Headphone amp for QUAD 405 amp

[chlowden]

Patrick
Your proposal is extremely interesting, thank you for sharing. I will check if the ground is common .
Many thanks

 

[EUVL]

You do not need thik wires. 22AWG is fine.
You only need to go thicker if the wire is long and you want some stiffness.
Wire, PTFE Jacket, 22 AWG Stranded, Silver-Plated Copper, White

Gold plated 4mm banana is also perfect.
It is only a few mA afterall.


Patrick

 

[Andersonix]

What's in the box?

Anybody can make this converter. Mine is based on Rod Elliot's Project 100:

Project 100

 

[Andersonix]

For noephytes like me, below is an explanation of the issues with this amps and headphones

DIY Audio Electronics from Zynsonix.com: Speaker Amp to Headphone Cable

Sorry there's NO explanation there and only a sure-fire way to immediately blow up your headphones....

Here's some good explanations, too:
Power amp adapter | DIY-Audio-Heaven

 

[chlowden]

Thank you so much for the link above.
I have nothing so much choice.

 

[Willy!]

Hello everyone,

I have been reading this thread and getting a lot of useful info. I am currently trying to build a speaker/headphones switch from quad 405 speaker output. Speakers are Celestion 66, 4 to 8 ohm.
I would like to power my Hifiman HE400i (2016 edition, planar) which have the following specs:
Impedance : 45 ohm
Max power rating : 2W
Max voltage: 9V
Efficiency : 93dB/mW , 106dB/V

The only thing I'm not sure is the value of the resistors needed for my circuit. How to calculate for this particular pair of headphones?

Thanks !!
W