Potato Cakes

Hello, everyone,

I'm working on a small mixer prototype to be used in conjunction with live in ear monitoring systems and the next revision I do needs to have a headphone amp. Right now the unit runs off of single ended +24V rail so to make things easier I would like the headphone amp to do the same or require less voltage. I have seen some Chinese made boards for sale on eBay and other Alibaba type sites, but I wanted to check here first to see if anyone had a recommendation or were selling a board themselves that would fit within the required parameters.

Thanks!

Paul


Potato Cakes

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #1 on: April 03, 2019, 04:46:41 PM »
Found these in the meantime to get me going:

http://electronics-diy.com/product_details.php?pid=760&name=Audiophile%20Headphone%20Amplifier%20Kit

I think Ian Thompson recommended these guys a while back for some of the handy DIY testing circuits they offer.

Thanks!

Paul

ruffrecords

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #2 on: April 04, 2019, 04:59:57 AM »
I don't recall ever recommending these people. But I have recommended JLM in the past for there miscellaneous kits:

https://www.jlmaudio.com/shop/index.php?display_tax_prices=1

Edit: and they do a headphone amp kit/PCB:

https://www.jlmaudio.com/shop/headphone-amp-kit.html?display_tax_prices=1

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Potato Cakes

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #3 on: April 04, 2019, 10:03:53 AM »
My apologies, Ian. I was pretty certain you had mentioned these guys regarding their test DIY stuff. Now I need to find that post and solve this mystery.

I do use a number of Joe's products and have had the pleasure of meeting him when I was in Brisbane years back and did consider his headphone amp, but I was wanting a circuit that was single ended to more easily work with the PSU being used.

Thanks!

Paul

ruffrecords

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #4 on: April 05, 2019, 03:17:11 AM »
The one you originally linked to uses a regular dual rail op amp but is also uses a rail splitter chip so it can work off a single rail. Maybe you could use that with the JLM?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Rob Flinn

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #5 on: April 05, 2019, 05:10:52 AM »
The one you originally linked to uses a regular dual rail op amp but is also uses a rail splitter chip so it can work off a single rail. Maybe you could use that with the JLM?

Cheers

Ian

Looking at the JLM documentation it appears that the board has a fcaility to add zeners to split the supply anyway.  It also seems to run on as low as + &- 12v.  Therefore relatively easy to run off a single ended 24v supply.
regards Rob

JMFahey

Re: Recommendations for single ended 24V headphone amp PCB/schematic
« Reply #6 on: April 11, 2019, 08:54:25 AM »
I bet the datasheet suggested TDA2030 single supply circuit will work fine for driving headphones, any impedance, and will be *happy* with a single +24V supply rail.
Design - Make - Service Audio Equipment since 1969.


 

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