12v trigger to USB fan

[Agapetos]

Hey everyone.

So, my arcam runs hot, not necessarily the amp heatsink, but the HDMI switchboard.

I headed a small USB fan inside to create some air circulation, as in my opinion the avr11 has design issues which I'm not gonna get into.

The USB on the back of the AVR is always on. With that I mean standby mode it's still powered.

I have looked high and low but haven't found what I hoped.....

A 12v trigger controlled USB power supply....or a USB passthrough that is controlled by the 12v trigger....

There's no USB settings on the arcam that I could find anywhere, but it would be ideal if the fan just shuts off when I turn it off

I guess I could solder it straight to a 5v output inside the AVR but I'd rather not risk any warranty issues.

Thanks if anyone has any idea how to control my fan the smartest way

Edit: the avr11 went into fault protection 4 times over 2 days. Even with the infinity on auto , the last day. I'm raising up the AVR as there's not much airflow underneath. Also, where the top air vents are located is way off set from where the infinity intake is...when I pushed the AVR with lots of power on music it still was pretty cool...when watching 4k movies that's where the heat is really kicking in.

 

[ta240]

I don't know if it would work for your use but, I use one of these on the fan for cooling my AVR.

CONTROLLER 1, Pre-Set Thermal Trigger, for USB Fans and Devices

Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.

acinfinity.com

 

[Dunring]

On AliExpress they have a big variety of USB fans which could just turn on when it powers up. Having one blowing across the hot area would just use a trickle of power even if it's on all the time. I'd just keep it simple and get a small, free standing USB fan, even Amazon would have a ton to pick from.

 

[Agapetos]

On AliExpress they have a big variety of USB fans which could just turn on when it powers up. Having one blowing across the hot area would just use a trickle of power even if it's on all the time. I'd just keep it simple and get a small, free standing USB fan, even Amazon would have a ton to pick from.

Yeah, ideally I wanted it to turn off, but I have it on low right now, it's inside the AVR not my cabinet. With the infinity on top I can't hear it, and if I play music and movies, obviously it's not an issue.

I just found a relay power supply that can be used with the 12v trigger, with a minor modification, might try that just for kicks

 

[Agapetos]

I don't know if it would work for your use but, I use one of these on the fan for cooling my AVR.

CONTROLLER 1, Pre-Set Thermal Trigger, for USB Fans and Devices

Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.

acinfinity.com

Thanks, I got all kinds of sensors and fans, but just really wanted it on when AVR is on, all the time, but it would work.

Was thinking that power amps with trigger in and out easily could add a USB port to come on when it's triggered and voila problem solved.....a lot of people have asked this question and I have no idea why nobody has made a USB fan supply with a 12v trigger....

 

[DonR]

Get a cheap 12v relay module from Ali or ebay and wire up a USB cable to it.

 

[Agapetos]

If anyone is on the hunt for powering devices other than the usual power amps here's a power strip that does exactly that: Iot Relay - Enclosed High-Power Power Relay for Arduino, Raspberry Pi, PIC or WiFi, Relay Shield https://a.co/d/ccqFjWH

It requires at least 100mA to trigger, and the arcam avr11 is only 70mA but I got some emotiva amps which is 120mA on the triggers, so that would work.

Seems like people use these to trigger on older amps that doesn't have the 12v trigger build in.

 

[Agapetos]

Get a cheap 12v relay module from Ali or ebay and wire up a USB cable to it.

Yeah I saw those, would be fun to do, but the triggered power strip can be much more versatile so I went for that, thank you!

 

[Devnull]

I'm a little late to the party but a 12V trigger should be able to power a 12V fan directly.

 

[Vladetz]

I can buy dc-dc solid state relay and put power to fan from usb through it

https://aliexpress.ru/item/1005004109696219.html?spm=a2g0o.order_list.order_list_main.295.21efa396EyIuNq&gatewayAdapt=glo2rus&sku_id=12000029779325304

I am using this relay to power up Arctic P12 fan (from external 5v source) cooling Topping PA7 amp. It activates from 12v trigger signal from Topping E70 Velvet

 

[Vladetz]

I'm a little late to the party but a 12V trigger should be able to power a 12V fan directly.

It may not be a good idea because trigger output is not designed to supply enough current

 

[DonH56]

As an aside: I would never use the 12 V trigger output to directly power a fan. I have seen trigger outputs rated from ~25 mA to ~150 mA, rarely enough for a fan. A fan motor also exhibits high turn-on current surge, and high voltage spikes on turn-off, which can harm a trigger output. There are several reports of people plugging in a fan and blowing their trigger outputs. I have used X10 modules to power fans (and amps), as well as inexpensive IR relay modules (like this one: https://www.amazon.com/gp/product/B07QH6XP9P/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 ) to control devices via a trigger. I have also picked up or made simple trigger repeaters to provide additional outputs without loading the AVR/AVP, such as the Emotiva ET-3 (https://emotiva.com/products/et-3).

 

[Devnull]

Vladetz and DonH56 make good points. The engineering due diligence is up to the end user. In my specific case my AVR has 3 independent 12V 150mA trigger outs and the fan I chose was IIRC 50mA startup and 25mA running so not an issue. I've never specifically measured the LRA for a worst case scenario but that's a chance I'm willing to take. I'll take the benefits extra cooling over the potential downsides of having the extra fan.

 

[DonH56]

Vladetz and DonH56 make good points. The engineering due diligence is up to the end user. In my specific case my AVR has 3 independent 12V 150mA trigger outs and the fan I chose was IIRC 50mA startup and 25mA running so not an issue. I've never specifically measured the LRA for a worst case scenario but that's a chance I'm willing to take. I'll take the benefits extra cooling over the potential downsides of having the extra fan.

There are a couple of things I would do attaching a fan to the trigger output, that may or may not be required:

1. Add a current-limiting resistor in series with the fan just in case the motor demands a surge greater than the trigger canhandle (that can happen at start-up or if for example the fan stops for any reason); and,

2. Add diodes to clamp any surge voltages, e.g. a Schottky to prevent dips below ground, and a Zener (maybe 14~15 V) to clamp any spikes well above 12 V.

 

[Kimbrough Xu]

Thanks, I got all kinds of sensors and fans, but just really wanted it on when AVR is on, all the time, but it would work.

Was thinking that power amps with trigger in and out easily could add a USB port to come on when it's triggered and voila problem solved.....a lot of people have asked this question and I have no idea why nobody has made a USB fan supply with a 12v trigger....

It has sensors, then you dont need a 12V trigger.