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Please help with 12v LED flasher w/ sound

Starbase101

New Member
I would like to build a flasher circuit that powers three 12v high-brightness LED puck lights (hence the 12v), and a 4th LED light which doesn't need to be as bright as the first 3 but flashes on the same circuit. This will be powered by a 12v DC wall adapter and tuned to synchronize with a looped sound file. The full project entails:

- 1 push-button switch which turns on a white LED and plays a short sound clip. The LED remains on until the button is pressed again.

- 1 push-button switch which initiates the LED puck lights flashing timed to a repeating sound clip. The flasher and sound remain on until the button is pressed again.

I bought an Adafruit Audio FX Mini Sound Board (2342) with their 3.7W Class D Audio Amplifier (987) and 3" Diameter 8 Ohm 1 Watt Speaker (1313) which should be fine for handling the sound portion of this project (a voltage regulator should be able to send 5v to the Adafruit boards from the 12v supply). There is a 12v flasher board by Velleman (Jameco #2265311) but the pulse/pause interval range are too high for my sound loop. I have not bought any of the LED lights or AC/DC adapter yet because they're available in different power ratings and I need to be sure of everything being compatible.

Could somebody please collaborate with me on this? Thanks!
 

eTech

Well-Known Member
We Need:

LED part number/specs.
Flash rate(s).
Flasher trigger signal requirements
Power supply requirements (12v ?)

"- 1 push-button switch which initiates the LED puck lights flashing timed to a repeating sound clip. The flasher and sound remain on until the button is pressed again. "
Please clarify "flashing timed to a repeating sound clip".
 

Starbase101

New Member
I said, the LEDs aren't bought yet because there are a variety available and I don't want to get something that won't work with the circuit's power output. The flash rate is roughly 1s pulse with 1s pause. The power supply will be whatever is needed to power the 4 lights.
 

eTech

Well-Known Member
I said, the LEDs aren't bought yet because there are a variety available and I don't want to get something that won't work with the circuit's power output. The flash rate is roughly 1s pulse with 1s pause. The power supply will be whatever is needed to power the 4 lights.
Yes, but you will have to provide a target LED spec, otherwise a flasher/driver can't be designed.
 

Starbase101

New Member
Okay, I thought it would be the other way around - LEDs being selected to a target flasher current rating, since there are a lot of variety with light options. So quick question, will a 12v 2A ACDC adapter power multiple 2A lights in parallel (not continuous on - 1sec on, 1sec off) or is the load cumulative for all the lights on the load? (I'll need to choose a compatible LED and wall adapter combination.) 12v adapters are available in mA, 1A, 2A, 3A etc power ratings.
 

Starbase101

New Member
So, how about this configuration?

1x https://www.adafruit.com/product/2342 (for playing the sounds, will need 5v from the 12v supply)
1x https://www.adafruit.com/product/987 (for driving the speaker, will need 5v from the 12v supply)
1x https://www.adafruit.com/product/1313 (only one speaker is needed)
3x (flashing) https://www.cabinetparts.com/p/task...ture-led-cabinet-lighting-HRLUTFR3SN50-p64433
1x (flashing) https://www.adafruit.com/product/1621
or https://www.wiredco.com/LED-Lighting-Panel-Board-SMT-SMD-Cool-White-Adapte-p/letcoolwhite.htm
or https://www.newegg.com/p/2A7-00BD-00AW4
1x (non-flashing) regular 5mm white LED

If it helps any, I've also got a https://www.adafruit.com/product/3677 which might be usable for controlling the LED timing, but doesn't output enough power to drive the 12v lights. Or maybe I could use https://www.jameco.com/z/MK111-Velleman-Adjustable-Interval-Timer-Kit_2265311.html and change the pause potentiometer to enable a 1sec pause instead of the 2.5sec built-in lower limit, but this timer kit seems like it too would need drivers for the lights.
 
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ChrisP58

Well-Known Member
Most Helpful Member
Okay, I thought it would be the other way around - LEDs being selected to a target flasher current rating, since there are a lot of variety with light options. So quick question, will a 12v 2A ACDC adapter power multiple 2A lights in parallel (not continuous on - 1sec on, 1sec off) or is the load cumulative for all the lights on the load? (I'll need to choose a compatible LED and wall adapter combination.) 12v adapters are available in mA, 1A, 2A, 3A etc power ratings.
Current adds when you put loads in parallel. If each of three LEDs requires 2 amps, then the current needed from the supply will be 6 Amps minimum. It's OK if the supply has the capacity to deliver more current, as long as the voltage is correct. And, whatever you are using to control that current, needs to be able to handle 6 (or more) amps.

If you connect the LEDs in series, then the voltage adds and the current doesn't. So 3 2Amp 12 Volt LEDs would need 2 Amps at 36 Volts.
 

Starbase101

New Member
So it seems each LED puck light will require its own separate power supply adapter. Now the challenge is being able to flash them all at 1sec intervals without using a relay (I don't want a "clicking" sound while they flash).
 

ChrisP58

Well-Known Member
Most Helpful Member
So it seems each LED puck light will require its own separate power supply adapter. Now the challenge is being able to flash them all at 1sec intervals without using a relay (I don't want a "clicking" sound while they flash).
I can't think of any inherent reason that they would need to be separate.

12 Volt supplies are readily available with enough current to handle multiples of your puck lights. And it will be easier to control them in unison if they are all powered from the same supply.
 

Starbase101

New Member
I've switched to plug-in LED lights (https://www.lowes.com/pd/Enbrighten-3-Pack-2-75-in-Plug-In-Puck-Light/1001312690) because they're much brighter and I've found an AC flasher (https://www.trafficlights.com/flashers/afn3-alternating-flasher) that can be wired between the lights and power source. I also got a Wi-Fi switch (https://www.lowes.com/pd/Enbrighten-Cabinet-Lighting-Master-Switch/1003263736) which also includes a push-button for placement between the flasher and power source, and will use a 5v AC/DC adapter to power the Adafruit sound board and speaker amplifier.
 
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