i "need" an headphone amp ASAP

[No ideas]

i "need" to build a headphone amplifier and im limited to these active components, the headphones(iem's) i want to drive are the kinera celest gumiho, the issue i have with them is that theyre 8ohms and my dongle cant keep up current wise during the bass notes.

 

[rayma]

Use the LM386, since it's designed for this purpose. See the circuit in the data sheet attached (figure 9-1).
Use only the x20 gain circuit to minimize noise, with a 12V power supply.

 

[No ideas]

can i add an virtual ground circuit that uses the lm358 and power it with a 9v battery?

 

[rayma]

You don't need a virtual ground, the LM-386 just uses a single supply.
You can use a 9V battery as the single supply, see fig. 9-1 in the LM-386 data sheet.

The LM-358 is not suitable for driving your headphones, or any low impedance.

 

[No ideas]

i know i dont need a virtual ground but i also dont want an output cap i also dont need the 750mw/1w that the lm386 can provide

 

[rayma]

If you make the output capacitor big enough, it won't be a problem. Around 2200uF at 16V (or more uF) will be fine.
Otherwise you don't have any other suitable parts.

 

[No ideas]

i have bd911/912 and bd135/136 transistors that i can use along side with some small signal transistors such us bc547 and 557

 

[rayma]

Then maybe you can rig up an op amp front end with complimentary bipolar outputs.
But you'd have to design the circuit. Something along these lines, adapted for your parts.
You'd use two 9V batteries, not one.

 

[No ideas]

i can make some sort of a splitter whatever thing

 

[rayma]

A "splitter" will affect the sound more than an output capacitor.
It's a whole extra amplifier circuit, in series with the headphones.

 

[No ideas]

oh yeah so i should just go output cap on this one i think i made a simmilar thing some time ago(just the schematic)

 

[rayma]

That way you can use the TDA2822 as well.
See figure #1, https://www.st.com/resource/en/datasheet/cd00000134.pdf

 

[No ideas]

i personally have this thing which basically is the tda2822m application plus power supply and all i can say is that its trash

 

[No ideas]

noise distortion and more

 

[fubar3]

noise distortion and more

The 2822 specs less than 1% distortion. It was intended for economy audio and should be better than the LM386.
I think you could meet your goal with two 2822 in bridge mode, a battery, and a headphone jack.

 

[No ideas]

i tried this tda thing and it haves heaps of noise

 

[fubar3]

i tried this tda thing and it haves heaps of noise..

Your TDA2822 pcb should have a DIP socket so that you can check the DIP voltages before you plug in the chip. That is normal practice for these little DIY amplifiers. Also there should be a volume control pot on the PCB close to the TDA so noise pickup is minimal. It should get music from the line output of a HiFi or portable player.

You need to provide a schematic or a diagram of your gear so that people can answer questions about it. A photo is not sufficient evidence.

 

[No ideas]

well its just the application from the datasheet

 

[knauf1919]

noise distortion and more

Hi ,
What is the origin of resistors, capacitors and those other components?

 

[No ideas]

the origin is school and they are new.