Headphone Amplifier

[PedalPCB]

Headphone Amplifier

Drill Template - Revision 1
Drill Template - Revision 2

 

[Nic]

Thank you Robert!

 

[geoffrey]

@Robert Do the "L" and "R" pads for the Stereo jack output stand for Left and Right? Other than the sleeve, how do I know which is which ?

Sorry, I don't know this terminology (I'm used to tip, sleeve, ring)

 

[Bricksnbeatles]

@Robert Do the "L" and "R" pads for the Stereo jack output stand for Left and Right? Other than the sleeve, how do I know which is which ?

Sorry, I don't know this terminology (I'm used to tip, sleeve, ring)

Yes— left and right. The most common configuration for headphones is Tip=Left, Ring=Right

 

[Robert]

It's somewhat arbitrary in this case since it's Mono->Stereo.

The only significance is which side is affected by the phase shift in "Spread" mode.

 

[geoffrey]

Thanks, gentlemen!

 

[notTHEwillienelson]

It's somewhat arbitrary in this case since it's Mono->Stereo.

The only significance is which side is affected by the phase shift in "Spread" mode.

Would it handle the XLR output of something like the Fender Tonemaster Deluxe Reverb, which has an output volume control?

 

[yerblues]

It's somewhat arbitrary in this case since it's Mono->Stereo.

The only significance is which side is affected by the phase shift in "Spread" mode.

yo, I was wondering if you knew how to go about adding an aux input to this circuit? would it just be a matter of wiring another jack to the headphone out jack? would I have to add resistors somehow?

 

[Bumfluff101]

Hi do you the schematic for this one?

 

[temol]

yo, I was wondering if you knew how to go about adding an aux input to this circuit? would it just be a matter of wiring another jack to the headphone out jack? would I have to add resistors somehow?

Here's an example - check the schematic https://www.electrosmash.com/1wamp
To make it stereo - just split the 22k resistors, add another 100n cap.

Hi do you the schematic for this one?

Post #12

https://forum.pedalpcb.com/threads/balanced-effect-line-level-and-spread.22986/

 

[benny_profane]

yo, I was wondering if you knew how to go about adding an aux input to this circuit? would it just be a matter of wiring another jack to the headphone out jack? would I have to add resistors somehow?

Attached is a vero layout for a daughterboard I've used in the past. The pot (100k) is an input trim adjustment and can be internal or external depending on your application.

EDIT: IN is taken from the main instrument circuit path, the TRS connections are for the AUX input, and OUT goes to the input of the headphone amp circuit.

Cuts/links:

Components:

 

[jkjkjk]

@benny_profane thanks for sharing this aux input daughterboard! Quick question, what orientation are the 100uf and the 10uf capacitors? And am I right in reading that the 0.1uf and 100nf capacitors are the same value?

 

[jkjkjk]

It's faint in the color shading, but I think it is the 100uf with the negative pointed down on the layout, and the 10uf pointed up on the layout. But correct me if I'm wrong, thank you!

 

[Nostradoomus]

It's faint in the color shading, but I think it is the 100uf with the negative pointed down on the layout, and the 10uf pointed up on the layout. But correct me if I'm wrong, thank you!

Looks that way to me. And .1uf and 100nf should be the same, but the yellow cap makes me suspect it may be mistakenly labeled 100pf.

 

[jkjkjk]

@Nostradoomus - thanks. Are you saying that the one labeled 100nf might actually be a 100pf?