on lugs. $9 for 5 pieces, too.
Just apply your 12VAC across the "AC" tabs and out comes the 12VDC on the positive "+" and the negative "-" tabs.
EDIT: In my haste I left out some important information. This bridge performs no regulation, only rectifying so more components are required on it's DC output. Thanks to @Mark_M for reminding me. It seems that 20 years of retirement has taken a toll on my gray matter..
There are some smaller and cheaper full wave bridge rectifier packs but they require soldering. This has a mounting hole and allows soldering OR slip-on lugs. $9 for 5 pieces, too.
Just apply your 12VAC across the "AC" tabs and out comes the 12VDC on the positive "+" and the negative "-" tabs.
EDIT: In my haste I left out some important information. This bridge performs no regulation, only rectifying so more components are required on it's DC output. Thanks to @Mark_M for reminding me. It seems that 20 years of retirement has taken a toll on my gray matter..
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I assume one of these would work to convert AC back to DC for some of the doorbell cams that require DC?
My neighbor didn't want to change out his transformer because when he moves he plans to put a doorbell back.
How about a 24 V AC to 12 V D/C..
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It should rectify incoming AC to DC out, so yes.
It performs no regulation, only rectifying.
Mark_M
Getting comfortable
A bridge rectifier isn't truly DC.... it needs some electrolytic capacitors on the output.
and you beat me to it
.Example of a power supply using such a bridge rectifier, the capacitor is in parallel.
Here's the AC waveform of 12v RMS (16.97 peak-peak). Frequency is different for ease of viewing the graph.
If you put that through a bridge rectifier it just allows the positive half of the sinewave to come through. The voltage between the two output terminals is still fluctuating between 0v and peak voltage.
With a capacitor in parallel to your full-bridge rectifier, the output is smoothed a lot more but will still experience some voltage ripple.
Secondary of your AC transformer current is roughly 1.8 times current on the DC output (1.8 * I_dc.)
An IR spot light should handle some ripple fine..... more sensitive loads should have better regulation. You can buy buck-stepdown modules or linear voltage regulators for this.
Enough with equations..... LOL.
Yessir, I did....." It performs no regulation, only rectifying."and you beat me to it
@DsineR 's suggestion fits the bill, as the OP probably wants plug n' play.
Gimmons
Getting comfortable
I have a dc led strip light running off the 12v ac my landscape lights use. A simple bridge rectifier does the job. The strip light was cheap, so I wasn't afraid to try it without a regulator.
Generally, in such an application you might get some flicker from the LED's due to no filter capacitor and/or no regulation but I would think it's no big deal, it's not like you are trying to use it to read by so some flicker is tolerable.
Gimmons
Getting comfortable
For whatever reason, maybe a bunch of leds in the strip has some capacitance, I see no flicker. Or maybe 60 cycles per second is faster than I can see it.