This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, February 13, 2018

1 Watt Mini Amp

Here's a nice little solid state amp for headphone use or a small 4Ω speaker. Good candidate for a bench top amp for testing purposes. You can board mount the pot and it will fit in a 1590A just fine.


  1. This is rad. I don’t have any TDA7052A’s. And they are a little obsolete, or I didn’t find them easily from my favorite sources. I did find a number of them on eBay. I was also unable to find a direct replacement. So, it’s to eBay if anyone needs IC’s.

    I think I’ll add this to a Wampler Tweed 57 and try and make a little solid state tweed headphone amp.

  2. What do you think is this better than the ROG Ruby?

  3. Replies
    1. You can use it with 8 ohm load, since it's a typical working condition, according to 7052A datasheet.
      I'm not quite sure why author says output is rated for 4 ohm load.

    2. Cuz it's what the schematic said. I didn't look at the chip's datasheet :D lol

    3. Oh, I'm not blaming you, kind sir. I was talking about schematics' author.

  4. Hi! Simple and nice sounding! But it works without power connection to the D of the transistor. Its normall?

    1. That's weird... The JFET is an input buffer, so it would work (just not as well) without it.

  5. i put a jumper instead of G and S of the transistor and it works too. :O

  6. Which component do I have to change to use a larger speaker?

  7. Verified!
    I used a 8 ohm 2w speaker, and a stereo jack with a switch to use the headphones and cut the speaker.
    The sound is very transparent and defined, when using other mini amps like the ruby or the MXR could not notice great difference in the sound of the guitar when using the pot of the tone, with this, it is noticed all the variations of tone, and the selection of the pickups with great detail.
    I will abandon the MXR and start using this.
    Thanks for your dedication and talent to this site, I hope you continue for a long time!

  8. Hey. Built it acc. to layout. Got two things happenening.
    1- the signal is getting distorted but like two signals together, one clean signal and the other is the fuzz added signal.
    2- the ic is heating like a barbeque... is that smth to be expected ?

  9. How would this work with a celestion greenback, 25w speaker?